Connection from IP address 3.214.184.124
Time: 2019 Dec 09 7:42:42
Found 2376 logbook entries, displaying most recent 100

Logbook Contents (Most Recent Entries)

06 Dec 2019 Friday 12:24 [Devon] Cesium sputter source cleaned. Cs reservoir not installed waiting till January to load with Cs due to numerous scheduled power outages. Replaced the lexan air lock window with a modified design, 4 small thru holes instead of 8 counter bore and tapped holes. The pair of cathode sheaths had developed jagged leading edges over years of sputtering. A pair of old 3/8 sheaths were modified to the 1/2" design. Should be good on sheaths for a number of years.

03 Dec 2019 Tuesday 04:43 [Devon] Fire alarm in the small target room at 4:00 am. Smell of burned electrical but can't find the source at this time, will have to be on the look out for something that doesn't work. VESDA back to normal in room. The fire panel developed an error on reset, doesn't recognize the vault zone, giving trouble alarms, need Life Safety in the morning

26 Nov 2019 Tuesday 10:14 [Devon] Reminder: There is a significant power outage scheduled to occur overnight. I'll have beam line vacuum systems shut down by 2 pm today.

23 Nov 2019 Saturday 12:06 [Devon] The old O2 sensor that was temporarily installed while waiting for a new one chose Saturday to crap out. New sensor had arrived and is installed. Was waiting for Life Safety to give me access and training to disable the buzzer and dialer in the fire panel for VESDA maintenance, was supposed to be yesterday but nothing from them.

18 Nov 2019 Monday 12:53 [Devon] Had to install and calibrate one of the O2 sensors that was replaced in may. The "new" one that was 2 years old quit functioning. The distributer has replaced it with a new one (DOM 8/19) under warranty. Will install it when time permits...

12 Nov 2019 Tuesday 09:54 [Devon] Trouble with the ECO O2 sensors. Got a gas out of range warning on the sensor that was 2 years old when purchased. Xtralis insisted it would be fine. Found it reporting 37% O2. Did calibration, zero gas reading 17% before calibrating to 0. Span calibration wouldn't hold, kept rising to 23%. Airflow was 78, normalized it 100. Redid the span, seems to be creeping up again, will monitor. The other sensor was due for calibration in 2 weeks, did it, no problems.

23 Oct 2019 Wednesday 11:00 [Devon] Forklift back in service, new battery installed

14 Oct 2019 Monday 16:31 [carter] Vacuum on leg between magnets restored by Ingram.

14 Oct 2019 Monday 15:40 [carter] While attempting to run a new cat6 ethernet cable for the alphatross upgrade I lightly bumped a glass ion gauge on the R65 beam line right after the switching magnet in the congested area between the magnet and the wall. I heard the gate valve over the cryopump between the analyzer and switcher magnet close and the ion gauge on that beam line is off. I believe the bumped ion gauge is fine and maybe a slight burst of gas entered when it was bumped. The vacuum for the beam line reads 2.0E-2 and seems stable at that point so I do not believe there is a permanent leak. I am not comfortable with the procedure to get the gate valve open again and do not want to experiment and make the situation worse. Just wanted to give a heads up for tomorrows run.

11 Oct 2019 Friday 14:59 [Devon] Successfully controlled the terminal at 0.160 MV. Suspect the problem earlier was due to an improperly set terminal voltage dial when going into control mode.

09 Oct 2019 Wednesday 11:40 [Devon] Process chiller: Replaced LPC3, low pressure cut-out small circuit. The compressor was not shutting off after the solenoid valve closed.

02 Oct 2019 Wednesday 17:01 [carter] The alphatross source has arrived.

25 Sep 2019 Wednesday 14:40 [Tom Massey] The plots of the Anaylzer magnet current on the control 1 system does not match that in the web version. We are currently runing with 36 amps on the gauge. The plot on control1 shows zero for the current when using the ACCELERATOR DATA tab, the Magnet Tab and choosing the Analyzer Current.

23 Sep 2019 Monday 09:34 [Devon] The accelerator is back in service. There is a long write up in the log book if you wish to read it.

23 Sep 2019 Monday 09:33 [Devon] Tank opening, 6535 hours. This was basically a pelletron over haul, long read. We were forced to open the tank due to another chain 3 charging failure. Loss of measured upcharge in conjunction with a persistent chain stretch alarm. Upon entry we found the chain 3 forward (sheave end) pillow block bearing had failed severely and dumped all its BBs in the motor tray. The slop in the bearing allowed the shaft extension to tilt enough that the center pin was no longer in contact with the carbon brush and the motor tray sagged far enough to trip the chain stretch alarm. The rear pillow block bearing was also worn, 1/16 or more of play, but had not yet shed its BBs. NEC had told us never to grease those bearings, they are sealed, theyll be fine. Not the best advice since they were bone dry and worn to total failure. I guess I should have realized they needed greased back at the 5000 hour mark when the forward pillow block bolts worked loose and were covered with lubricant that had leaked from the bearing (more on this later). The sheave and shaft extension were removed between the columns which allowed the motor tray and motor to remain fixed in their aligned positions. The extraction required removing the lower courses of column hoops, The beam left electrode, the beam left bias choke (we broke the resistor in an extraction attempt prior to removing the choke), the shaft extension half of the drive coupling, and the rear pillow block riser (the forward riser is trapped in place and cant be removed without pulling the motor tray). Id also recommend wrapping the sheave in a strip of bubble wrap or similar cushioning to protect the edges since the disassembly, removal, and reassembly have the sheave banging around a lot. We contacted NEC to get a new pillow block order under way. They were rather surprised that we had a failure this severe. Luckily they were building up for a conversion on the sister machine in Greece and already had some. We ordered 4 pillow blocks as to have a spare set in the future. While waiting for the new bearings we examined the bolt down situation. The 1-1/4 original bolts only had about a half inch of thread in the riser, yet the riser was tapped down more than an inch. So we ordered 1-3/4 bolts to get an additional half inch of thread contact. The new pillow blocks arrived (Link Belt brand) and I found the engineering documents for this series of bearings. They are rated for over 3000 lbs of radial load and I over estimate we have about 100 lbs radial load. The ratio of loads is off the lifetime chart, lifetime over 200,000 hours. They also insist on these bearings being greased. The grease schedule is based on higher rpms and 24/7 operation but dont account for degradation due to SF6, so Im going to extrapolate to 1 or 2 pumps of grease every year. The old races were seized to the shaft and had to be pressed off, probably due to heat. After rebuilding and reinstalling the sheave/shaft extension another problems was discovered. The plan was to use longer bolts, cover them with vibratite, drill the hex heads and use wire ties. The wire tie idea didnt happen since only one face of the hex head got drilled and of course didnt line up well for wire. Upon trying to install the bolts in the forward pillow block, the bolts drew up tight with half an inch of thread still above the pillow block. An examination of the forward riser with an extendable mirror revealed that the holes in the riser were only partially tapped, 5 or 6 threads. Wow. I suspect that even the original shorter bolts had bottomed out without clamping down the pillow block. This probably allowed vibration and explains why the bolts worked loose at 5000 hours, why weve had numerous wire failures and probably contributed to the bearing failure. I spent a morning reaching in between the columns and plug tapping the rest of the holes in the riser. The pillow blocks are now fully secured with longer bolts and a good dose of vibratite. Upon installing the carbon brush post we found there was almost no travel left on the brush. When taking it apart to replace the brush we found the brush was all still there, the copper wire inside the spring has frayed and ruptured, and the spring had eroded slots in the aluminum cover plate preventing travel. Replaced the brush and turned the cover plate over. Also discovered that the lead counter weights on chain 3 had been snagging on bolts on the motor tray, perfect hex head indentations in the lead. Addressed this by strapping some old belt material to the face of the counter weights on the motor tray side to form a smooth surface. Chain measurements as follows: C1 static, 1-15/16; C2 static, 1-15/16; C3 static, 1-1/32. C1 running, 1-1/2; C2 running, 1-1/2; C3 running, 5/8. These values are either unchanged or changed by 1/16 since the last time they were measured. Still 1/4 inch of running travel between C3 motor tray and alarm switch wheel. Bottom end repaired. Since there was an issue with failed bearings, and since there was some time waiting for new pillow blocks, it was decided to open the top end and terminal to inspect the upper sheaves. Found C1 to be tight, C2 had a little bit of wobble, C3 had a lot of wobble. We had 4 new upper bearings as spares from the upgrade package. Began the process of removing the upper sheaves. In C2 and C3 hubs we found that the bearing outer races had been spinning inside the hub and the race had eaten away the aluminum retaining ring causing lots of dust and axial play. The C2 hub ID had indications of poor machining, areas that were polished and areas that were over turned and not in contact with the race. The C3 hub also appeared to be over turned and oblong in the hub ID. NEC was not willing to bite on the idea that 2 bad hubs ended up in this machine. They did however decide to make new retaining rings from grade 8 washers and provide those to us as warranty. NEC had only one new hub in stock that they would sell us, additional hubs would be 4 week lead time. The plan was buy the new hub and remove all of chain 2 so that we could resume operations with two chains at lower energy and go back in when another new hub became available. However, consultation with the shop determined that a new hub could be produced in a matter of days, so they began to make one. While waiting for the NEC stock hub and retaining rings, and the local manufacture of the other hub, we went ahead and replaced the bearing in C1 hub. Bearing was tight in hub, had to be mildly pressed out. New bearing needed to be mildly pressed in and was sung in the hub. Re-installed the aluminum retaining ring. Also replaced the generator drive belt. The new NEC hub arrived. Applied a thin film of grease to a new bearing, it dropped into the hub. Turned the hub over and the bearing fell back out, too loose. Cleaned off the grease and installed the bearing with a film of locktite blue on the advice of NEC. Installed the grade 8 retaining ring and installed this assembly on chain 3. The shop finished their hub with close attention to tolerance, new bearing tight in hub. Installed grade 8 retaining ring and built as chain 2. All 3 chains back in service. The machine is noticeably quieter than it had been before the failure.

