OUAL Electronic Logbook

Connection from IP address 18.216.32.116
Time: 2024 Apr 24 1:54:24
Found 2834 logbook entries, displaying most recent 100

Logbook Contents (Most Recent Entries)

22 Apr 2024 Monday 10:01 [carter] Control1 and firewall computers imaged to new 500 GB SSD's and old discs retired and new SD's installed. 22 April 2024.

16 Apr 2024 Tuesday 14:56 [carter] Re-aligned NMR range switch coupling and cleaned contacts with Deoxit contact cleaner. Seems o be woking OK now.

12 Apr 2024 Friday 10:45 [carter] Test entry adding Andrea and Cody to "all operators" logbook email checkbox list.

12 Apr 2024 Friday 10:43 [carter] Test logbook entry with send to Cody and Andrea checkbox checked.

01 Apr 2024 Monday 15:31 [Leblanc, Parker, Richard, Rambo, Derkin, Jeswald, Carter] Quarterly Safety Check Operator DRD: 4.75 Secondary DRD: 0.01

28 Mar 2024 Thursday 09:30 [Joseph Derkin] This morning I observed the R45 cryopump near switching wall had failed. Televac ion gauge controller was not responding, and the cryopump was heavily frosted over. I opened up the roughing valve to the cryopump, unplugged the cryo from the compressor, and turned on a fan.

08 Mar 2024 Friday 14:52 [carter] Sputter source water level alarm readjusted to proper intensity value to compensate for bulb ageing.

12 Feb 2024 Monday 14:57 [carter] Added an entry in /etc/rc.local to automatically at boot run the shell script to set stty parameters for magnet programs. It is /home/carter/bin/stty_setup and will need to be run at least once after reboot. To see current options "sudo stty -F /dev/ttyS[0,4,5] -a".

23 Jan 2024 Tuesday 12:16 [Carter, Leblanc] Recalibrated inflection magnet settings logger this morning. Logged magnet current logged value was lower than actual value. Multiplied old value by 1.183 to obtain readings that match with the readout of the set current in the inflection magnet controls. Last night currents were reading around 0.83A, actual value was 0.99A.

18 Jan 2024 Thursday 17:13 [Leblanc] Ion gauge in the HE beam leg (between HE gate valve and analyzer magnet is off, and the filament appears to be burn out. No running possible until it's replaced. Cesium sputter source left off, though it is ready to run.

02 Jan 2024 Tuesday 15:02 [Tom Massey] Quarterly check DRD last reading 2.71

30 Dec 2023 Saturday 16:05 [Leblanc] VESDA trouble with minor low air flow pipe 2 on the DOCK VLS. Tried cleaning out the pipe from either end, but it didn't fix the problem. Normalized the air flow using the VSM software, and that appears to have cleared the error.

29 Dec 2023 Friday 13:17 [Tom Massey] The VESPA touble cleared itself. The system is normal now.

29 Dec 2023 Friday 12:33 [Tom Massey] Vespa trouble alarm. The screen shows "DOCK VLS - Minor Air flow piep 2"

07 Dec 2023 Thursday 09:32 [Leblanc] Radiation monitor for the vault went off because I unhooked it. Facilities guys had scaled the scaffolding and needed to move it 2', but the radiation monitor was in the way and the wires were behind the scaffold. I removed the wires but before they finished that work, my alarm to leave for class went off and I left without reconnecting it. The alarms didn't go off because the rate wasn't high enough during the remaining 3 hours of the 8-4 shift to trigger the alarm. Detector reconnected to the system and accidental shutdown log filled out. Accelerator paper logbook also updated with brief information.

07 Dec 2023 Thursday 08:52 [Ingram] Shutdown alarm going off. No obvious source of radaition. Chart shows steady increase in recroded level that does not appear on the meters.

29 Nov 2023 Wednesday 15:28 [carter] Shell script to set stty parameters for magnet programs is /home/carter/bin/stty_setup and will need to be run at least once after reboot. To see current options "sudo stty -F /dev/ttyS[0,4,5] -a". Also now prevent left click below zero and also now do tcflush(fd,TCIOFLUSH) after opening device.

17 Nov 2023 Friday 18:01 [Leblanc] Sputter source maintenance today. Symptoms leading to service were low D+ beam currents and target current < 2mA. Expectation was to find Cs depleted. Inspection found that Cs was OK, but the source was quite dirty with sputtered material. Many parts of the source also showed discoloration from high temperatures. Bead blasted many internal components, cleaned, and reassembled. Added an additional 5g of Cs to reservoir. Left system pumping with ion gauge reading mid-10^-5. Settings logger restarted. Ionizer left at about 10A/3.5V. Gate valve to low energy extension leaked during Ar backfill of the source. Regenerated LE cryopump. Didn't have good enough vacuum to turn on the ion gauge before leaving, but pump was recovering.

