Connection from IP address 3.230.119.106
Time: 2020 Sep 26 19:30:39
Found 2534 logbook entries, displaying most recent 100

Logbook Contents (Most Recent Entries)

25 Sep 2020 Friday 15:38 [Devon] Alphatross notes on disassembly: Iíve posted a drawing of the source on the handbook to help with any references below (why does the Comdoc always make a crooked scan?). Rb neutralized without much fanfare. The greatest reactions were in the vault during disassembly, but not enough to register on the VESDA fire alarm. Care and patience must be taken when removing the oven, the wire wick has lots of Rb that gets re-exposed as the wick is moved. The water tub outside was unremarkable. Not much Rb left in the oven, guessing maybe 20% or less of the initial charge. The plasma bottle has milky white coating between the RF bands which Iím thinking is an expected result. The insulator and exit canal seem to be in quite good shape. Still plan to use a fresh bottle and clean/align the probe assembly (gas end, items 28-36). The Al canal holder, item 20 (exit aperture) was again eroded off axis to the right. This is why I want to take a good look at the probe end of the bottle. The holder was not very caked with Rb. Next we get to the charge exchange chamber (CEC) entry cooling baffle (item 48), its aperture was well occluded, less than a quarter of the original diameter (6.4mm) by eye, and the remaining opening was off axis right. The CEC itself (all of item 17) didnít seem too bad, nothing like the ANSTO pictures on SNEAP. The entry aperture was about half occluded (nominally 4.8mm), and there was some Rb puddling at the base of the flange where it meets the entry cooling baffle. The CEC exit was interesting. The Source Exit Spacer (Stainless steel, item 3) has a much larger hole (12.75mm) and conically expands after the hole until it meets the titanium exit aperture (item 4) which has the same size hole. The idea is that Rb should condense on the exit aperture and flow back to the oven thru the drain hole in the bottom of the conical spacer as part of the Rb cycle. Some Rb had wicked into the contact gap between aperture plate and spacer, but the drain was open, so one would assume the cycle is working. Any Rb that escapes the exit aperture is confronted by the exit cooling baffle (item 52, 19mm diameter) and the large space between the source base plate (item 1) and the baffle plate. This space had a fair amount of Rb pooled in the bottom, the greatest concentration other than the oven. Rb that collects in this space is gone from the cycle. The next components of the source are the extractor/lens (focus) assembly followed by the acceleration tube (bias). Gap resistance was checked on these devices while the source was still under vacuum. The 300 MOhm resistor gaps on the acceleration tube measured 240 MOhm consistently. The 150 MOhm resistor gaps on the extractor measured 100 MOhm consistently. Didnít think I needed to check continuity btween the lens electrode and the adjacent extractor gaps. We re-checked resistivity after the source was vented to air. The acceleration gaps had now dropped to 80 MOhms and decreased continuously towards the CEC. The first extractor gap had dropped to 1 MOhm and the others got less moving towards the CEC. Checked the lens to the adjacent extractor plane closest to the CEC, 300 KOhms; adjacent plane further from the CEC, 600KOhms. Both of those measurements should have been infinite since the lens element is isolated. Just for fun, removed one 150 MOhm resistor, measured 149 MOhm. So, lots more cleaning and disassembly ahead of us.

25 Sep 2020 Friday 15:12 [Tom Massey] The Pu(Be) and 252Cf sources have been placed in the back of the tunnel. Kristyn is doing calibrations and needs a low neutron background.

24 Sep 2020 Thursday 13:59 [Devon] Alphatross notes prior to disassembly: 881.6 hours. Generally suffering from low beam output and instability. After the last power outage and Ar backfill the source sat under vacuum for several weeks of sputter source runs. Upon start up there was immediate plasma ignition with a pinkish hue. Source was left running in hopes of clean up, the pinkish hue faded to aqua quickly. He- was initially on the order of 100-300 nA in the LE cup with instabilities on the order of 5-10 Hz. After several days the output had increased to around 500 nA but the source had to be shutdown for sputter pellet change. On restart the plasma would not ignite, had to raise the gas to .5 sccm and raise the probe to 5 KV to get ignition. After another 4 days the current had increased to 800 nA with instability on the order of 1-2 Hz. During RBS work on day 5 the Probe was increased from 6 to 6.5 KV which gave an increase in beam reaching the RBS chamber. But from that point forward the beam suffered a steady downward slope for a few days until the output had reached 100 nA again, and the magnitude of the instabilities had increased, but not the frequency. Attempts at tuning couldnít produce any more than 150 nA at the peak of the instability cycle. The BPM showed a reasonable looking profile at times, but it was also swamped with baseline noise, the effect seen when ions strike the housing. In some cases the baseline noise would persist for many seconds after a voltage change in the system. Nothing left to do but tear down the sourceÖ

24 Sep 2020 Thursday 12:05 [carter] OIT has returned the portable phone for the vault claiming is is OK. I have returned it to its normal place over the swinger scope inside the vault door. We will see.

21 Sep 2020 Monday 14:53 [Gula Hamad] Note on BCI Calibration: BCI test was done using Both ranges 1E-06 and 1E-07 and we got the same result.

21 Sep 2020 Monday 14:33 [Gula Hamad] BCI Calibration: We did test the BCI by sending a known current and verifying the BCI reading. We calculated the measured charge from BCi = 5.97E-04 [C] and the Applied current = 6.00E-04 [C]. The ratio between charge from BCi to the Applied current = 0.9955

19 Sep 2020 Saturday 13:46 [Ingram] Alphatross note: I saw that the probe was at 6.0 kV. I decided to increase it to 6.5 kV. The beam on target ( I am taking data) increased, it doubled from 10 nA to 20 nA.

18 Sep 2020 Friday 12:59 [carter] With reference to the buncher no output issue, I decided to double check that the tank switch was indeed in position 2, rotated the switch completely around and back to position 2, the position we wanted for alphas. Re checked the operation. Saw a glimmer of 5 MHZ on the output and tuned the output tune control many turns and found the resonance, so it appears that either the tube selector switch was not completely in position or possibly that we don't frequently run in position 2 and it needs to be re-tuned significantly to resonate. Anyway, it appears that the buncher is again OK and tuned for the 16 cm bunch tube. Pulsed beam should now again be possible.

18 Sep 2020 Friday 11:15 [carter] The portable phone that was located in the vault has been picked up by OIT for diagnostics and repair. There is no phone at that location now so use the portable from the control room if phone service in that area is needed until further notice.

18 Sep 2020 Friday 11:10 [carter] The buncher has developed a failure overnight. Restricted access diagnosis is a defective output tube screen power supply. DC operations can continue with the machine as scheduled. Maintenance on the buncher is scheduled for Sept 30 unless an opportunity presents itself and the sources are down before that date.

17 Sep 2020 Thursday 09:12 [Devon] Magnet Primary pump running. Resume schedule.

16 Sep 2020 Wednesday 15:49 [Devon] A viable bearing assembly for the magnet pump was found in the shop. Still has bearings, yay. Hope to have the existing pump up and running tomorrow, for as long as the motor lasts.

16 Sep 2020 Wednesday 15:45 [Devon] Additional videos have been added to the bottom of the handbook page. There is a video of navigating the control room camera station and a startup and shutdown video for each source. Enjoy.

15 Sep 2020 Tuesday 15:55 [Devon] The Magnet Primary cooling pump failed and is unrepairable. Attempted to install a new shaft seal and coupling but wear and pitting were too bad to get a seal. This was only going to be temporary anyway due to severe slop in motor bearings. Checking on price and lead time for a replacement...