11 Sep 2019 Wednesday 14:16 [Devon] Chiller care instructions: From your favorite internet location, check the "Comfort Chiller Temp (deg F)" plot on the real time status page. Check every half hour to hour. If you see the temperature sharply rising above 50 F you will need to go to the roof and do the reset. There is a 1:16 minute video of me doing this on the control room Windows computer. What you see on the chiller control screen is pressing the "alarms" button, and then on the alarm screen pressing the "reset diagnostics" button. That's it. Sometimes it wants reset every 20 minutes, sometimes it runs for hours.

07 Sep 2019 Saturday 13:57 [Ingram] Comfort chiller restarted by reseting alarms.

26 Aug 2019 Monday 11:29 [carter] New UPS installed in small target room for HP controls box that sets the magnet currents.

26 Aug 2019 Monday 10:43 [Devon] Noticed trouble with the process chiller over the weekend. Small circuit (#3) was not turning off, ran continuous all weekend. Found coils caked with fluff. Cleaned coils but #3 would still not turn off. Determined that gas was just too hot and would not fall below low pressure cut out when solenoid closed. Raised the LPC about 5 psi and it is working properly.

26 Aug 2019 Monday 09:16 [carter] New solid state 500 Gb disc imaged and installed as system disc on tandem.oual.ohiou.edu and other disc retired as backup.

23 Aug 2019 Friday 09:18 [Devon] Catastrophic failure of bearing on chain 3 shaft extension. BBs all over motor tray. Sheave has enough play that it is lifted up beyond the reach of the upcharge brush, explaining the loss of measured charge. There is also a bias spring that has broken on chain 3 beam right electrode. The bearing repair will be at least tedious.

21 Aug 2019 Wednesday 14:20 [carter / kristyn] Chain upcharge current metering circuits tested and all 3 tested OK.

21 Aug 2019 Wednesday 11:32 [Zach Meisel] Chain 3 has no current upon operation.

21 Aug 2019 Wednesday 11:16 [Brandenburg] attempted to start accelertor. After increasing charging voltage to approximately show 1 MV on the terminal, the alarm went off again. After hitting acknolwedge, the alarm continued.

21 Aug 2019 Wednesday 11:12 [Brandenburg] Chain stretch alarm on E1 went off while running. Alarm continued after acknoledge was pushed several time. Accelerator has been shut down. Will try to turn back on accelerator now.

21 Aug 2019 Wednesday 09:57 [Tom Massey] Don and I noticed that the solenoid for the gate valve which opens the end of the swinger to the rest of the swinger was buzzing. This was not attempted to be fixed as the gate valve was open and an experiment was starting

20 Aug 2019 Tuesday 08:03 [Ingram] 3H and door alarms going off, now silenced. HE pump gate valve closed, pump looks okay Many lights off on main consol but breakers appear to have been tripped. Other: two ion gauges had tripped off on Kratos put no sign of a power outage Nearby lightening strike?

15 Aug 2019 Thursday 15:26 [Devon] I purchased a digital caliper for general lab use. It is in the control room desk drawer with the label maker.

29 Jul 2019 Monday 12:27 [Availability for upcoming beamtimes] Greetings Operators, We have several runs coming up in August that will need local operators. None of these involve overnight operations and it is likely that we won't be able to staff both shifts each day for every day on the poll. However, to begin drafting a shift schedule, we need to know your availability. Please fill-out the following Doodle poll if you are interested in being an operator for any of the upcoming runs: https://doodle.com/poll/6scx9x3zwa67n4rb The online schedule can be used to see which dates are for which experiments. Note these are collaborative experiments and so, while there is no additional pay, we expect operators to be recognized as co-authors (Ideally 2+ shifts can be taken for any given experiment). Thanks for your help. -Zach

25 Jul 2019 Thursday 15:14 [Devon] SF6 alarm activated. Nothing remakable in the data. Reset alarm.

24 Jul 2019 Wednesday 16:58 [carter] The logbook special characters seem to be working OK again, !@#$%^&*()_+=-{}[]:;"/'?><

24 Jul 2019 Wednesday 15:38 [carter] logbook test %${};:

24 Jul 2019 Wednesday 10:13 [carter] control1.oual.ohiou.edu was imaged to identical WD2500SB 251GB disk. The newly created disk was installed as the system disk in control1 and left running. The original disk that was the image source was retired 24 July 2019 and placed as reserve image backup and left inside the computer.

19 Jul 2019 Friday 14:40 [c%28%29%2C.ter] another test %40%23%24%25%5E%26*%28%29_%2B%3D-%2F.%2C%3B%3A%27%22

19 Jul 2019 Friday 13:36 [carter] a test of %5C%2C %5C. %5C%28 %5C%29

19 Jul 2019 Friday 13:31 [carter] .%2C%28%29

19 Jul 2019 Friday 12:21 [Devon] Air compressor maintenance. Oil and filter. new unloader diaphrams. Motor case lost nuts on all thread rod. Tightened belts. Found belt tension adjustment bolt sheared off at inner track. Got tension with crow bar and fixed bolts on other track.

19 Jul 2019 Friday 12:20 [carter] a test %2528%2529%252C.%2522%2527%253A%253B

19 Jul 2019 Friday 08:57 [Devon] logbook has messages about encryption%2C and commas also don%27t get written

19 Jul 2019 Friday 08:56 [Devon] Quad 2 is repaired - replaced 2 coils. One that went open circuit recently%2C another that leaked and had its water bypassed long ago.

18 Jul 2019 Thursday 17:05 [carter] It appears open parenthesis %28 and close parenthesis %29 are not working on the logbook.

18 Jul 2019 Thursday 16:52 [carter] A couple of new routines have been written to help tune the switcher magnet and quadrupole magnets to a new energy after a good beam tune has been established at the current energy and you wish to move to a new energy %28especially if the energy move is small%29. This routine scales the magnet currents linearly based on the ratio of the previous energy analyzer current and the new analyzer current. To use this feature%2C after a good tune at one energy and before attempting to change to a new energy%2C type the command %22base%22 in the blue terminal window. This will establish the base energy from which the new energy is scaled. After tuning the analyzer magnet to the new NMR frequency%2C type the command %22retune%22 in the blue terminal window and the switcher magnet and each quadrupole magnet will be set to the new value scaled by the ratio of the base analyzer current and the new analyzer current.

16 Jul 2019 Tuesday 10:25 [carter] Another test message on the new server trying to send email to carter and jacobs

16 Jul 2019 Tuesday 10:24 [carter] A test message on the new webserver without trying to send email.

03 Jul 2019 Wednesday 15:27 [Devon] The alpha source has been out of service since the power outage due to bad readings on both of its Penning gauges. Found that the HV coax wire between control modules was the culprit. Vacuum system in order. Then we found the main power contactor was seized up, coil very hot, stinky, registered on the fire alarm. After some cool down time and lubrication the main power is working again. Alpha source back in operation.

03 Jul 2019 Wednesday 11:20 [Devon] During the quarterly safety system tests we found that the beam warning strobe light at the Vault entrance was not functioning. Replaced the unit.