03 Nov 2023 Friday 09:31 [Leblanc, Warren] Alphatross source wasn't responding this morning. Alphatross shortcut did not start the software, even after rebooting the PC. Invoking alphatross from the command line revealed "no route to host". Inspection found no link-light on the blue cable on the alphatross switch. This cable terminates in the control room behind the console. All 3 UPS units on the shelf were off, causing the alphatross switch to be without power. The front 2 UPS units started without issue. The rear tripplite unit would not start, but only appears to be powering Alexander Voinov's USB external disk. Left the third UPS alone for now.

02 Nov 2023 Thursday 00:32 [Joseph Derkin] The last thing we did tonight was perform an energy change to 5.1 MeV, and the source started to show strong fluctuations. This made tuning extremely difficult, we were only able to achieve 10nA max before calling it for the night. I logged the accelerator settings and am leaving the alpha source on at Greg's direction. We will need to investigate the source output in the morning, I was measuring fluctuations from 0 - 400 nA at the HE cup. I did try tuning on the inflection magnet, einzel lens, and "focus voltage" with no success. CMU would like to start at 5.1 MeV again in the morning.

24 Oct 2023 Tuesday 16:56 [Joseph Derkin] Shutdown module went off while machine was running, E2 alarm indicating sub loop temp warning. Don and I investigated and the secondary loop inlet is reading 0 psi, and the outlet reads 50 psi. Secondary loop temp reading 82 F. Control power left off until tomorrow.

20 Oct 2023 Friday 16:07 [Leblanc] Leak found on Helium supply line for analyzer cryo-pump using sniffer mode on the leak checker. Spare line retrieved from LTR spares and installed temporarily. Need to work on re-routing when accelerator downtime permits. High energy and analyzer cryo-pump gate valves are closed and the pumps turned off. Cryo-compressor is running to circulate helium through the lines and remove any impurities. Analyzer leg left on roughing vacuum to avoid leakage into R45. Plan is to rough out the two cryos on Monday and recover vacuum.

20 Oct 2023 Friday 09:23 [Ingram] HE compressor has lost He again. Swicher pump is sweating. I have shut off the compressor. I am trying to save the vacuum in 45R which is about 1E-6 by roughing on the switcher beam line as the pump warms up.

17 Oct 2023 Tuesday 10:52 [Leblanc et. al] Operators DRD Accumulated dose 0.72mRem Guest DRD accumulated dose 0.07mRem

09 Oct 2023 Monday 16:26 [Ingram] We have confirmed the gate valve between the switcher and the 45R beamline is leaking when it is closed. Venting 45R caused an immediate pressure rise to off-scale on the tc gauge monitoring the beamline between the switcher and the analyzer magnets. For now both the 45R and switcher/analyzer sections need to be maintained at the same vacuum level or one will cause problems for the other.

06 Oct 2023 Friday 12:00 [Joseph Derkin] I replaced one filament on the nude ion gauge on R45. Both of the old filaments were measured as an open loop. The ion gauge controller was checked with the test gauge and confirmed to be in working condition. One of the spare filaments was already broken in the box, and I did not find any other spares. The R45 section of beam pipe near the switcher magnet wall was vented to atmosphere at 10:50am. The gauge has been reinstalled and is roughing down now.

03 Oct 2023 Tuesday 15:11 [Ingram] The LE cryopumps are working again. The HE cryopumps are shutdown until Greg can do some maintenance on them. The accelerator will not to be used until that happens.

03 Oct 2023 Tuesday 11:52 [Ingram] HE cryopump compressor needs helium. It is reading 0 psi running and 25 when stopped.

02 Oct 2023 Monday 15:15 [Ingram] Vacuum failure between the analyzer and the switcher. It has affected the LE cryopumps. All pumps regenerating.

15 Sep 2023 Friday 17:00 [carter] The inflection magnet power supply has been moved from the vault to the small target room with the other power supplies. The inflection magnet polarity is currently set for Alphas, For hopefully a short period, the polarity needs to be switched manually. Contact Don or Greg before you run if it needs to be changed.