15 Sep 2020 Tuesday 11:29 [Devon] Magnet Primary water pump failed. Attempting rebuild...

14 Sep 2020 Monday 16:22 [carter] Capacitor in LE tube vacuum gauge was shorting and was replaced. 0.5 uF 4000 VDC. Last spare on the shelf but have a complete spare gauge power supply unit that was removed from old duoplasmatron source as a supply of spares.

11 Sep 2020 Friday 11:51 [carter] Analyzing magnet power supply would not run up. Problem traced to the collector mount screw on Q-7 that had loosened, probably because of thermal cycling. Will add star locking washers to these screws to help prevent this.

05 Sep 2020 Saturday 14:39 [Ingram] pellet changed to 12C. Left source gate valve closed.

04 Sep 2020 Friday 16:43 [Devon] The zero gauge reading was on the suction side of the comfort chilled water pump. The make up regulator was stuck and there was a leak in the Trane chiller. The regulator set point was exorcised and is working again. The leak was a small valve with a cracked body feeding an air bleeder inside the chiller. Closing the valve stopped the leak for now. There is a work order to replace the cracked valve.

04 Sep 2020 Friday 11:23 [Ingram] Beam instability back so that I have switched to GVM control. This coincided with instabilty in the extractor current in the alphtross.

04 Sep 2020 Friday 10:40 [Ingram] Water in the mechcanical room above the control room is coming from three sources. Water from the HVAC air handler, as usual. Water from a roof leak probably from the rain yeasterday giving a pool of water around the water heater. This is dripping very slowly through to the control room and onto the table close to my laptop, that is why I noticed. The third source is in the inner room around the water pump. The blue cylinder connected to the water pump is sweating alot. Also one of the water gauges connected to the HVAC pump is reading zero.

04 Sep 2020 Friday 10:36 [Ingram] Alphatross producing about 0.7 uA LE cup. Stable. Running 10 nA on target and taking RBS and PIXE data. Things of note about the alphatross, to me, Einzel lens, Focus Voltage and both steerers are at zero volts. They either have no effect on the beam or in the case of the steerers, reduce the current. No obvious reason why the beam current has grown over time or why the beam is now more stable.

03 Sep 2020 Thursday 12:04 [carter] Replaced V6 6AH6 120 Hz drive tube in the NMR to restore the full horizontal sweep in the 120 Hz position. Adjusted the sweep gain to match the 60 Hz.

02 Sep 2020 Wednesday 15:47 [carter] Created a wtchdog timer for the accelerator logging system. If the logging fails to update the tandem.time file over a 5 minute period, the system will automatically restart the acelerator logging program.

02 Sep 2020 Wednesday 08:20 [carter] Looks like accelerator logging system stopped at 2:23:54 AM this morning, possibly power glitch that shut off power to sputter source HV platform? Anyway, restarted the logging system at 8:12 this morning. Looks like it is working OK now.

31 Aug 2020 Monday 08:39 [Devon] The front door is being replaced this morning.

28 Aug 2020 Friday 12:18 [carter] The alphatross computer has completed the new disc image. The new image was installed as the current system disk, the old one retired as a backup disc. The new system has been updated to the current centos7 version 7.8.2003. Tandemwatch and inflection controls restored to normal.

27 Aug 2020 Thursday 12:41 [carter] I have begun an image backup of the alphatross computer prior to applying system updates for Centos7. The inflection magnet control is available on the tandem computer and the tandemwatch (downcharge monitor program) is displaying on the congrol room ddaq computer. I will restore the alphatross computer to normal operation Monday AM.

24 Aug 2020 Monday 15:20 [Zach Meisel] Operators needed (week of September 7): Greetings operators, Alexander will be running 12C on Mg targets in the charged-particle time-of-flight chamber on R65 to study the statistical properties of nuclides in this region. He would like operator help to do this. If possible, we will try for overnight runs. These runs will mostly involve sitting at a single energy and letting the data come in. Please fill-out this Doodle poll to indicate your availability: https://doodle.com/poll/uwrhze3nnkada3sb. Thanks for your help! -Zach

24 Aug 2020 Monday 12:52 [Cody Parker] Came in to stop the overnight TexAT calibration and the SF6 alarm was going off. I lowered the set point slightly and the alarm stopped. I checked the tank pressure and temperature, and both have dropped some. I talked to Don on his way to the LTR and he will monitor the plots.

23 Aug 2020 Sunday 20:25 [Cody Parker/Jack Bishop] We have completed the 12C(n,n2) and 16O(n,a) runs using TexAT! Thank you to everyone for all of your help! We are working on a calibration source run with TexAT overnight, and plan to start the ~week-long process of disassembly and packing tomorrow. The D2 gas cell is still pressurized and the water cooling is on. All other accelerator-related equipment and the sputter source have been shut down.

23 Aug 2020 Sunday 00:20 [Devon] VESDA minor smoke event in the small target room. Definite smell of something burned, but no obvious source, detection returned to baseline. Will have to be on the lookout for something not working in there. Came in to reset the fire alarm, experiment resuming.

12 Aug 2020 Wednesday 14:07 [carter] Trane replaced other temperature sensor today and both circuits are said to be OK and running now.

11 Aug 2020 Tuesday 16:14 [Devon] The gas is in and drying. The accelerator is ready to run tomorrow as long as the AC stays on.

11 Aug 2020 Tuesday 11:49 [Devon] Chiller update: A factory tech was here this morning. He happened to have a water temperature sensor. It has been installed and we should be back to half a chiller. They identified another bad sensor that they did not have on hand. Will be back tomorrow late morning or early afternoon to install the other sensor. People will have to be on the look out for the factory tech, and pause the run or survey the roof, and let him in the roof gate to make the repairs. I have started to evacuate the accelerator tank. Gas transfer will be done by 5 pm if the door seal doesn't leak.

11 Aug 2020 Tuesday 07:17 [Devon] The Facilities work center page is still not functioning on VPN. The issue was reported to OIT yesterday morning. There was an urgent work order for the chiller in early July that was never addressed. I can't obtain that work order number until I get to campus.

11 Aug 2020 Tuesday 07:13 [Devon] So the chiller was completely dead by around 7 pm last night. First person in the lab today needs to call Facilities and report a chiller emergency, and stand by to let in the technician. I won't be there until 9:45ish. From what I discussed with the technician yesterday, a reliable cure for this chiller is not certain and certainly not timely. The thing is a lemon. Management from both organizations need to discuss a timeline, consider installation of a portable, temporary chiller, and discuss the disposition of our out-of-state visiting researchers.

10 Aug 2020 Monday 14:48 [Devon] Facilities Management was here most of the day. Both halves of the chiller are still running at this moment. There is still a problem such that the measured water temperature in the unit and the actual water temperature are different. They will order new sensors. But its running. Plan is to transfer gas tomorrow after operator class.