01 Jul 2019 Monday 06:49 [Ingram] Power is on (6:30 AM). Alarms reset in control room. Keck/Kratos system running normally. DCI

28 Jun 2019 Friday 09:14 [Devon] The accelerator charging has been repaired. The SF6 is back in but has not been dried yet. I'm collecting data to determine if there are SF6 leaks, and where or how severe they may be. Valves 1, 6, 13, and 19 are closed to isolate various sections of the system. The accelerator is not operable until the valves are opened and the gas has been dried.

27 Jun 2019 Thursday 16:02 [carter] Another operators test to Ricky

27 Jun 2019 Thursday 15:56 [Devon] Testing the "all operators" email for new operators.

27 Jun 2019 Thursday 10:17 [carter] The automatic accelerator log settings program that logs the accelerator settings every 15 minutes for the auto database spreadsheet was modified to only log the values if there is > 10uA of upcharge to reduce the size of the file tandem_log.csv.

27 Jun 2019 Thursday 10:13 [carter] The program /var/www/cgi-bin/tandem_log was modified to include the operator name in the file DRDaccum along with the date/time and accumulated DRD value that is specified in the Accelerator Header form.

25 Jun 2019 Tuesday 10:19 [Devon] The spring connecting the chain 3 "-" electrode to the supply choke broke at the choke end. This bias feed continued on to the chain 2 "-" electrode, accounting for the 2/6 charge reduction. Will show the operator 2 class the inside of the machine tomorrow morning, seal up tomorrow afternoon, and gas in Thursday

20 Jun 2019 Thursday 15:23 [Devon] The accelerator just suffered an acute loss of upcharge. On checking the amount of upcharge that we had while running against what was present after the loss, we find that we are getting exactly 4/6 of what we should. Appears that we have lost bias on 2 charging electrodes. Chain 1 is fully charging, chains 2 & 3 are reduced.

17 Jun 2019 Monday 15:06 [Devon] Quad 2 is broken. One of the winding coils is swollen and electrically open. We've bypassed the wiring on that coil and some beam is getting down the 45R line, but its not optimal, pretty bad actually. Quad 2 has another coil that leaked cooling water, the water was bypassed some time ago. Both coils need replaced. The repair is extensive and requires venting of beam lines and removal of the quad assembly.

04 Jun 2019 Tuesday 08:54 [Ingram] Power outage this morning. Alpha source recoverying, had to rough out. Both LE extension pumps iced up. LE beamline cryo section had a lot of gas in. Recoverying cryopumps. No significant gas (<10-2 torr) in the accelerator section of the beamline. Accelerator section now being pumped by the HE pump. Analyzer to switcher section also okay (after ion gauge restart) and pumping normally. Sputter source was not affected. 15L gauges went off but vacuum looks okay. Abandoned RBS run today.

30 May 2019 Thursday 15:17 [Devon] This is a test

17 May 2019 Friday 15:34 [Devon] The alpha source Na heater has been rebuilt and outgassed. Source making 700 nA.

30 Apr 2019 Tuesday 15:17 [Devon] Historical note: All hardware relating to belts and the belt charging system has been scrapped or trashed. No going back from pelletron.

30 Apr 2019 Tuesday 13:19 [Devon] Just noticed that there is no current on the alpha source Na heater. Most likely the heater head wire has failed which is an extensive repair and will hinge upon the viability the thermal ceramic solution which hasn't been opened in years. There's always a chance it could be an external problem with the transformer too. Won't be accessable until Thursday due to Cs source ops.

15 Apr 2019 Monday 13:08 [Tom Massey] Both the HE and LE tube valves were found closed. They had previously been opened. Transient?

12 Apr 2019 Friday 09:13 [Devon] VESDA ECO O2 detectors calibrated

03 Apr 2019 Wednesday 08:17 [Devon] 13C beam test: vacuum baked a cathode made with from the old batch of 13C and fine Ni powder. Baked at around 400C due to lack of attention. At Cs Res of 120C the source built up to an output of 8 uA after about 10 hours, leakage currents low and stable, ran all night without issue. This is a huge improvement. Also found that the LE BPM is a great aid in setting the chopper. Next step is to try a slightly higher Cs Res temp and put beam thru to the gold foil timing check device.

19 Mar 2019 Tuesday 18:40 [Tom Massey] We started at 7.0 MeV deuterons today. The Tandem Watch plot showed smooth behavior for all of the downcharge. The LE current was stable throughout and followed the column and HE down charge.

09 Mar 2019 Saturday 12:22 [Tom Massey] We had a Boy Scout group tour today. We removed the toy Van de Graff from the small target room to the lobby. A shot demostration was done with the Van de Graff. I checked and saw now reset of the radiation monitor. No alarm sounded on any panel.

21 Feb 2019 Thursday 17:37 [ingram] Alpha source extraction is not turning off.

21 Feb 2019 Thursday 08:24 [Ingram] Emergency generator being tested this morning.

15 Feb 2019 Friday 13:57 [Devon] Carbon beam tests. The 13C cathode that we had on hand for a number of years finally ran out, was producing ~7.5 uA on last use. Tried a number of new cathodes for amorphous 13C, mixed 5:1 by mass (per Middleton, basically equal volume) with -100 mesh Ni, equal volume with -125 mesh Ag, equal volume with .08-.15 micron Ni, and equal volume with graphite. In all cases beam yield was low, on the order of a microamp or less, and the source output suffered from periodic spikes in head voltage currents coupled with a crash in beam current. After each crash the beam would recover to the previous level until the next crash. The frequency of the crashes was proportional to the amount of Cs as set by the PID controller on the reservoir, the more Cs, the more frequent the crashes. Between crashes the head voltage currents had reasonable values. The graphite/13C mixture seemed to give the best beam yield at 1.5/1 uA of 12C/13C. There was also uncertainty on resolving peaks with the inflection magnet. The magnet was periodically swept to look at relative intensity of observed peaks with monitoring being done on the largest peak. Turns out that the inflection magnet calibrations on hand for all these years were not very accurate, and the monitored peaks may well have been mass 14 or 16. The Inflection magnet calibration was re-done during the graphite/13C test with 12 known-to-be-good data points which resulted in the new magnet calibration that is posted in the books. The 12C and 13C peaks were validated by analyzing the +3 beams with the accelerator. For a confirmation of source behavior, a previously used graphite cathode was loaded and operated for extended time at different Cs reservoir temperatures. No sign of the periodic crashes after operating a day, all night, and the next day. At Cs Res = 95C, 12C = 4 uA. 100C = 9 uA. 105C = 14 uA. Just for fun, got off the 14 uA 12C peak and found 200 nA of mass 13, 1.4%. Probably mostly natural 13C, maybe a little 12CH. After a few hours at 105C there began to be random ticks in the head target voltage. Maybe not surprising since this pellet had previously overwhelmed the source at 110C. The future of 13C beams is still TBD…

11 Feb 2019 Monday 16:24 [carter] A software imposed maximum current limit has been incorporated in the tweaking magnet control software to prevent the supply from going into protection mode.

05 Feb 2019 Tuesday 15:21 [carter] Found that previous solution to the 0,75 Hz periodic high frequency noise by grounding the BPO inverting transformer introduced a problem that caused the BPO amplifier to "lock out" at 60 Hz for about 1 ms every 16 ms. Now back to the inverting transformer with ground isolation and the BPO is again good.

01 Feb 2019 Friday 15:52 [carter] Replaced UPS above BPM with new APC Back-UPS Pro 1000S. When restarting control1 computer found it would not power on, replaced control1 computer power supply. Then found Planar PL1910M monitor for control1 would not power on, replaced with another Planar monitor. All seems back to normal now.

31 Jan 2019 Thursday 19:22 [DCI] UPS above the scope for the beam profile monitir was in a state of alarm. It has gone quiet again after several minutes.