15 Sep 2023 Friday 10:30 [carter] Control1 image backup complete and web services restored.

14 Sep 2023 Thursday 10:34 [carter] Because of the many modifications to the accelerator control computer to implement the new Heinzinger power supplies (control1), I am planning on doing an image backup of the system starting this afternoon and will probably last overnight. The control1 computer will not be available over this time, likely done sometime tomorrow AM. Since the computer will be in single user mode for the backup, some OUAL webpages (eg. realtime logging, handbook, etc.) will be unavailable until this has finished. If this will be a problem for anyone, try to let me know by 3:00 PM today, otherwise I will start the backup.

06 Sep 2023 Wednesday 11:56 [carter/leblanc] Quad1A transient response has been adjusted and now is much more stable. Still can be made to oscillate on large jumps, like the others. Tolerates much quicker movement than before though.

06 Sep 2023 Wednesday 11:53 [carter/leblanc] All dipole magnets are now connected to the new Heinzinger power supplies. Restart buttons have been modified to start the Heinzinger control software, Polarity switching is done using the "Deflection" button to toggle the magnet polarity. Deflection direction is reported on the "Magnet Current" line of the software. Report any problems to don. The only analog panel meter that is connected is the switcher. Currently no analog meter on the analyzer of the swinger.

21 Aug 2023 Monday 19:49 [Joseph Derkin] Glassman power supplies not turning on for Cs sputter source after pellet installation. I ensured that both HV source doors were closed and the indicator lights were on. I tried the "boost" button with no success. Greg suggested that I try leaving the HV source door open for several minutes to let the solonoid cool down, and this also did not work.

17 Aug 2023 Thursday 16:16 [carter/leblanc] Alphatross performance after leak checking 4He plumbing and replacing one small section of plastic plumbing resulted in 10 nA of oxygen and 550 nA of 4He beam.

17 Aug 2023 Thursday 12:45 [carter] A "Fine" terminal voltage adjustment control has been added to the NEC Terminal Potential Stabilizer that allows very fine adjustments to tne "Terminal Voltage" control with a full range of 1.5 KV. This control is labeled "Fine" and is located coaxial to the "Bias Current" control.

15 Aug 2023 Tuesday 17:31 [carter] We are now using the new Heinzinger magnet power supplies for both the analyzing magnet and the switching magnet, a dedicated power supply for each magnet. Polarity switching is handled in the software GUI using the "Deflection" button. The old HVEC magnet power supply is now dedicated to the swinger magnet. We are no longer using the large polarity switch located by the switcher nor are we using the "Null" circuit breaker located by the analyzing magnet. The old HVEC magnet supply we were using for the analyzer/swinger should not be switched from the SWING position and is only used to power the swinger magnet now.. New instructions will be written for the accelerator handbook but until then, see Don or Greg for magnet power supply instruction and setup.

14 Aug 2023 Monday 14:59 [Leblanc] Installed 0.032 inch canal and insulator. Increased probe voltage by 125V every 5 seconds to 6kV. No initial spike in probe current. Probe current at 2.5mA when probe reached 6kV. After 20 minutes, probe current rose to 3.5 to 3.6mA.

14 Aug 2023 Monday 13:00 [Leblanc] Insulator and canal combination of 0.024 inches resulted in very high initial probe currents. Peak was over 6.5mA. Steady state reached in about 5 minutes of 2.5 to 2.75 mA. Replaced with 0.029 inch gap insulator and canal combination. Again high currents observed initially. Current decayed to 2.0 to 2.5 mA after about 5 minutes.

14 Aug 2023 Monday 10:45 [Leblanc] Alphatross testing continues. Friday installed new canal and insulator with gap measured at 0.004 inches. Initial probe current around 1.85mA which decayed to 1.4mA after 20 minutes. Increased magnet current to 4.5A which resulted in an increase in probe current to 1.55mA. Still below target of 2.0mA. Replaced with canal and insulator gap measured at 0.024 inches.

08 Aug 2023 Tuesday 07:40 [carter] The Accelerator Handbook WIKI now contains a section for dipole magnet setup instructions. The instructions are contained on the Accelerator Start-up page, section 5. titled "Dipole Magnet Setup Instructions".

01 Aug 2023 Tuesday 17:18 [Leblanc] Many VESDA warnings last night, almost exclusively Minor low air flow pipe 2 on the DOCK VLS. Disconnected this pipe and cleaned with the shop vac. Cleaned the pipes on the control room VESDA in the mechanical room. This required removing the pipe clamps holding the conduit in place. Set off the fire alarm doing this, but it was in local-only mode so fire department visit. I suspect that the excessive levels of dust in the mechanical room got stirred up either when turning on the shopvac or when disconnecting the pipe. Try to remember to clean up around the vesda before working on these pipes next time.