10 Aug 2020 Monday 11:53 [Devon] Tank Opening: 7173 hours. We observed a sudden onset of noise in the LE Tube downcharge while running at 2.7 MV. We entered the tank expecting to find an open resistor or broken connecting spring. We found neither. We started the process of looking back at logged data. The onset of the noise was related to the tube entrance lens being driven to a voltage above the terminal induced voltage of the downcharge on plane 4 where the lens is. We investigated the performance of just the lens with vacuum in the tube but 1 atm air in the tank. The lens voltage and current were stable and giving the expected values. There is a spark gap on the lens feed path. The points of the gap were dirty and sparked at around 8 KV. We insulated the gap with Teflon sheet and ran at around 15 KV without instability, confirming that the supply and wiring seemed to be ok. A review of the prior month data showed that the noise had been intermittently present when the lens was driven above the induced voltage, or when the lens had been left on while the accelerator is off (donít leave electrostatic devices on!). Given the compulsion to do SOMETHING while the tank was open, decided to clean the spark gap with sandpaper and kimwipes. Nothing else to do with respect to this problem. We will have to monitor the noise behavior going forward. It had also been a year since the bearing disaster. A year is the target timeframe for greasing bearings, so that was done. No other maintenance due to schedule pressure.

10 Aug 2020 Monday 06:34 [carter] Same thing for me, says not on VPN but I am also.

10 Aug 2020 Monday 06:17 [Devon] VPN test. Facilities web page says I'm not on VPN, page won't work. VPN says connected, this page works...

07 Aug 2020 Friday 09:48 [Devon] During the monthly safety inspection, found the vault phone to be severely locked up. Had to remove the battery. Seems to be OK now. Radiation?

05 Aug 2020 Wednesday 16:26 [Tom Massey] We were running at 2.5 MV on the terminal today. Devon noticed that the LE current has been jumpy. This did not change when the LE cup was put in. These excursions seemed to reduce in size with time. The changes were most visible on the Tandem watch screen.

30 Jul 2020 Thursday 09:41 [Ingram] The driveway entrance is blocked this morning. If you need to come into the building either walk from Baker or enter by the second floor door from the footpath from University Terrace.

30 Jul 2020 Thursday 09:39 [Ingram] Both fume hoods have been checked by the lab safety contractor for proper operation and are working normally.

30 Jul 2020 Thursday 07:16 [carter] A part of the repairs made yesterday involved a temporary work-around of a failed transformer. I will spare the technical details but I would ask the operators to limit the range of operation of the low energy 2-Y steerer. This is the 10-turn pot steerer we use in conjunction with setting up for pulsed beam operation. Zero deflection occurs at 5.0 on the dial. Normal operation occurs between 6.0 and 3.0 so I ask to restrict the settings to not go outside of the normal range of 6.0 to 2.5. If you feel a need to go outside of this restricted range, please consult me first. Thanks, don

29 Jul 2020 Wednesday 18:05 [carter] Front door found not latched again, please try to check when you leave or enter and make sure it closes and latches behind you. Last week I locked it 8 times in 2 days.

29 Jul 2020 Wednesday 17:42 [Devon] FYI, all the videos are at the very bottom of the handbook page. At this moment, I'm finding that the longer videos are not playing well, both on public network and VPN. They take a very long time to buffer and then the playback is still awful choppy. Don had this experience while others of us did not, inconsistent performance reports. Perhaps the inpp/edwards2 server is not set up to stream well when multiple people are viewing? Apparently We need to find a more robust way to serve these videos. In the mean time, if a video is not playing well for you, try "save target as" and download it to your device to watch later? Please keep us posted on any problems...

29 Jul 2020 Wednesday 17:28 [carter] The 400 volt chopper power supply has been repaired. It's power transformer will need to be replaced in the future but a temporary repair has been made. After that repair it was also discovered that the lower chopper pulse drive system had blown 16 difficult to replace transistors. Those transistors have also been replaced and as of 5:00PM I believe the chopping system is again functional so pulsed beam operation tomorrow can be attempted.

29 Jul 2020 Wednesday 17:01 [Tom Massey] The Pu(Be) neutron sources are in the wall safe. The sources which have too high an activity have been placed at the back of the tunnel. The source room how is less than 0.1 mr/hr.

28 Jul 2020 Tuesday 18:28 [carter] Chopping / LE steering problem traced to one of the 400 volt chopper supplies that should be an isolated floating supply has a path to ground that shouldn't be there, effectively connecting that chopping / steering electrode to ground. Will begin supply removal and repair tomorrow morning. Hopefully can run sometime tomorrow afternoon.

28 Jul 2020 Tuesday 08:18 [Devon] Lets try something new in the COVID remote environment. There is now a video on the handbook of a sputter source target pellet change. For those of you who wish to be signed off on this capability - read the procedure while you step thru the video. You can then tell me it all makes perfect sense, or we can discuss any details that need clarified until it all makes perfect sense, and I will add this skill to your training record. I must point out that the video is a pellet change on a non-running source. The procedure is written for a pellet change on a running source and assumes that you are comfortable with the source controls. Based on the content of the video you should be able to identify which steps to skip on a non-running source, or, which steps require source operator skills on a running source. Don't forget to link, in you mind, this process with the new source area entry/exit video.

25 Jul 2020 Saturday 16:28 [Ingram] Power is back on. Alarms reset. AC working. Nothing obviously bad. The emergency generator and lights worked, I was in this morning to check on the Kratos N2 bottle. It is now down to 1000 psi from 2000 psi, so it will survive a few more short outages but no more long ones:)

24 Jul 2020 Friday 13:42 [Tom Massey] Physical Plant came and shut off the steam valve to the ac/heating system in the upstairs mechanical room.

23 Jul 2020 Thursday 08:49 [carter] The IN/OUT board should be thought of a classical system, it should indicate the current state of your presence in the lab. It seems it is being used as a quantum system where it describes the probability you might be found IN/OUT of the lab. Please treat the IN/OUT board as a classical system and update accordingly, including comments so others can plan their work.

23 Jul 2020 Thursday 07:15 [Ingram] Can you please remove comments from the in/out log that are not relevant anymore? Also, if you are not in then the in/out board should reflect that.

22 Jul 2020 Wednesday 11:35 [Devon] The LN2 dewar is filled

22 Jul 2020 Wednesday 10:06 [Devon] VESDA O2 sensors 6 month calibration done. Windows updates applied to VESDA computer.

20 Jul 2020 Monday 16:51 [Ingram] I have at last put up the new lists of contact phone numbers on the front door, at the door to the restricted area, and in the control room. Let me know of any errors or omissions. David Ingram ingram@ohio.edu

17 Jul 2020 Friday 14:13 [Tom Massey] The short term stablity of the alphatross as greatly improved. The current is varying on a longer time scale now. It is now fairly easy to tune.

15 Jul 2020 Wednesday 14:43 [carter] At the time the alphatross beam became more stable, the logging showed a spike in vacuum, went from 1.8e-6 to 2.0e-6 then slowly began dropping. The Ext_Current and Bias_Currents became much more stable while the very small voltage ripple (<0.5V) of the supplies remained unchanged.

15 Jul 2020 Wednesday 14:16 [Tom Massey] The alphatross beam has now settled down and is stable! It is now much easier to tune!

14 Jul 2020 Tuesday 09:44 [Tom Massey] The neutron sources are all in the tunnel. They will be returned to the source room following this experiment. This should be Monday July 20, 2020.