29 Jan 2019 Tuesday 11:25 [Shift sign-up for next week's CMU run] Greetings Operators, Next week our friends from Central Michigan University will be back to run 40Ar(p,n) on the beam-swinger line. The plan is to run overnight from Tuesday on. Running on Saturday is unlikely, but not out of the question. Please indicated your availability and willingness to be an operator in the Doodle link below. Note that this is a collaborative run and so won't involve any bonus pay. https://doodle.com/poll/ikxcctsz78zk8cvt Thanks for pitching in! -Zach

25 Jan 2019 Friday 16:03 [Devon] 2019 Maintenance: 6007 hours. No problems inside the tank so no entry, but, 1588 hours and 2 years since last gas system maintenance. Opened the recirculator pig to find it coated with brass dust. Apparently the relief valve is operating some. The test pull handle on the seal bonnet is getting off axis and rubbing the hole in the spring tensioner cap. Wear spot indicates no appreciable axial travel, its like the bonnet is just tilting open a little on one side. Shop fabricated a Teflon bushing to try to keep the action on axis. Changed blower oil, greased motor and blower. Chain coupling was dry but not much wear on it and sprockets. Cleaned with WD40, re-installed. Scrubber cartridges serviced, all 3 sieves gained weight again, 5A by a factor of 10.7%, 4A by 9.1%, 3A by 11.2%. The idea of not going into the tank was a bust. The man door leaked badly on gas in even though it was never opened. The leak was bad enough to register on the VESDA O2 monitor in the pit and it never sealed by full tank pressure. So, entry. The chain 3 charging current lead is rock solid in the P clamp. The static chain measurements were as follows: C1= 1-7/8”, same as 1020 hours ago. C2 = 1-15/16”, also unchanged. C3 = 1”, a drop of 1/16” from 1020 hours ago. Chain 3 should have another 5/16” to go before hitting the alarm switch. With so little change in static measurement we skipped the running measurements. Meggered all resistors. Found one column resistor open, replaced. Odd that there were no signs of a bad resistor in last runs.

25 Jan 2019 Friday 12:43 [Devon] Cesium sputter source not working well with new 13C. Low yield, 1.5 uA, and unstable yield, periodic spikes in PS currents. Replenished Cs reservoir, very little left but not bone dry. Checked acc tube resistors, all good.

23 Jan 2019 Wednesday 11:20 [carter] The switches on the collimator current meter unit were cleaned with De-Oxit contact cleaner.

23 Jan 2019 Wednesday 11:19 [carter] Keithley picoammeter (beam current) meter switches cleaned and lubricated to repair difficult to rotate polarity switch. Also, replaced power supply filter capacitors in the unit.

09 Jan 2019 Wednesday 16:43 [carter] nmrgoto problem resolved, the filter capacitor in the 10 volt step pulse pull-up supply at the controller was bad causing large 60 Hz ripple on the step pulse pull up value resulting in a fraction of the step pulses being too small to step the stepping motot controller. Replaced the capacitor and now using the original nmrgoto command values with good results.

08 Jan 2019 Tuesday 15:47 [Devon] Pelletron hour meter reading 1/8/2019: 6007. Accelerator operating hours in 2018: 846.

02 Jan 2019 Wednesday 15:02 [Carter] Operators... Please remember to turn off the Ludlum dosimeter when shutting down the accelerator to conserve the batteries.

02 Jan 2019 Wednesday 11:45 [carter/jacobs] Quarterly alarm and shutdown tests complete for January 2019 by Carter/Jacobs. Modified the email section of the reminder program to reflect the recent domain change from ohiou.edu to ohio.edu so email reminders and acknowledge should work properly next quarter.

02 Jan 2019 Wednesday 11:14 [carter/jacobs] Tritium monitor repair, new diaphram, oil bearings and new air inlet filter.

23 Dec 2018 Sunday 09:21 [Devon] The tritium monitor pump was violently noisy. Turned the monitor off until we can work on it.

22 Dec 2018 Saturday 18:15 [Ingram] Power came back at 6:00 PM after second outage. I have switched the nitrogen bottle on the Keck system for a new one. I was doing that when the power came back on. That was the last full nitrogen bottle, we need to order one.

21 Dec 2018 Friday 16:53 [carter] The swinger BPO noise (high frequency RF at ~0.75 Hz repeating) nearly completely removed by removing the ground isolation feature of the inverting transformer used in the BPO circuit.

12 Dec 2018 Wednesday 13:22 [Devon] FM finally here to look at down chiller. (control cabinet had blown open on stormy, windy day. Got wet, shut down). They cleared the errors and re-started. Chiller appears to be undamaged.

06 Dec 2018 Thursday 11:09 [carter] The NMR command "nmrgoto" was missing its target so a "fudge" factor has been included in the command calculation to help get closer to the desired frequency. Diagnostics are continuing but a convenient workaround program named "nmrto" has been created that works the same as the mnrgoto command (enter a floating poingt frequency in MHz. for example "nmrto 8.627866") but will make multiple attempts to get close to the entered frequency and seems to work well, even better than before.

05 Dec 2018 Wednesday 08:04 [Ingram] Source camera not responding to movement controls, blue buttons.

01 Dec 2018 Saturday 11:37 [KB/RG] The E1 water and vacuum systems/phase failure detected alarm was going off a few minutes ago. Rekam and I (Kristyn) have acknowledged the alarm and checked to see if vacuum remained. We still have vacuum, so no further action is required.

26 Nov 2018 Monday 15:12 [Shift schedule for this week] Greetings Operators, Thanks for signing up for shifts this week. The resultant schedule is here: https://docs.google.com/spreadsheets/d/1IgQk3vepSmgd_0yMm9pDD1FSWhcT2CjqdMoR_9_W3vU/edit?usp=sharing -Zach

26 Nov 2018 Monday 13:40 [Shift sign-up for this week's ORNL run] Greetings Operators, Please fill-out the following Doodle poll if you can be an operator for this week's experiment: https://doodle.com/poll/kghxz8t728n88znt. As usual, we'll wind-up having one operator from 8-4 and two otherwise. I'm not sure if we'll be able to have overnight operation or not, but it would be good to know if this is possible. Just as a heads-up, this is a collaborative beam time [i.e. is intended to lead to a paper] so it isn't paid extra. Apologies for the late notice and thanks for your participation! -Zach

16 Nov 2018 Friday 11:32 [carter/Brandenburg] CMU experiment finished. 1.5 hours after the sputter source heaters were run down and temperatures had stabalized and were at shutdown temperatures, the Target Current had leveled off to 5 ma and was not falling. Target Current remaind at 5 ma for nearly an hour then source power supplies were shut down anyway.

06 Nov 2018 Tuesday 07:40 [Devon] VESDA: calibrated ECO O2 sensors

05 Nov 2018 Monday 15:31 [Availability for CMU experiment (doodle poll)] Greetings Operators, Next week, Tuesday November 13 - Friday November 16, George Perdikakis and Panos Gastis will be visiting the accelerator lab to run 40Ar(p,n). They are interested in running overnight, if we can manage. Please fill-out this Doodle poll within the next day or two so that I can look into setting up a schedule for the experiment. If you are only Operator 1 trained, please indicate this with a comment below the poll. Poll: https://doodle.com/poll/5vkvg8pn3i4qerk4 Thanks for your help. -Zach

05 Nov 2018 Monday 14:33 [Devon] A proton beam and Don will be available tomorrow, Tuesday, 11/6, after 10:00, for pulsing and bunching training and/or review. NMR training may also be a possibility if time permits. Those of you operators that need these skills should try to stop by. You can view your training status at: https://edwards2.phy.ohiou.edu/~oual/operators/operators.php

01 Nov 2018 Thursday 11:16 [carter] Test message in logbook

23 Oct 2018 Tuesday 15:23 [Devon] Process chiller is back in business. It was the tee fitting that sprung a leak. The flare on the fan differential switch capillary was fine. FM pumped all the gas out of the circuit to remove the tee, but on removal it was discovered that the port on the coil manifold has a Schrader valve. Any time we have trouble with fan diff switches we don't need to worry about removing gas from the circuit because the tees are on Schrader valves. The gas was put back in the circuit and we observed low pressure cycling at start up but then successful running. When the second circuit started and both fans ran the small circuit suffered low pressure cutouts. Both cases expected for low gas charge due to leak off. Added more gas to the small circuit and everything is working fine. Ambient temp was 62 today.

17 Oct 2018 Wednesday 08:18 [Devon] Sputter source: Cleaned. Tap hole for top bolt on target shroud stripped on first few threads, longer bolt with nut as spacer used. Airlock bolt at target power lead not threading well, may be time to replace lexan section. Cs oven re-used.

12 Oct 2018 Friday 14:05 [Yenuel Jones-Alberty] Completed Operator 2.

01 Oct 2018 Monday 11:45 [Devon] Process chiller update: small circuit ran with normal behavior most of the weekend, there was some short cycling during the peak heat of the days. It was running happily first thing Monday, I set the low pressure cutout back up to where it should be for 34F at the HX baffles. By 10am it was ambient warm enough to cause low pressure cutouts. Found the leak in the circuit, its at a small tee where the fan differential pressure switch ties in. I need some shop Doug consultation before laying wrench on it, may be wise to use the compressor to pump Freon into safe storage before taking a chance on breaking something. The small circuit is disabled for the time being. The middle and large circuits will handle our loads. The fan differential switch on the large circuit chattered at first use again (previous log story), seemed to settle down and hold contact after a short time.