26 Jul 2023 Wednesday 11:54 [carter] Terminal potential stabilizer repaired. Likely cause was a terminal spark to the corona points that caused the failure of IC11, an OP-14 OP Amp in the Corona Triode Control board located at the tank in the Corona Probe Controller assembly.

25 Jul 2023 Tuesday 17:33 [carter] While changing energy, terminal was observed to go from ~375KV to ~500KV when control gain was lowered, something happened, maybe a spark to corona points, and now corona grid voltage is always indicating -15 volts. Will investigate tomorrow.

25 Jul 2023 Tuesday 17:13 [Tom Massey] We had a problem with the Termianal Potenetial Stablizer. We were running at 0.372 MeV and had run for 2 hours at this energy. I turned the control gain down. The Terminal Voltage went to over 0.5 MV. This tripped the overvoltage protection. The Grid Voltage is now stuck at -15 V. The concensus is that there may have been a spark to the corona points and this may have damaged some of this electronics. The corona current was notice to be very high before this happened.

25 Jul 2023 Tuesday 16:41 [carter] While using the crane in the Large Target Room today, I was raising the lift hook and there was a loud bang/noise and a yellow flash up by the drive motor on the trolley. I have turned off the breaker for the crane and put notices on the breaker and the control pendant that it is out of order. Turned on the LTR exhaust fan to vent any smoke and will investigate further tomorrow. Do not use the crane.

18 Jul 2023 Tuesday 11:20 [Ingram] The accelerator is running but with a beam and an energy that will not produce ionizing radiation on the roof or the mechanical room on the second floor. The work by facilities on the HVAC system can proceed while the accelerator is operating like this. David Ingram Dir. Edwards Accelerator Lab.

18 Jul 2023 Tuesday 10:57 [carter] Test of OUAL Logbook "Mail to Crystal Brooks" checkbox

18 Jul 2023 Tuesday 10:24 [Tom Massey] HVAC work today. Descaling is in progress. The leaking section will be evacuated, checked for leaks and recharged. This is expected to take the rest to the day.

17 Jul 2023 Monday 10:27 [Leblanc] HVAC work complete for Monday. OU HVAC team will return Tuesday at 6AM to flush the heater core to try to remove scale that is effecting heat exchanger efficiency. Trane technician is working on a quote to service loop one and replace leaking fittings and leak check. Trane tech will recommend refurbishment of chiller unit replacing compressors, heat exchangers, instrumentation, etc. Refurbishment carries a 5 year warranty. More information once I have feedback from OU HVAC.

17 Jul 2023 Monday 08:08 [Leblanc] Trane and OHIO HVAC technicians are on the roof this morning, troubleshooting our comfort chiller.

16 Jul 2023 Sunday 05:06 [Ingram] EPS system reporting Sysem Perifial Trouble Zone 401. Visusal check shows nothing. OUPD report cameras are not working.

13 Jul 2023 Thursday 16:58 [carter] I believe the unstable output issue of the buncher has been reolved and we should be OK to go tomorrow with the buncher.

30 Jun 2023 Friday 20:18 [leblanc] Mike from facilities HVAC arrived about 6 PM tonight to diagnose the comfort chiller. After some diagnostics and cleaning the chiller is operating, but not properly. Circuit 1 continues to drop out on "loss of charge". Circuit 2 is operating with extremely high (>400PSI) discharge pressure. Loaned a roof key to Mike so that he can check it in the morning, and see if the problem is likely heat related or refrigerant related. He will also try to get a Trane technican here next week to determine the course of action.

30 Jun 2023 Friday 15:07 [Justin Warren] The comfort chiller failed at approximately 12:30 PM and temperatures have risen considerably in the experimental area and control room. I've got a significant leakage current on the large target chamber as well (~ -2 nA). The accelerator has been shut down at this current time but the sputter source remains operational. Comfort chiller temperature according to the web log is approximately 78 F as of 15:06

28 Jun 2023 Wednesday 07:19 [Ingram] The Vesda system is showing an alert after reporting trouble from the small target room/control room system. I cannot see or smell a problem.

08 Jun 2023 Thursday 10:47 [Tom Massey] The control power was off when David Ingram and Justin Waren came in. There was no obvious cause to this. The air/water system showed clear. The vacuum gauge added on the high energy extension was operating in a normal range. This was assumed to be a transient and the control power was turned back on.

08 Jun 2023 Thursday 08:52 [Ingram] Vesda pipe 1 is reporting trouble intermittantly. It probably has a fluff bunny in it.