13 Jul 2020 Monday 10:52 [carter] Test of send logbook message to all operators function after modification.

13 Jul 2020 Monday 10:51 [Carter] Dave, This is a test to see if you have been added correctly to our logbook email list. If you receive this email, please send an email to carter@ohio.edu that indicates you received the email. Thanks, don

09 Jul 2020 Thursday 10:25 [carter] DRD values at quarterly check reset. Console=1.78 Roaming=.04

09 Jul 2020 Thursday 10:24 [CARTER] Quarterly safety checks done, carter/voinov

09 Jul 2020 Thursday 07:26 [Ingram] If you take a flashlight out of the box just inside the door of the control room please put it back there when you return to the control room. Just like any other general purpose tool, we need to share flashlights. Like any tool, they have a place they are stored when not in use which is where we look first. Please be considerate of others and put tools back in the place where they are stored so others may find them efficiently. David Ingram

07 Jul 2020 Tuesday 10:09 [Devon] Sputter source: Abruptly shutdown last night in conjunction with both water level and water flow alarms. Came in this morning to find a cooling line had come off the source and the loop had pumped itself dry, water all over the floor. Exactly as predicted in the emergency procedure book, protective systems functioned as expected. Cooling loop is refilled and source is back on. We are out of distilled water and very low on distilled/deionized water in the TFL, need a campaign of water processing...

05 Jul 2020 Sunday 14:35 [Tom Massey] The neutron sources have been returned to the source room.

30 Jun 2020 Tuesday 15:07 [Tom Massey] The alphatross has been giving 800 to 900 nA at the low enrgy cup. There are fluctuations in the beam. These fluctuations are showing up as a change in the X-Profile also on the R65 beam leg.

30 Jun 2020 Tuesday 09:16 [Devon] 2X and 2Y are off. Since the tics appear in the source cup it could be Probe, Extractor, Focus, or Bias, or source steerers.

30 Jun 2020 Tuesday 08:40 [Carter] From logging looks like some ticks are coincident with ticks in probe current. Another note, yesterday Kristyn suspected Y movement of beam ar source. We turned off the 2Y and 2X steerer power suppliessince they werenít needed. Are they still off?

30 Jun 2020 Tuesday 08:18 [Devon] Alphatross: We left the source running overnight. The beam has increased but developed a periodic tic. Bouncing between 800 and 900 nA. The tic is also present in the source faraday cup which is measuring 4.5 uA negative beam. ??

29 Jun 2020 Monday 14:53 [Tom Massey] All Pu(Be) and Cf-252 sources have been put in the tunnel for Kristyn's experiment.

26 Jun 2020 Friday 11:52 [Devon] Alphatross: New plasma components installed. The fiber optic module on the source deck is plugged into regular building AC power in order to flow Helium thru the system for the weekend as a clean up. The source is not usable in this configuration. I'm not sure about the viability of the rubidium charge. Even though Ar was freely flowing out of the source during the first repair attempt, the Rb could be seen bubbling around the aperture to the Rb chamber. Then there was a small leak of air during pump down. The high vacuum pump down was slow and never quite reached what we had seen as baseline (high 10**-8) while we waited for parts. Today the Rb chamber entrance was white and mostly occluded. Poked it with an allen wrench to open up the hole, little fire balls flew, really reactive stuff. We won't know until we get it up to operating temperatures next week.

25 Jun 2020 Thursday 13:42 [Tom Massey] Seth Waldron from Life checked all of the fire exinguishers in the building. All CO2 were within 5 years of hydro testing and all Chemical were within 6 years of hydro testing.

23 Jun 2020 Tuesday 13:04 [Devon] Alphatross: The source developed a condition yesterday where the Probe current would run away (>8 mA) in the presence of just the plasma, no probe voltage. 350 hours of operation. A visual inspection showed that the quartz plasma bottle was coated with a milky white substance and the boron nitride insulator was plated with dark material. The assumption was that the plating was allowing too much current to reach the grounded Ta canal behind the insulator. The plan today was to replace the bottle, insulator, and canal while openly flowing Ar to protect the Rubidium. While removing the used bottle, the aluminum aperture behind the Ta canal also came out. The hole in this aperture had been plated on one side and sputtered away on the other side resulting in a severely off-axis aperture. We were not given any spare apertures with the source order. We were given 2 plasma bottles and 2 sets of insulator/canals. I was about to use 1 new bottle and the last insulator/canal but could not proceed with this aperture. I called NEC. They said the aperture is considered a wear item, they have 500+ in stock. They had no comment on the fact that it wore so bad after several hundred hours. We had a $1300 credit with them, so I ordered 6 apertures, 2 sets of insulator/canals, and another glass bottle. They should ship today. The source is back under vacuum while we wait for parts to complete the repair.

23 Jun 2020 Tuesday 10:42 [carter] The previous fix for DRDaccum didn't work. I have now moved the DRDaccum file to /var/www/html/DRDaccum with ownership of apache.apache. This seems to be working OK now. I also made a symbolic link to /var/www/html/DRDaccum in /home/carter for easy access.

18 Jun 2020 Thursday 15:18 [Tom Massey] All of the neutron sources have been put in the tunnel to reduce the neutron background for the current experiment. They will be returned to the Source Room following the experiment.

14 Jun 2020 Sunday 16:15 [carter] Left lab at 2:30 but posted message at 4:00

11 Jun 2020 Thursday 10:16 [carter] Attempted to correct permissions issue with /home/carter on control1. It seems that in order to allow passwordless logins from alphatross.oual.ohiou.edu to copy the alphatross data to control1, the directory /home/carter/ on control1 must have permissions 700. Conflicting, to allow apache httpd to write the DRDaccum file from the accelerator header webpage, the /home/carter/ directory permissions need to be 777. To allow the logging, I have modified /home/carter/ permissions to 700 and moved the DRDaccum file to /var/www/cgi-bin/ and modified the file /var/www/cgi-bin/tandem_log to reflect this location change. I have copied the old DRDaccum file to /var/www/cgi-bin/DRDaccum and also to a backup DRDaccum_11Jun2020. I have also created a symbolic link in /home/carter/DRDaccum the points to the new file location.

10 Jun 2020 Wednesday 14:03 [Devon] I made a collection of videos of alphatross operation. I hope to combine them into 1 video, but either way, I'm ready to try a teams training session next week. The source had all the signs of contamination after the long rest and numerous power outages. It only gave 300 nA of 4He, had sizable Oxygen peaks, and the settings were not what we had began to consider normal. It will need run for a few days to clean up.

10 Jun 2020 Wednesday 09:43 [Donald Carter] Hallways being waxed today so access to the lab may be limited.

08 Jun 2020 Monday 16:04 [carter] Left lab at 2:30 but posted message at 4:00

08 Jun 2020 Monday 16:01 [carter] Leaving lab, back Tuesday 9 AM

08 Jun 2020 Monday 12:05 [carter] In lab, RM 105, control room, R-65 Found front door open at noon.

08 Jun 2020 Monday 10:45 [Devon] Operator 1 test demo

08 Jun 2020 Monday 06:58 [Ingram] Leaving lab, back later this morning to check on Kratos

08 Jun 2020 Monday 06:44 [Ingram] Entering lab to work in LTR

06 Jun 2020 Saturday 10:37 [Ingram] Leaving lab

06 Jun 2020 Saturday 10:31 [Ingram] Back in LTR

05 Jun 2020 Friday 17:21 [Ingram] Leaving lab

05 Jun 2020 Friday 17:15 [Ingram] Back in LTR

05 Jun 2020 Friday 06:55 [Ingram] Leaving lab. Crates for addition are in driveway but you can drive around them.

05 Jun 2020 Friday 06:47 [Ingram] Working in LTR, Kratos XPS system

04 Jun 2020 Thursday 19:38 [Ingram] Leaving lab, back in the morning

04 Jun 2020 Thursday 19:31 [Ingram] Back in lab, working in LTR.

04 Jun 2020 Thursday 17:57 [Ingram] Leaving the lab

04 Jun 2020 Thursday 15:37 [Ingram] Back in lab, LTR Kratos

Connection from IP address 3.230.119.106
Time: 2020 Sep 26 19:30:39
Found 2534 logbook entries, displaying most recent 100