Connection from IP address 3.214.184.124
Time: 2019 Dec 09 7:42:42
Found 2376 logbook entries, displaying most recent 100

Logbook Contents (Most Recent Entries)

06 Dec 2019 Friday 12:24 [Devon] Cesium sputter source cleaned. Cs reservoir not installed waiting till January to load with Cs due to numerous scheduled power outages. Replaced the lexan air lock window with a modified design, 4 small thru holes instead of 8 counter bore and tapped holes. The pair of cathode sheaths had developed jagged leading edges over years of sputtering. A pair of old 3/8 sheaths were modified to the 1/2" design. Should be good on sheaths for a number of years.

03 Dec 2019 Tuesday 04:43 [Devon] Fire alarm in the small target room at 4:00 am. Smell of burned electrical but can't find the source at this time, will have to be on the look out for something that doesn't work. VESDA back to normal in room. The fire panel developed an error on reset, doesn't recognize the vault zone, giving trouble alarms, need Life Safety in the morning

26 Nov 2019 Tuesday 10:14 [Devon] Reminder: There is a significant power outage scheduled to occur overnight. I'll have beam line vacuum systems shut down by 2 pm today.

23 Nov 2019 Saturday 12:06 [Devon] The old O2 sensor that was temporarily installed while waiting for a new one chose Saturday to crap out. New sensor had arrived and is installed. Was waiting for Life Safety to give me access and training to disable the buzzer and dialer in the fire panel for VESDA maintenance, was supposed to be yesterday but nothing from them.

18 Nov 2019 Monday 12:53 [Devon] Had to install and calibrate one of the O2 sensors that was replaced in may. The "new" one that was 2 years old quit functioning. The distributer has replaced it with a new one (DOM 8/19) under warranty. Will install it when time permits...

12 Nov 2019 Tuesday 09:54 [Devon] Trouble with the ECO O2 sensors. Got a gas out of range warning on the sensor that was 2 years old when purchased. Xtralis insisted it would be fine. Found it reporting 37% O2. Did calibration, zero gas reading 17% before calibrating to 0. Span calibration wouldn't hold, kept rising to 23%. Airflow was 78, normalized it 100. Redid the span, seems to be creeping up again, will monitor. The other sensor was due for calibration in 2 weeks, did it, no problems.

23 Oct 2019 Wednesday 11:00 [Devon] Forklift back in service, new battery installed

14 Oct 2019 Monday 16:31 [carter] Vacuum on leg between magnets restored by Ingram.

14 Oct 2019 Monday 15:40 [carter] While attempting to run a new cat6 ethernet cable for the alphatross upgrade I lightly bumped a glass ion gauge on the R65 beam line right after the switching magnet in the congested area between the magnet and the wall. I heard the gate valve over the cryopump between the analyzer and switcher magnet close and the ion gauge on that beam line is off. I believe the bumped ion gauge is fine and maybe a slight burst of gas entered when it was bumped. The vacuum for the beam line reads 2.0E-2 and seems stable at that point so I do not believe there is a permanent leak. I am not comfortable with the procedure to get the gate valve open again and do not want to experiment and make the situation worse. Just wanted to give a heads up for tomorrows run.

11 Oct 2019 Friday 14:59 [Devon] Successfully controlled the terminal at 0.160 MV. Suspect the problem earlier was due to an improperly set terminal voltage dial when going into control mode.

09 Oct 2019 Wednesday 11:40 [Devon] Process chiller: Replaced LPC3, low pressure cut-out small circuit. The compressor was not shutting off after the solenoid valve closed.

02 Oct 2019 Wednesday 17:01 [carter] The alphatross source has arrived.

25 Sep 2019 Wednesday 14:40 [Tom Massey] The plots of the Anaylzer magnet current on the control 1 system does not match that in the web version. We are currently runing with 36 amps on the gauge. The plot on control1 shows zero for the current when using the ACCELERATOR DATA tab, the Magnet Tab and choosing the Analyzer Current.

23 Sep 2019 Monday 09:34 [Devon] The accelerator is back in service. There is a long write up in the log book if you wish to read it.

23 Sep 2019 Monday 09:33 [Devon] Tank opening, 6535 hours. This was basically a pelletron over haul, long read. We were forced to open the tank due to another chain 3 charging failure. Loss of measured upcharge in conjunction with a persistent chain stretch alarm. Upon entry we found the chain 3 forward (sheave end) pillow block bearing had failed severely and dumped all its BBs in the motor tray. The slop in the bearing allowed the shaft extension to tilt enough that the center pin was no longer in contact with the carbon brush and the motor tray sagged far enough to trip the chain stretch alarm. The rear pillow block bearing was also worn, 1/16 or more of play, but had not yet shed its BBs. NEC had told us never to grease those bearings, they are sealed, theyll be fine. Not the best advice since they were bone dry and worn to total failure. I guess I should have realized they needed greased back at the 5000 hour mark when the forward pillow block bolts worked loose and were covered with lubricant that had leaked from the bearing (more on this later). The sheave and shaft extension were removed between the columns which allowed the motor tray and motor to remain fixed in their aligned positions. The extraction required removing the lower courses of column hoops, The beam left electrode, the beam left bias choke (we broke the resistor in an extraction attempt prior to removing the choke), the shaft extension half of the drive coupling, and the rear pillow block riser (the forward riser is trapped in place and cant be removed without pulling the motor tray). Id also recommend wrapping the sheave in a strip of bubble wrap or similar cushioning to protect the edges since the disassembly, removal, and reassembly have the sheave banging around a lot. We contacted NEC to get a new pillow block order under way. They were rather surprised that we had a failure this severe. Luckily they were building up for a conversion on the sister machine in Greece and already had some. We ordered 4 pillow blocks as to have a spare set in the future. While waiting for the new bearings we examined the bolt down situation. The 1-1/4 original bolts only had about a half inch of thread in the riser, yet the riser was tapped down more than an inch. So we ordered 1-3/4 bolts to get an additional half inch of thread contact. The new pillow blocks arrived (Link Belt brand) and I found the engineering documents for this series of bearings. They are rated for over 3000 lbs of radial load and I over estimate we have about 100 lbs radial load. The ratio of loads is off the lifetime chart, lifetime over 200,000 hours. They also insist on these bearings being greased. The grease schedule is based on higher rpms and 24/7 operation but dont account for degradation due to SF6, so Im going to extrapolate to 1 or 2 pumps of grease every year. The old races were seized to the shaft and had to be pressed off, probably due to heat. After rebuilding and reinstalling the sheave/shaft extension another problems was discovered. The plan was to use longer bolts, cover them with vibratite, drill the hex heads and use wire ties. The wire tie idea didnt happen since only one face of the hex head got drilled and of course didnt line up well for wire. Upon trying to install the bolts in the forward pillow block, the bolts drew up tight with half an inch of thread still above the pillow block. An examination of the forward riser with an extendable mirror revealed that the holes in the riser were only partially tapped, 5 or 6 threads. Wow. I suspect that even the original shorter bolts had bottomed out without clamping down the pillow block. This probably allowed vibration and explains why the bolts worked loose at 5000 hours, why weve had numerous wire failures and probably contributed to the bearing failure. I spent a morning reaching in between the columns and plug tapping the rest of the holes in the riser. The pillow blocks are now fully secured with longer bolts and a good dose of vibratite. Upon installing the carbon brush post we found there was almost no travel left on the brush. When taking it apart to replace the brush we found the brush was all still there, the copper wire inside the spring has frayed and ruptured, and the spring had eroded slots in the aluminum cover plate preventing travel. Replaced the brush and turned the cover plate over. Also discovered that the lead counter weights on chain 3 had been snagging on bolts on the motor tray, perfect hex head indentations in the lead. Addressed this by strapping some old belt material to the face of the counter weights on the motor tray side to form a smooth surface. Chain measurements as follows: C1 static, 1-15/16; C2 static, 1-15/16; C3 static, 1-1/32. C1 running, 1-1/2; C2 running, 1-1/2; C3 running, 5/8. These values are either unchanged or changed by 1/16 since the last time they were measured. Still 1/4 inch of running travel between C3 motor tray and alarm switch wheel. Bottom end repaired. Since there was an issue with failed bearings, and since there was some time waiting for new pillow blocks, it was decided to open the top end and terminal to inspect the upper sheaves. Found C1 to be tight, C2 had a little bit of wobble, C3 had a lot of wobble. We had 4 new upper bearings as spares from the upgrade package. Began the process of removing the upper sheaves. In C2 and C3 hubs we found that the bearing outer races had been spinning inside the hub and the race had eaten away the aluminum retaining ring causing lots of dust and axial play. The C2 hub ID had indications of poor machining, areas that were polished and areas that were over turned and not in contact with the race. The C3 hub also appeared to be over turned and oblong in the hub ID. NEC was not willing to bite on the idea that 2 bad hubs ended up in this machine. They did however decide to make new retaining rings from grade 8 washers and provide those to us as warranty. NEC had only one new hub in stock that they would sell us, additional hubs would be 4 week lead time. The plan was buy the new hub and remove all of chain 2 so that we could resume operations with two chains at lower energy and go back in when another new hub became available. However, consultation with the shop determined that a new hub could be produced in a matter of days, so they began to make one. While waiting for the NEC stock hub and retaining rings, and the local manufacture of the other hub, we went ahead and replaced the bearing in C1 hub. Bearing was tight in hub, had to be mildly pressed out. New bearing needed to be mildly pressed in and was sung in the hub. Re-installed the aluminum retaining ring. Also replaced the generator drive belt. The new NEC hub arrived. Applied a thin film of grease to a new bearing, it dropped into the hub. Turned the hub over and the bearing fell back out, too loose. Cleaned off the grease and installed the bearing with a film of locktite blue on the advice of NEC. Installed the grade 8 retaining ring and installed this assembly on chain 3. The shop finished their hub with close attention to tolerance, new bearing tight in hub. Installed grade 8 retaining ring and built as chain 2. All 3 chains back in service. The machine is noticeably quieter than it had been before the failure.