Logbook Contents (Most Recent Entries)

25 Sep 2020 Friday 15:38 [Devon] Alphatross notes on disassembly: Iíve posted a drawing of the source on the handbook to help with any references below (why does the Comdoc always make a crooked scan?). Rb neutralized without much fanfare. The greatest reactions were in the vault during disassembly, but not enough to register on the VESDA fire alarm. Care and patience must be taken when removing the oven, the wire wick has lots of Rb that gets re-exposed as the wick is moved. The water tub outside was unremarkable. Not much Rb left in the oven, guessing maybe 20% or less of the initial charge. The plasma bottle has milky white coating between the RF bands which Iím thinking is an expected result. The insulator and exit canal seem to be in quite good shape. Still plan to use a fresh bottle and clean/align the probe assembly (gas end, items 28-36). The Al canal holder, item 20 (exit aperture) was again eroded off axis to the right. This is why I want to take a good look at the probe end of the bottle. The holder was not very caked with Rb. Next we get to the charge exchange chamber (CEC) entry cooling baffle (item 48), its aperture was well occluded, less than a quarter of the original diameter (6.4mm) by eye, and the remaining opening was off axis right. The CEC itself (all of item 17) didnít seem too bad, nothing like the ANSTO pictures on SNEAP. The entry aperture was about half occluded (nominally 4.8mm), and there was some Rb puddling at the base of the flange where it meets the entry cooling baffle. The CEC exit was interesting. The Source Exit Spacer (Stainless steel, item 3) has a much larger hole (12.75mm) and conically expands after the hole until it meets the titanium exit aperture (item 4) which has the same size hole. The idea is that Rb should condense on the exit aperture and flow back to the oven thru the drain hole in the bottom of the conical spacer as part of the Rb cycle. Some Rb had wicked into the contact gap between aperture plate and spacer, but the drain was open, so one would assume the cycle is working. Any Rb that escapes the exit aperture is confronted by the exit cooling baffle (item 52, 19mm diameter) and the large space between the source base plate (item 1) and the baffle plate. This space had a fair amount of Rb pooled in the bottom, the greatest concentration other than the oven. Rb that collects in this space is gone from the cycle. The next components of the source are the extractor/lens (focus) assembly followed by the acceleration tube (bias). Gap resistance was checked on these devices while the source was still under vacuum. The 300 MOhm resistor gaps on the acceleration tube measured 240 MOhm consistently. The 150 MOhm resistor gaps on the extractor measured 100 MOhm consistently. Didnít think I needed to check continuity btween the lens electrode and the adjacent extractor gaps. We re-checked resistivity after the source was vented to air. The acceleration gaps had now dropped to 80 MOhms and decreased continuously towards the CEC. The first extractor gap had dropped to 1 MOhm and the others got less moving towards the CEC. Checked the lens to the adjacent extractor plane closest to the CEC, 300 KOhms; adjacent plane further from the CEC, 600KOhms. Both of those measurements should have been infinite since the lens element is isolated. Just for fun, removed one 150 MOhm resistor, measured 149 MOhm. So, lots more cleaning and disassembly ahead of us.

25 Sep 2020 Friday 15:12 [Tom Massey] The Pu(Be) and 252Cf sources have been placed in the back of the tunnel. Kristyn is doing calibrations and needs a low neutron background.

24 Sep 2020 Thursday 13:59 [Devon] Alphatross notes prior to disassembly: 881.6 hours. Generally suffering from low beam output and instability. After the last power outage and Ar backfill the source sat under vacuum for several weeks of sputter source runs. Upon start up there was immediate plasma ignition with a pinkish hue. Source was left running in hopes of clean up, the pinkish hue faded to aqua quickly. He- was initially on the order of 100-300 nA in the LE cup with instabilities on the order of 5-10 Hz. After several days the output had increased to around 500 nA but the source had to be shutdown for sputter pellet change. On restart the plasma would not ignite, had to raise the gas to .5 sccm and raise the probe to 5 KV to get ignition. After another 4 days the current had increased to 800 nA with instability on the order of 1-2 Hz. During RBS work on day 5 the Probe was increased from 6 to 6.5 KV which gave an increase in beam reaching the RBS chamber. But from that point forward the beam suffered a steady downward slope for a few days until the output had reached 100 nA again, and the magnitude of the instabilities had increased, but not the frequency. Attempts at tuning couldnít produce any more than 150 nA at the peak of the instability cycle. The BPM showed a reasonable looking profile at times, but it was also swamped with baseline noise, the effect seen when ions strike the housing. In some cases the baseline noise would persist for many seconds after a voltage change in the system. Nothing left to do but tear down the sourceÖ

24 Sep 2020 Thursday 12:05 [carter] OIT has returned the portable phone for the vault claiming is is OK. I have returned it to its normal place over the swinger scope inside the vault door. We will see.

21 Sep 2020 Monday 14:53 [Gula Hamad] Note on BCI Calibration: BCI test was done using Both ranges 1E-06 and 1E-07 and we got the same result.

21 Sep 2020 Monday 14:33 [Gula Hamad] BCI Calibration: We did test the BCI by sending a known current and verifying the BCI reading. We calculated the measured charge from BCi = 5.97E-04 [C] and the Applied current = 6.00E-04 [C]. The ratio between charge from BCi to the Applied current = 0.9955

19 Sep 2020 Saturday 13:46 [Ingram] Alphatross note: I saw that the probe was at 6.0 kV. I decided to increase it to 6.5 kV. The beam on target ( I am taking data) increased, it doubled from 10 nA to 20 nA.

18 Sep 2020 Friday 12:59 [carter] With reference to the buncher no output issue, I decided to double check that the tank switch was indeed in position 2, rotated the switch completely around and back to position 2, the position we wanted for alphas. Re checked the operation. Saw a glimmer of 5 MHZ on the output and tuned the output tune control many turns and found the resonance, so it appears that either the tube selector switch was not completely in position or possibly that we don't frequently run in position 2 and it needs to be re-tuned significantly to resonate. Anyway, it appears that the buncher is again OK and tuned for the 16 cm bunch tube. Pulsed beam should now again be possible.

18 Sep 2020 Friday 11:15 [carter] The portable phone that was located in the vault has been picked up by OIT for diagnostics and repair. There is no phone at that location now so use the portable from the control room if phone service in that area is needed until further notice.

18 Sep 2020 Friday 11:10 [carter] The buncher has developed a failure overnight. Restricted access diagnosis is a defective output tube screen power supply. DC operations can continue with the machine as scheduled. Maintenance on the buncher is scheduled for Sept 30 unless an opportunity presents itself and the sources are down before that date.

17 Sep 2020 Thursday 09:12 [Devon] Magnet Primary pump running. Resume schedule.

16 Sep 2020 Wednesday 15:49 [Devon] A viable bearing assembly for the magnet pump was found in the shop. Still has bearings, yay. Hope to have the existing pump up and running tomorrow, for as long as the motor lasts.

16 Sep 2020 Wednesday 15:45 [Devon] Additional videos have been added to the bottom of the handbook page. There is a video of navigating the control room camera station and a startup and shutdown video for each source. Enjoy.

15 Sep 2020 Tuesday 15:55 [Devon] The Magnet Primary cooling pump failed and is unrepairable. Attempted to install a new shaft seal and coupling but wear and pitting were too bad to get a seal. This was only going to be temporary anyway due to severe slop in motor bearings. Checking on price and lead time for a replacement...

15 Sep 2020 Tuesday 11:29 [Devon] Magnet Primary water pump failed. Attempting rebuild...

14 Sep 2020 Monday 16:22 [carter] Capacitor in LE tube vacuum gauge was shorting and was replaced. 0.5 uF 4000 VDC. Last spare on the shelf but have a complete spare gauge power supply unit that was removed from old duoplasmatron source as a supply of spares.

11 Sep 2020 Friday 11:51 [carter] Analyzing magnet power supply would not run up. Problem traced to the collector mount screw on Q-7 that had loosened, probably because of thermal cycling. Will add star locking washers to these screws to help prevent this.

05 Sep 2020 Saturday 14:39 [Ingram] pellet changed to 12C. Left source gate valve closed.

04 Sep 2020 Friday 16:43 [Devon] The zero gauge reading was on the suction side of the comfort chilled water pump. The make up regulator was stuck and there was a leak in the Trane chiller. The regulator set point was exorcised and is working again. The leak was a small valve with a cracked body feeding an air bleeder inside the chiller. Closing the valve stopped the leak for now. There is a work order to replace the cracked valve.

04 Sep 2020 Friday 11:23 [Ingram] Beam instability back so that I have switched to GVM control. This coincided with instabilty in the extractor current in the alphtross.

04 Sep 2020 Friday 10:40 [Ingram] Water in the mechcanical room above the control room is coming from three sources. Water from the HVAC air handler, as usual. Water from a roof leak probably from the rain yeasterday giving a pool of water around the water heater. This is dripping very slowly through to the control room and onto the table close to my laptop, that is why I noticed. The third source is in the inner room around the water pump. The blue cylinder connected to the water pump is sweating alot. Also one of the water gauges connected to the HVAC pump is reading zero.

04 Sep 2020 Friday 10:36 [Ingram] Alphatross producing about 0.7 uA LE cup. Stable. Running 10 nA on target and taking RBS and PIXE data. Things of note about the alphatross, to me, Einzel lens, Focus Voltage and both steerers are at zero volts. They either have no effect on the beam or in the case of the steerers, reduce the current. No obvious reason why the beam current has grown over time or why the beam is now more stable.

03 Sep 2020 Thursday 12:04 [carter] Replaced V6 6AH6 120 Hz drive tube in the NMR to restore the full horizontal sweep in the 120 Hz position. Adjusted the sweep gain to match the 60 Hz.

02 Sep 2020 Wednesday 15:47 [carter] Created a wtchdog timer for the accelerator logging system. If the logging fails to update the tandem.time file over a 5 minute period, the system will automatically restart the acelerator logging program.

02 Sep 2020 Wednesday 08:20 [carter] Looks like accelerator logging system stopped at 2:23:54 AM this morning, possibly power glitch that shut off power to sputter source HV platform? Anyway, restarted the logging system at 8:12 this morning. Looks like it is working OK now.

31 Aug 2020 Monday 08:39 [Devon] The front door is being replaced this morning.

28 Aug 2020 Friday 12:18 [carter] The alphatross computer has completed the new disc image. The new image was installed as the current system disk, the old one retired as a backup disc. The new system has been updated to the current centos7 version 7.8.2003. Tandemwatch and inflection controls restored to normal.

27 Aug 2020 Thursday 12:41 [carter] I have begun an image backup of the alphatross computer prior to applying system updates for Centos7. The inflection magnet control is available on the tandem computer and the tandemwatch (downcharge monitor program) is displaying on the congrol room ddaq computer. I will restore the alphatross computer to normal operation Monday AM.

24 Aug 2020 Monday 15:20 [Zach Meisel] Operators needed (week of September 7): Greetings operators, Alexander will be running 12C on Mg targets in the charged-particle time-of-flight chamber on R65 to study the statistical properties of nuclides in this region. He would like operator help to do this. If possible, we will try for overnight runs. These runs will mostly involve sitting at a single energy and letting the data come in. Please fill-out this Doodle poll to indicate your availability: https://doodle.com/poll/uwrhze3nnkada3sb. Thanks for your help! -Zach

24 Aug 2020 Monday 12:52 [Cody Parker] Came in to stop the overnight TexAT calibration and the SF6 alarm was going off. I lowered the set point slightly and the alarm stopped. I checked the tank pressure and temperature, and both have dropped some. I talked to Don on his way to the LTR and he will monitor the plots.

23 Aug 2020 Sunday 20:25 [Cody Parker/Jack Bishop] We have completed the 12C(n,n2) and 16O(n,a) runs using TexAT! Thank you to everyone for all of your help! We are working on a calibration source run with TexAT overnight, and plan to start the ~week-long process of disassembly and packing tomorrow. The D2 gas cell is still pressurized and the water cooling is on. All other accelerator-related equipment and the sputter source have been shut down.

23 Aug 2020 Sunday 00:20 [Devon] VESDA minor smoke event in the small target room. Definite smell of something burned, but no obvious source, detection returned to baseline. Will have to be on the lookout for something not working in there. Came in to reset the fire alarm, experiment resuming.

12 Aug 2020 Wednesday 14:07 [carter] Trane replaced other temperature sensor today and both circuits are said to be OK and running now.

11 Aug 2020 Tuesday 16:14 [Devon] The gas is in and drying. The accelerator is ready to run tomorrow as long as the AC stays on.

11 Aug 2020 Tuesday 11:49 [Devon] Chiller update: A factory tech was here this morning. He happened to have a water temperature sensor. It has been installed and we should be back to half a chiller. They identified another bad sensor that they did not have on hand. Will be back tomorrow late morning or early afternoon to install the other sensor. People will have to be on the look out for the factory tech, and pause the run or survey the roof, and let him in the roof gate to make the repairs. I have started to evacuate the accelerator tank. Gas transfer will be done by 5 pm if the door seal doesn't leak.

11 Aug 2020 Tuesday 07:17 [Devon] The Facilities work center page is still not functioning on VPN. The issue was reported to OIT yesterday morning. There was an urgent work order for the chiller in early July that was never addressed. I can't obtain that work order number until I get to campus.

11 Aug 2020 Tuesday 07:13 [Devon] So the chiller was completely dead by around 7 pm last night. First person in the lab today needs to call Facilities and report a chiller emergency, and stand by to let in the technician. I won't be there until 9:45ish. From what I discussed with the technician yesterday, a reliable cure for this chiller is not certain and certainly not timely. The thing is a lemon. Management from both organizations need to discuss a timeline, consider installation of a portable, temporary chiller, and discuss the disposition of our out-of-state visiting researchers.

10 Aug 2020 Monday 14:48 [Devon] Facilities Management was here most of the day. Both halves of the chiller are still running at this moment. There is still a problem such that the measured water temperature in the unit and the actual water temperature are different. They will order new sensors. But its running. Plan is to transfer gas tomorrow after operator class.