11 Sep 2019 Wednesday 14:16 [Devon] Chiller care instructions: From your favorite internet location, check the "Comfort Chiller Temp (deg F)" plot on the real time status page. Check every half hour to hour. If you see the temperature sharply rising above 50 F you will need to go to the roof and do the reset. There is a 1:16 minute video of me doing this on the control room Windows computer. What you see on the chiller control screen is pressing the "alarms" button, and then on the alarm screen pressing the "reset diagnostics" button. That's it. Sometimes it wants reset every 20 minutes, sometimes it runs for hours.

07 Sep 2019 Saturday 13:57 [Ingram] Comfort chiller restarted by reseting alarms.

26 Aug 2019 Monday 11:29 [carter] New UPS installed in small target room for HP controls box that sets the magnet currents.

26 Aug 2019 Monday 10:43 [Devon] Noticed trouble with the process chiller over the weekend. Small circuit (#3) was not turning off, ran continuous all weekend. Found coils caked with fluff. Cleaned coils but #3 would still not turn off. Determined that gas was just too hot and would not fall below low pressure cut out when solenoid closed. Raised the LPC about 5 psi and it is working properly.

26 Aug 2019 Monday 09:16 [carter] New solid state 500 Gb disc imaged and installed as system disc on tandem.oual.ohiou.edu and other disc retired as backup.

23 Aug 2019 Friday 09:18 [Devon] Catastrophic failure of bearing on chain 3 shaft extension. BBs all over motor tray. Sheave has enough play that it is lifted up beyond the reach of the upcharge brush, explaining the loss of measured charge. There is also a bias spring that has broken on chain 3 beam right electrode. The bearing repair will be at least tedious.

21 Aug 2019 Wednesday 14:20 [carter / kristyn] Chain upcharge current metering circuits tested and all 3 tested OK.

21 Aug 2019 Wednesday 11:32 [Zach Meisel] Chain 3 has no current upon operation.

21 Aug 2019 Wednesday 11:16 [Brandenburg] attempted to start accelertor. After increasing charging voltage to approximately show 1 MV on the terminal, the alarm went off again. After hitting acknolwedge, the alarm continued.

21 Aug 2019 Wednesday 11:12 [Brandenburg] Chain stretch alarm on E1 went off while running. Alarm continued after acknoledge was pushed several time. Accelerator has been shut down. Will try to turn back on accelerator now.

21 Aug 2019 Wednesday 09:57 [Tom Massey] Don and I noticed that the solenoid for the gate valve which opens the end of the swinger to the rest of the swinger was buzzing. This was not attempted to be fixed as the gate valve was open and an experiment was starting

20 Aug 2019 Tuesday 08:03 [Ingram] 3H and door alarms going off, now silenced. HE pump gate valve closed, pump looks okay Many lights off on main consol but breakers appear to have been tripped. Other: two ion gauges had tripped off on Kratos put no sign of a power outage Nearby lightening strike?

15 Aug 2019 Thursday 15:26 [Devon] I purchased a digital caliper for general lab use. It is in the control room desk drawer with the label maker.

29 Jul 2019 Monday 12:27 [Availability for upcoming beamtimes] Greetings Operators, We have several runs coming up in August that will need local operators. None of these involve overnight operations and it is likely that we won't be able to staff both shifts each day for every day on the poll. However, to begin drafting a shift schedule, we need to know your availability. Please fill-out the following Doodle poll if you are interested in being an operator for any of the upcoming runs: https://doodle.com/poll/6scx9x3zwa67n4rb The online schedule can be used to see which dates are for which experiments. Note these are collaborative experiments and so, while there is no additional pay, we expect operators to be recognized as co-authors (Ideally 2+ shifts can be taken for any given experiment). Thanks for your help. -Zach

25 Jul 2019 Thursday 15:14 [Devon] SF6 alarm activated. Nothing remakable in the data. Reset alarm.

24 Jul 2019 Wednesday 16:58 [carter] The logbook special characters seem to be working OK again, !@#$%^&*()_+=-{}[]:;"/'?><

24 Jul 2019 Wednesday 15:38 [carter] logbook test %${};:

24 Jul 2019 Wednesday 10:13 [carter] control1.oual.ohiou.edu was imaged to identical WD2500SB 251GB disk. The newly created disk was installed as the system disk in control1 and left running. The original disk that was the image source was retired 24 July 2019 and placed as reserve image backup and left inside the computer.

19 Jul 2019 Friday 14:40 [c%28%29%2C.ter] another test %40%23%24%25%5E%26*%28%29_%2B%3D-%2F.%2C%3B%3A%27%22

19 Jul 2019 Friday 13:36 [carter] a test of %5C%2C %5C. %5C%28 %5C%29

19 Jul 2019 Friday 13:31 [carter] .%2C%28%29

19 Jul 2019 Friday 12:21 [Devon] Air compressor maintenance. Oil and filter. new unloader diaphrams. Motor case lost nuts on all thread rod. Tightened belts. Found belt tension adjustment bolt sheared off at inner track. Got tension with crow bar and fixed bolts on other track.

19 Jul 2019 Friday 12:20 [carter] a test %2528%2529%252C.%2522%2527%253A%253B

19 Jul 2019 Friday 08:57 [Devon] logbook has messages about encryption%2C and commas also don%27t get written

19 Jul 2019 Friday 08:56 [Devon] Quad 2 is repaired - replaced 2 coils. One that went open circuit recently%2C another that leaked and had its water bypassed long ago.

18 Jul 2019 Thursday 17:05 [carter] It appears open parenthesis %28 and close parenthesis %29 are not working on the logbook.

18 Jul 2019 Thursday 16:52 [carter] A couple of new routines have been written to help tune the switcher magnet and quadrupole magnets to a new energy after a good beam tune has been established at the current energy and you wish to move to a new energy %28especially if the energy move is small%29. This routine scales the magnet currents linearly based on the ratio of the previous energy analyzer current and the new analyzer current. To use this feature%2C after a good tune at one energy and before attempting to change to a new energy%2C type the command %22base%22 in the blue terminal window. This will establish the base energy from which the new energy is scaled. After tuning the analyzer magnet to the new NMR frequency%2C type the command %22retune%22 in the blue terminal window and the switcher magnet and each quadrupole magnet will be set to the new value scaled by the ratio of the base analyzer current and the new analyzer current.

16 Jul 2019 Tuesday 10:25 [carter] Another test message on the new server trying to send email to carter and jacobs

16 Jul 2019 Tuesday 10:24 [carter] A test message on the new webserver without trying to send email.

03 Jul 2019 Wednesday 15:27 [Devon] The alpha source has been out of service since the power outage due to bad readings on both of its Penning gauges. Found that the HV coax wire between control modules was the culprit. Vacuum system in order. Then we found the main power contactor was seized up, coil very hot, stinky, registered on the fire alarm. After some cool down time and lubrication the main power is working again. Alpha source back in operation.

03 Jul 2019 Wednesday 11:20 [Devon] During the quarterly safety system tests we found that the beam warning strobe light at the Vault entrance was not functioning. Replaced the unit.