10 Aug 2020 Monday 11:53 [Devon] Tank Opening: 7173 hours. We observed a sudden onset of noise in the LE Tube downcharge while running at 2.7 MV. We entered the tank expecting to find an open resistor or broken connecting spring. We found neither. We started the process of looking back at logged data. The onset of the noise was related to the tube entrance lens being driven to a voltage above the terminal induced voltage of the downcharge on plane 4 where the lens is. We investigated the performance of just the lens with vacuum in the tube but 1 atm air in the tank. The lens voltage and current were stable and giving the expected values. There is a spark gap on the lens feed path. The points of the gap were dirty and sparked at around 8 KV. We insulated the gap with Teflon sheet and ran at around 15 KV without instability, confirming that the supply and wiring seemed to be ok. A review of the prior month data showed that the noise had been intermittently present when the lens was driven above the induced voltage, or when the lens had been left on while the accelerator is off (donít leave electrostatic devices on!). Given the compulsion to do SOMETHING while the tank was open, decided to clean the spark gap with sandpaper and kimwipes. Nothing else to do with respect to this problem. We will have to monitor the noise behavior going forward. It had also been a year since the bearing disaster. A year is the target timeframe for greasing bearings, so that was done. No other maintenance due to schedule pressure.

10 Aug 2020 Monday 06:34 [carter] Same thing for me, says not on VPN but I am also.

10 Aug 2020 Monday 06:17 [Devon] VPN test. Facilities web page says I'm not on VPN, page won't work. VPN says connected, this page works...

07 Aug 2020 Friday 09:48 [Devon] During the monthly safety inspection, found the vault phone to be severely locked up. Had to remove the battery. Seems to be OK now. Radiation?

05 Aug 2020 Wednesday 16:26 [Tom Massey] We were running at 2.5 MV on the terminal today. Devon noticed that the LE current has been jumpy. This did not change when the LE cup was put in. These excursions seemed to reduce in size with time. The changes were most visible on the Tandem watch screen.

30 Jul 2020 Thursday 09:41 [Ingram] The driveway entrance is blocked this morning. If you need to come into the building either walk from Baker or enter by the second floor door from the footpath from University Terrace.

30 Jul 2020 Thursday 09:39 [Ingram] Both fume hoods have been checked by the lab safety contractor for proper operation and are working normally.

30 Jul 2020 Thursday 07:16 [carter] A part of the repairs made yesterday involved a temporary work-around of a failed transformer. I will spare the technical details but I would ask the operators to limit the range of operation of the low energy 2-Y steerer. This is the 10-turn pot steerer we use in conjunction with setting up for pulsed beam operation. Zero deflection occurs at 5.0 on the dial. Normal operation occurs between 6.0 and 3.0 so I ask to restrict the settings to not go outside of the normal range of 6.0 to 2.5. If you feel a need to go outside of this restricted range, please consult me first. Thanks, don

29 Jul 2020 Wednesday 18:05 [carter] Front door found not latched again, please try to check when you leave or enter and make sure it closes and latches behind you. Last week I locked it 8 times in 2 days.

29 Jul 2020 Wednesday 17:42 [Devon] FYI, all the videos are at the very bottom of the handbook page. At this moment, I'm finding that the longer videos are not playing well, both on public network and VPN. They take a very long time to buffer and then the playback is still awful choppy. Don had this experience while others of us did not, inconsistent performance reports. Perhaps the inpp/edwards2 server is not set up to stream well when multiple people are viewing? Apparently We need to find a more robust way to serve these videos. In the mean time, if a video is not playing well for you, try "save target as" and download it to your device to watch later? Please keep us posted on any problems...

29 Jul 2020 Wednesday 17:28 [carter] The 400 volt chopper power supply has been repaired. It's power transformer will need to be replaced in the future but a temporary repair has been made. After that repair it was also discovered that the lower chopper pulse drive system had blown 16 difficult to replace transistors. Those transistors have also been replaced and as of 5:00PM I believe the chopping system is again functional so pulsed beam operation tomorrow can be attempted.

29 Jul 2020 Wednesday 17:01 [Tom Massey] The Pu(Be) neutron sources are in the wall safe. The sources which have too high an activity have been placed at the back of the tunnel. The source room how is less than 0.1 mr/hr.

28 Jul 2020 Tuesday 18:28 [carter] Chopping / LE steering problem traced to one of the 400 volt chopper supplies that should be an isolated floating supply has a path to ground that shouldn't be there, effectively connecting that chopping / steering electrode to ground. Will begin supply removal and repair tomorrow morning. Hopefully can run sometime tomorrow afternoon.

28 Jul 2020 Tuesday 08:18 [Devon] Lets try something new in the COVID remote environment. There is now a video on the handbook of a sputter source target pellet change. For those of you who wish to be signed off on this capability - read the procedure while you step thru the video. You can then tell me it all makes perfect sense, or we can discuss any details that need clarified until it all makes perfect sense, and I will add this skill to your training record. I must point out that the video is a pellet change on a non-running source. The procedure is written for a pellet change on a running source and assumes that you are comfortable with the source controls. Based on the content of the video you should be able to identify which steps to skip on a non-running source, or, which steps require source operator skills on a running source. Don't forget to link, in you mind, this process with the new source area entry/exit video.

25 Jul 2020 Saturday 16:28 [Ingram] Power is back on. Alarms reset. AC working. Nothing obviously bad. The emergency generator and lights worked, I was in this morning to check on the Kratos N2 bottle. It is now down to 1000 psi from 2000 psi, so it will survive a few more short outages but no more long ones:)

24 Jul 2020 Friday 13:42 [Tom Massey] Physical Plant came and shut off the steam valve to the ac/heating system in the upstairs mechanical room.

23 Jul 2020 Thursday 08:49 [carter] The IN/OUT board should be thought of a classical system, it should indicate the current state of your presence in the lab. It seems it is being used as a quantum system where it describes the probability you might be found IN/OUT of the lab. Please treat the IN/OUT board as a classical system and update accordingly, including comments so others can plan their work.

23 Jul 2020 Thursday 07:15 [Ingram] Can you please remove comments from the in/out log that are not relevant anymore? Also, if you are not in then the in/out board should reflect that.

22 Jul 2020 Wednesday 11:35 [Devon] The LN2 dewar is filled

22 Jul 2020 Wednesday 10:06 [Devon] VESDA O2 sensors 6 month calibration done. Windows updates applied to VESDA computer.

20 Jul 2020 Monday 16:51 [Ingram] I have at last put up the new lists of contact phone numbers on the front door, at the door to the restricted area, and in the control room. Let me know of any errors or omissions. David Ingram ingram@ohio.edu

17 Jul 2020 Friday 14:13 [Tom Massey] The short term stablity of the alphatross as greatly improved. The current is varying on a longer time scale now. It is now fairly easy to tune.

15 Jul 2020 Wednesday 14:43 [carter] At the time the alphatross beam became more stable, the logging showed a spike in vacuum, went from 1.8e-6 to 2.0e-6 then slowly began dropping. The Ext_Current and Bias_Currents became much more stable while the very small voltage ripple (<0.5V) of the supplies remained unchanged.

15 Jul 2020 Wednesday 14:16 [Tom Massey] The alphatross beam has now settled down and is stable! It is now much easier to tune!

14 Jul 2020 Tuesday 09:44 [Tom Massey] The neutron sources are all in the tunnel. They will be returned to the source room following this experiment. This should be Monday July 20, 2020.

13 Jul 2020 Monday 10:52 [carter] Test of send logbook message to all operators function after modification.

13 Jul 2020 Monday 10:51 [Carter] Dave, This is a test to see if you have been added correctly to our logbook email list. If you receive this email, please send an email to carter@ohio.edu that indicates you received the email. Thanks, don

09 Jul 2020 Thursday 10:25 [carter] DRD values at quarterly check reset. Console=1.78 Roaming=.04

09 Jul 2020 Thursday 10:24 [CARTER] Quarterly safety checks done, carter/voinov

09 Jul 2020 Thursday 07:26 [Ingram] If you take a flashlight out of the box just inside the door of the control room please put it back there when you return to the control room. Just like any other general purpose tool, we need to share flashlights. Like any tool, they have a place they are stored when not in use which is where we look first. Please be considerate of others and put tools back in the place where they are stored so others may find them efficiently. David Ingram

07 Jul 2020 Tuesday 10:09 [Devon] Sputter source: Abruptly shutdown last night in conjunction with both water level and water flow alarms. Came in this morning to find a cooling line had come off the source and the loop had pumped itself dry, water all over the floor. Exactly as predicted in the emergency procedure book, protective systems functioned as expected. Cooling loop is refilled and source is back on. We are out of distilled water and very low on distilled/deionized water in the TFL, need a campaign of water processing...

05 Jul 2020 Sunday 14:35 [Tom Massey] The neutron sources have been returned to the source room.

30 Jun 2020 Tuesday 15:07 [Tom Massey] The alphatross has been giving 800 to 900 nA at the low enrgy cup. There are fluctuations in the beam. These fluctuations are showing up as a change in the X-Profile also on the R65 beam leg.

30 Jun 2020 Tuesday 09:16 [Devon] 2X and 2Y are off. Since the tics appear in the source cup it could be Probe, Extractor, Focus, or Bias, or source steerers.

30 Jun 2020 Tuesday 08:40 [Carter] From logging looks like some ticks are coincident with ticks in probe current. Another note, yesterday Kristyn suspected Y movement of beam ar source. We turned off the 2Y and 2X steerer power suppliessince they werenít needed. Are they still off?

30 Jun 2020 Tuesday 08:18 [Devon] Alphatross: We left the source running overnight. The beam has increased but developed a periodic tic. Bouncing between 800 and 900 nA. The tic is also present in the source faraday cup which is measuring 4.5 uA negative beam. ??

29 Jun 2020 Monday 14:53 [Tom Massey] All Pu(Be) and Cf-252 sources have been put in the tunnel for Kristyn's experiment.

26 Jun 2020 Friday 11:52 [Devon] Alphatross: New plasma components installed. The fiber optic module on the source deck is plugged into regular building AC power in order to flow Helium thru the system for the weekend as a clean up. The source is not usable in this configuration. I'm not sure about the viability of the rubidium charge. Even though Ar was freely flowing out of the source during the first repair attempt, the Rb could be seen bubbling around the aperture to the Rb chamber. Then there was a small leak of air during pump down. The high vacuum pump down was slow and never quite reached what we had seen as baseline (high 10**-8) while we waited for parts. Today the Rb chamber entrance was white and mostly occluded. Poked it with an allen wrench to open up the hole, little fire balls flew, really reactive stuff. We won't know until we get it up to operating temperatures next week.

25 Jun 2020 Thursday 13:42 [Tom Massey] Seth Waldron from Life checked all of the fire exinguishers in the building. All CO2 were within 5 years of hydro testing and all Chemical were within 6 years of hydro testing.

23 Jun 2020 Tuesday 13:04 [Devon] Alphatross: The source developed a condition yesterday where the Probe current would run away (>8 mA) in the presence of just the plasma, no probe voltage. 350 hours of operation. A visual inspection showed that the quartz plasma bottle was coated with a milky white substance and the boron nitride insulator was plated with dark material. The assumption was that the plating was allowing too much current to reach the grounded Ta canal behind the insulator. The plan today was to replace the bottle, insulator, and canal while openly flowing Ar to protect the Rubidium. While removing the used bottle, the aluminum aperture behind the Ta canal also came out. The hole in this aperture had been plated on one side and sputtered away on the other side resulting in a severely off-axis aperture. We were not given any spare apertures with the source order. We were given 2 plasma bottles and 2 sets of insulator/canals. I was about to use 1 new bottle and the last insulator/canal but could not proceed with this aperture. I called NEC. They said the aperture is considered a wear item, they have 500+ in stock. They had no comment on the fact that it wore so bad after several hundred hours. We had a $1300 credit with them, so I ordered 6 apertures, 2 sets of insulator/canals, and another glass bottle. They should ship today. The source is back under vacuum while we wait for parts to complete the repair.

23 Jun 2020 Tuesday 10:42 [carter] The previous fix for DRDaccum didn't work. I have now moved the DRDaccum file to /var/www/html/DRDaccum with ownership of apache.apache. This seems to be working OK now. I also made a symbolic link to /var/www/html/DRDaccum in /home/carter for easy access.

18 Jun 2020 Thursday 15:18 [Tom Massey] All of the neutron sources have been put in the tunnel to reduce the neutron background for the current experiment. They will be returned to the Source Room following the experiment.

14 Jun 2020 Sunday 16:15 [carter] Left lab at 2:30 but posted message at 4:00

11 Jun 2020 Thursday 10:16 [carter] Attempted to correct permissions issue with /home/carter on control1. It seems that in order to allow passwordless logins from alphatross.oual.ohiou.edu to copy the alphatross data to control1, the directory /home/carter/ on control1 must have permissions 700. Conflicting, to allow apache httpd to write the DRDaccum file from the accelerator header webpage, the /home/carter/ directory permissions need to be 777. To allow the logging, I have modified /home/carter/ permissions to 700 and moved the DRDaccum file to /var/www/cgi-bin/ and modified the file /var/www/cgi-bin/tandem_log to reflect this location change. I have copied the old DRDaccum file to /var/www/cgi-bin/DRDaccum and also to a backup DRDaccum_11Jun2020. I have also created a symbolic link in /home/carter/DRDaccum the points to the new file location.

10 Jun 2020 Wednesday 14:03 [Devon] I made a collection of videos of alphatross operation. I hope to combine them into 1 video, but either way, I'm ready to try a teams training session next week. The source had all the signs of contamination after the long rest and numerous power outages. It only gave 300 nA of 4He, had sizable Oxygen peaks, and the settings were not what we had began to consider normal. It will need run for a few days to clean up.

10 Jun 2020 Wednesday 09:43 [Donald Carter] Hallways being waxed today so access to the lab may be limited.

08 Jun 2020 Monday 16:04 [carter] Left lab at 2:30 but posted message at 4:00

08 Jun 2020 Monday 16:01 [carter] Leaving lab, back Tuesday 9 AM

08 Jun 2020 Monday 12:05 [carter] In lab, RM 105, control room, R-65 Found front door open at noon.

08 Jun 2020 Monday 10:45 [Devon] Operator 1 test demo

08 Jun 2020 Monday 06:58 [Ingram] Leaving lab, back later this morning to check on Kratos

08 Jun 2020 Monday 06:44 [Ingram] Entering lab to work in LTR

06 Jun 2020 Saturday 10:37 [Ingram] Leaving lab

06 Jun 2020 Saturday 10:31 [Ingram] Back in LTR

05 Jun 2020 Friday 17:21 [Ingram] Leaving lab

05 Jun 2020 Friday 17:15 [Ingram] Back in LTR

05 Jun 2020 Friday 06:55 [Ingram] Leaving lab. Crates for addition are in driveway but you can drive around them.

05 Jun 2020 Friday 06:47 [Ingram] Working in LTR, Kratos XPS system

04 Jun 2020 Thursday 19:38 [Ingram] Leaving lab, back in the morning

04 Jun 2020 Thursday 19:31 [Ingram] Back in lab, working in LTR.

04 Jun 2020 Thursday 17:57 [Ingram] Leaving the lab

04 Jun 2020 Thursday 15:37 [Ingram] Back in lab, LTR Kratos