01 Jul 2019 Monday 06:49 [Ingram] Power is on (6:30 AM). Alarms reset in control room. Keck/Kratos system running normally. DCI

28 Jun 2019 Friday 09:14 [Devon] The accelerator charging has been repaired. The SF6 is back in but has not been dried yet. I'm collecting data to determine if there are SF6 leaks, and where or how severe they may be. Valves 1, 6, 13, and 19 are closed to isolate various sections of the system. The accelerator is not operable until the valves are opened and the gas has been dried.

27 Jun 2019 Thursday 16:02 [carter] Another operators test to Ricky

27 Jun 2019 Thursday 15:56 [Devon] Testing the "all operators" email for new operators.

27 Jun 2019 Thursday 10:17 [carter] The automatic accelerator log settings program that logs the accelerator settings every 15 minutes for the auto database spreadsheet was modified to only log the values if there is > 10uA of upcharge to reduce the size of the file tandem_log.csv.

27 Jun 2019 Thursday 10:13 [carter] The program /var/www/cgi-bin/tandem_log was modified to include the operator name in the file DRDaccum along with the date/time and accumulated DRD value that is specified in the Accelerator Header form.

25 Jun 2019 Tuesday 10:19 [Devon] The spring connecting the chain 3 "-" electrode to the supply choke broke at the choke end. This bias feed continued on to the chain 2 "-" electrode, accounting for the 2/6 charge reduction. Will show the operator 2 class the inside of the machine tomorrow morning, seal up tomorrow afternoon, and gas in Thursday

20 Jun 2019 Thursday 15:23 [Devon] The accelerator just suffered an acute loss of upcharge. On checking the amount of upcharge that we had while running against what was present after the loss, we find that we are getting exactly 4/6 of what we should. Appears that we have lost bias on 2 charging electrodes. Chain 1 is fully charging, chains 2 & 3 are reduced.

17 Jun 2019 Monday 15:06 [Devon] Quad 2 is broken. One of the winding coils is swollen and electrically open. We've bypassed the wiring on that coil and some beam is getting down the 45R line, but its not optimal, pretty bad actually. Quad 2 has another coil that leaked cooling water, the water was bypassed some time ago. Both coils need replaced. The repair is extensive and requires venting of beam lines and removal of the quad assembly.

04 Jun 2019 Tuesday 08:54 [Ingram] Power outage this morning. Alpha source recoverying, had to rough out. Both LE extension pumps iced up. LE beamline cryo section had a lot of gas in. Recoverying cryopumps. No significant gas (<10-2 torr) in the accelerator section of the beamline. Accelerator section now being pumped by the HE pump. Analyzer to switcher section also okay (after ion gauge restart) and pumping normally. Sputter source was not affected. 15L gauges went off but vacuum looks okay. Abandoned RBS run today.

30 May 2019 Thursday 15:17 [Devon] This is a test

17 May 2019 Friday 15:34 [Devon] The alpha source Na heater has been rebuilt and outgassed. Source making 700 nA.

30 Apr 2019 Tuesday 15:17 [Devon] Historical note: All hardware relating to belts and the belt charging system has been scrapped or trashed. No going back from pelletron.

30 Apr 2019 Tuesday 13:19 [Devon] Just noticed that there is no current on the alpha source Na heater. Most likely the heater head wire has failed which is an extensive repair and will hinge upon the viability the thermal ceramic solution which hasn't been opened in years. There's always a chance it could be an external problem with the transformer too. Won't be accessable until Thursday due to Cs source ops.

15 Apr 2019 Monday 13:08 [Tom Massey] Both the HE and LE tube valves were found closed. They had previously been opened. Transient?

12 Apr 2019 Friday 09:13 [Devon] VESDA ECO O2 detectors calibrated

03 Apr 2019 Wednesday 08:17 [Devon] 13C beam test: vacuum baked a cathode made with from the old batch of 13C and fine Ni powder. Baked at around 400C due to lack of attention. At Cs Res of 120C the source built up to an output of 8 uA after about 10 hours, leakage currents low and stable, ran all night without issue. This is a huge improvement. Also found that the LE BPM is a great aid in setting the chopper. Next step is to try a slightly higher Cs Res temp and put beam thru to the gold foil timing check device.

19 Mar 2019 Tuesday 18:40 [Tom Massey] We started at 7.0 MeV deuterons today. The Tandem Watch plot showed smooth behavior for all of the downcharge. The LE current was stable throughout and followed the column and HE down charge.

09 Mar 2019 Saturday 12:22 [Tom Massey] We had a Boy Scout group tour today. We removed the toy Van de Graff from the small target room to the lobby. A shot demostration was done with the Van de Graff. I checked and saw now reset of the radiation monitor. No alarm sounded on any panel.

21 Feb 2019 Thursday 17:37 [ingram] Alpha source extraction is not turning off.

21 Feb 2019 Thursday 08:24 [Ingram] Emergency generator being tested this morning.

15 Feb 2019 Friday 13:57 [Devon] Carbon beam tests. The 13C cathode that we had on hand for a number of years finally ran out, was producing ~7.5 uA on last use. Tried a number of new cathodes for amorphous 13C, mixed 5:1 by mass (per Middleton, basically equal volume) with -100 mesh Ni, equal volume with -125 mesh Ag, equal volume with .08-.15 micron Ni, and equal volume with graphite. In all cases beam yield was low, on the order of a microamp or less, and the source output suffered from periodic spikes in head voltage currents coupled with a crash in beam current. After each crash the beam would recover to the previous level until the next crash. The frequency of the crashes was proportional to the amount of Cs as set by the PID controller on the reservoir, the more Cs, the more frequent the crashes. Between crashes the head voltage currents had reasonable values. The graphite/13C mixture seemed to give the best beam yield at 1.5/1 uA of 12C/13C. There was also uncertainty on resolving peaks with the inflection magnet. The magnet was periodically swept to look at relative intensity of observed peaks with monitoring being done on the largest peak. Turns out that the inflection magnet calibrations on hand for all these years were not very accurate, and the monitored peaks may well have been mass 14 or 16. The Inflection magnet calibration was re-done during the graphite/13C test with 12 known-to-be-good data points which resulted in the new magnet calibration that is posted in the books. The 12C and 13C peaks were validated by analyzing the +3 beams with the accelerator. For a confirmation of source behavior, a previously used graphite cathode was loaded and operated for extended time at different Cs reservoir temperatures. No sign of the periodic crashes after operating a day, all night, and the next day. At Cs Res = 95C, 12C = 4 uA. 100C = 9 uA. 105C = 14 uA. Just for fun, got off the 14 uA 12C peak and found 200 nA of mass 13, 1.4%. Probably mostly natural 13C, maybe a little 12CH. After a few hours at 105C there began to be random ticks in the head target voltage. Maybe not surprising since this pellet had previously overwhelmed the source at 110C. The future of 13C beams is still TBD…

11 Feb 2019 Monday 16:24 [carter] A software imposed maximum current limit has been incorporated in the tweaking magnet control software to prevent the supply from going into protection mode.

05 Feb 2019 Tuesday 15:21 [carter] Found that previous solution to the 0,75 Hz periodic high frequency noise by grounding the BPO inverting transformer introduced a problem that caused the BPO amplifier to "lock out" at 60 Hz for about 1 ms every 16 ms. Now back to the inverting transformer with ground isolation and the BPO is again good.

01 Feb 2019 Friday 15:52 [carter] Replaced UPS above BPM with new APC Back-UPS Pro 1000S. When restarting control1 computer found it would not power on, replaced control1 computer power supply. Then found Planar PL1910M monitor for control1 would not power on, replaced with another Planar monitor. All seems back to normal now.

31 Jan 2019 Thursday 19:22 [DCI] UPS above the scope for the beam profile monitir was in a state of alarm. It has gone quiet again after several minutes.

29 Jan 2019 Tuesday 11:25 [Shift sign-up for next week's CMU run] Greetings Operators, Next week our friends from Central Michigan University will be back to run 40Ar(p,n) on the beam-swinger line. The plan is to run overnight from Tuesday on. Running on Saturday is unlikely, but not out of the question. Please indicated your availability and willingness to be an operator in the Doodle link below. Note that this is a collaborative run and so won't involve any bonus pay. https://doodle.com/poll/ikxcctsz78zk8cvt Thanks for pitching in! -Zach

25 Jan 2019 Friday 16:03 [Devon] 2019 Maintenance: 6007 hours. No problems inside the tank so no entry, but, 1588 hours and 2 years since last gas system maintenance. Opened the recirculator pig to find it coated with brass dust. Apparently the relief valve is operating some. The test pull handle on the seal bonnet is getting off axis and rubbing the hole in the spring tensioner cap. Wear spot indicates no appreciable axial travel, its like the bonnet is just tilting open a little on one side. Shop fabricated a Teflon bushing to try to keep the action on axis. Changed blower oil, greased motor and blower. Chain coupling was dry but not much wear on it and sprockets. Cleaned with WD40, re-installed. Scrubber cartridges serviced, all 3 sieves gained weight again, 5A by a factor of 10.7%, 4A by 9.1%, 3A by 11.2%. The idea of not going into the tank was a bust. The man door leaked badly on gas in even though it was never opened. The leak was bad enough to register on the VESDA O2 monitor in the pit and it never sealed by full tank pressure. So, entry. The chain 3 charging current lead is rock solid in the P clamp. The static chain measurements were as follows: C1= 1-7/8”, same as 1020 hours ago. C2 = 1-15/16”, also unchanged. C3 = 1”, a drop of 1/16” from 1020 hours ago. Chain 3 should have another 5/16” to go before hitting the alarm switch. With so little change in static measurement we skipped the running measurements. Meggered all resistors. Found one column resistor open, replaced. Odd that there were no signs of a bad resistor in last runs.

25 Jan 2019 Friday 12:43 [Devon] Cesium sputter source not working well with new 13C. Low yield, 1.5 uA, and unstable yield, periodic spikes in PS currents. Replenished Cs reservoir, very little left but not bone dry. Checked acc tube resistors, all good.

23 Jan 2019 Wednesday 11:20 [carter] The switches on the collimator current meter unit were cleaned with De-Oxit contact cleaner.

23 Jan 2019 Wednesday 11:19 [carter] Keithley picoammeter (beam current) meter switches cleaned and lubricated to repair difficult to rotate polarity switch. Also, replaced power supply filter capacitors in the unit.

09 Jan 2019 Wednesday 16:43 [carter] nmrgoto problem resolved, the filter capacitor in the 10 volt step pulse pull-up supply at the controller was bad causing large 60 Hz ripple on the step pulse pull up value resulting in a fraction of the step pulses being too small to step the stepping motot controller. Replaced the capacitor and now using the original nmrgoto command values with good results.

08 Jan 2019 Tuesday 15:47 [Devon] Pelletron hour meter reading 1/8/2019: 6007. Accelerator operating hours in 2018: 846.

02 Jan 2019 Wednesday 15:02 [Carter] Operators... Please remember to turn off the Ludlum dosimeter when shutting down the accelerator to conserve the batteries.

02 Jan 2019 Wednesday 11:45 [carter/jacobs] Quarterly alarm and shutdown tests complete for January 2019 by Carter/Jacobs. Modified the email section of the reminder program to reflect the recent domain change from ohiou.edu to ohio.edu so email reminders and acknowledge should work properly next quarter.

02 Jan 2019 Wednesday 11:14 [carter/jacobs] Tritium monitor repair, new diaphram, oil bearings and new air inlet filter.

23 Dec 2018 Sunday 09:21 [Devon] The tritium monitor pump was violently noisy. Turned the monitor off until we can work on it.

22 Dec 2018 Saturday 18:15 [Ingram] Power came back at 6:00 PM after second outage. I have switched the nitrogen bottle on the Keck system for a new one. I was doing that when the power came back on. That was the last full nitrogen bottle, we need to order one.

21 Dec 2018 Friday 16:53 [carter] The swinger BPO noise (high frequency RF at ~0.75 Hz repeating) nearly completely removed by removing the ground isolation feature of the inverting transformer used in the BPO circuit.

12 Dec 2018 Wednesday 13:22 [Devon] FM finally here to look at down chiller. (control cabinet had blown open on stormy, windy day. Got wet, shut down). They cleared the errors and re-started. Chiller appears to be undamaged.

06 Dec 2018 Thursday 11:09 [carter] The NMR command "nmrgoto" was missing its target so a "fudge" factor has been included in the command calculation to help get closer to the desired frequency. Diagnostics are continuing but a convenient workaround program named "nmrto" has been created that works the same as the mnrgoto command (enter a floating poingt frequency in MHz. for example "nmrto 8.627866") but will make multiple attempts to get close to the entered frequency and seems to work well, even better than before.

05 Dec 2018 Wednesday 08:04 [Ingram] Source camera not responding to movement controls, blue buttons.

01 Dec 2018 Saturday 11:37 [KB/RG] The E1 water and vacuum systems/phase failure detected alarm was going off a few minutes ago. Rekam and I (Kristyn) have acknowledged the alarm and checked to see if vacuum remained. We still have vacuum, so no further action is required.

26 Nov 2018 Monday 15:12 [Shift schedule for this week] Greetings Operators, Thanks for signing up for shifts this week. The resultant schedule is here: https://docs.google.com/spreadsheets/d/1IgQk3vepSmgd_0yMm9pDD1FSWhcT2CjqdMoR_9_W3vU/edit?usp=sharing -Zach

26 Nov 2018 Monday 13:40 [Shift sign-up for this week's ORNL run] Greetings Operators, Please fill-out the following Doodle poll if you can be an operator for this week's experiment: https://doodle.com/poll/kghxz8t728n88znt. As usual, we'll wind-up having one operator from 8-4 and two otherwise. I'm not sure if we'll be able to have overnight operation or not, but it would be good to know if this is possible. Just as a heads-up, this is a collaborative beam time [i.e. is intended to lead to a paper] so it isn't paid extra. Apologies for the late notice and thanks for your participation! -Zach

16 Nov 2018 Friday 11:32 [carter/Brandenburg] CMU experiment finished. 1.5 hours after the sputter source heaters were run down and temperatures had stabalized and were at shutdown temperatures, the Target Current had leveled off to 5 ma and was not falling. Target Current remaind at 5 ma for nearly an hour then source power supplies were shut down anyway.

06 Nov 2018 Tuesday 07:40 [Devon] VESDA: calibrated ECO O2 sensors

05 Nov 2018 Monday 15:31 [Availability for CMU experiment (doodle poll)] Greetings Operators, Next week, Tuesday November 13 - Friday November 16, George Perdikakis and Panos Gastis will be visiting the accelerator lab to run 40Ar(p,n). They are interested in running overnight, if we can manage. Please fill-out this Doodle poll within the next day or two so that I can look into setting up a schedule for the experiment. If you are only Operator 1 trained, please indicate this with a comment below the poll. Poll: https://doodle.com/poll/5vkvg8pn3i4qerk4 Thanks for your help. -Zach

05 Nov 2018 Monday 14:33 [Devon] A proton beam and Don will be available tomorrow, Tuesday, 11/6, after 10:00, for pulsing and bunching training and/or review. NMR training may also be a possibility if time permits. Those of you operators that need these skills should try to stop by. You can view your training status at: https://edwards2.phy.ohiou.edu/~oual/operators/operators.php

01 Nov 2018 Thursday 11:16 [carter] Test message in logbook

23 Oct 2018 Tuesday 15:23 [Devon] Process chiller is back in business. It was the tee fitting that sprung a leak. The flare on the fan differential switch capillary was fine. FM pumped all the gas out of the circuit to remove the tee, but on removal it was discovered that the port on the coil manifold has a Schrader valve. Any time we have trouble with fan diff switches we don't need to worry about removing gas from the circuit because the tees are on Schrader valves. The gas was put back in the circuit and we observed low pressure cycling at start up but then successful running. When the second circuit started and both fans ran the small circuit suffered low pressure cutouts. Both cases expected for low gas charge due to leak off. Added more gas to the small circuit and everything is working fine. Ambient temp was 62 today.

17 Oct 2018 Wednesday 08:18 [Devon] Sputter source: Cleaned. Tap hole for top bolt on target shroud stripped on first few threads, longer bolt with nut as spacer used. Airlock bolt at target power lead not threading well, may be time to replace lexan section. Cs oven re-used.

12 Oct 2018 Friday 14:05 [Yenuel Jones-Alberty] Completed Operator 2.

01 Oct 2018 Monday 11:45 [Devon] Process chiller update: small circuit ran with normal behavior most of the weekend, there was some short cycling during the peak heat of the days. It was running happily first thing Monday, I set the low pressure cutout back up to where it should be for 34F at the HX baffles. By 10am it was ambient warm enough to cause low pressure cutouts. Found the leak in the circuit, its at a small tee where the fan differential pressure switch ties in. I need some shop Doug consultation before laying wrench on it, may be wise to use the compressor to pump Freon into safe storage before taking a chance on breaking something. The small circuit is disabled for the time being. The middle and large circuits will handle our loads. The fan differential switch on the large circuit chattered at first use again (previous log story), seemed to settle down and hold contact after a short time.