02 Jun 2023 Friday 14:49 [Leblanc] Shielding door from the vault to the loading doc was acting up today. After some searching around, found that the drive sprocket was partially disengaged from the gearbox. Removed sprocket and chain for cleaning. Will reinstall on Monday.

22 May 2023 Monday 09:14 [Ingram] Recovery from the power outage. Alarms reset and silenced. Water pumps turned on - not sure the primary loop pump is on. Suspect HVAC not working - air is muggy.

12 May 2023 Friday 16:36 [carter] Greg, Kate and I tested the power transformer in the disassembled HVEC analyzer magnet supply for the possibility of using the input taps on it connected as an auto-transformer, going in with 480 vac on the outer winding and using the lower voltage tap as a step-down auto-transformer to drop the 480 vac input to the required 360-440 vac. The test revealed that with 480 vac on the HI tap, we get 414 vac on the LOW tap, quite appropriate for our use in powering the new Heinzinger supplies. This will allow us connecting all of the new Heinzinger supplies up using the variac and transformer from the old analyzer magnet supply only.

10 May 2023 Wednesday 17:28 [carter] The first run using the new Heinzinger magnet power supply on the switcher magnet occurred today. Alexander ran a 6Li+3 beam at 3Mv on terminal, R65 degree leg. Switcher seemed stable and was running at ~106 Amps. The test of the dual DAC for fine and coarse control seemed to work well also.

20 Apr 2023 Thursday 21:12 [Bikash Chauhan] the aluminated light on the cups went out and the beam current was off. There was no terminal voltage. Mike called Greg. WE were able to get the lights glowing in the cups. As we were trying to increase theb charging voltage, the terminal voltage kept fluctuating on its own. As we increase the charging voltage, the sum current in tandom watch spike down. We then shut down the accelerator.

17 Apr 2023 Monday 17:50 [carter] High water alarm notifications checked and received by Carter, Leblanc, Ingram Brune and Massey.

17 Apr 2023 Monday 10:10 [carter] Quarterly check console DRD = 2,75 mR Visitor DRD = ,08 mR.

16 Mar 2023 Thursday 16:15 [Joseph Derkin] Greg and Joseph serviced the Cs sputter source on March 9th & 10th for cleaning and to replace the ionizer. There were suspicions that the ionizer may be poisoned and needing to be replaced. Source current was reading < 2uA on LE cup with a fresh proton pellet after over 8 hours of running the source. Source head was reinstalled on the 10th and began pumping down on high vacuum pump over the weekend of the 11-12th.

16 Mar 2023 Thursday 14:09 [Ingram] The sputter source is ready to be run. Talk with Greg about using it. I will be out of town on Friday. David Ingram

15 Mar 2023 Wednesday 16:46 [Ingram] Always on light in the STR is out as is the one on the west sdie of the LTR.

15 Mar 2023 Wednesday 16:42 [Ingram] Sputter source vacuum back to normal, 1.2E-6. Ionizer set to 10 A. All other controls run down, HV suppies may not be at zero.

15 Mar 2023 Wednesday 13:02 [Ingram] The sputter source is out of action until Greg has inspected and possibly replaced the cooling lines that were damaged by a small fire last night. The cause of the fire was the cooling lines on the left hand side of the source being moved too close to the source while it was running. High voltage discharge to the plastic probably ignited the plastic.

02 Mar 2023 Thursday 11:10 [carter] Checked for cause of instability of HE steerer supply #2 and found and replaced a bad/open high voltage resistor. Also removed the power supply for LE steerer #1 and checked all resistors and looked for any cause for abnormal behavior that had been seen but was not being seen now. No problems found and supply checked good. Checked for proper operation of all (HE and LE) steerer voltages and all look good now.

03 Feb 2023 Friday 18:53 [Justin Warren] Chain stretch alarm went off at approximately 17:30. Greg shut accelerator down and allowed it to cool for ~20 minutes. Upon restart, no alarm was triggered but after about ~10 minutes another chain stretch alarm was occured. Accelerator and source were shutdown and 9Be(p,n) experiment ended.

27 Jan 2023 Friday 19:36 [Joseph Derkin] Chain stretch alarm went off at 19:21 while taking data. Accelerator was immediately shut down.

27 Jan 2023 Friday 00:31 [Nisha Singh] The chain stretch alarm went off during the run aropund 11:20 pm. The alarm was ackowledged. Greg was called and the accelerator was turned off. When the chain motors were turned off the chain stretch alarm light on E1 panel cleared. Since ereything seemed normal, the accelerator was turned on again and the charging voltage was set to ~4.5 MeV. Withing 15 minutes of the accelerator on, the alarm went off again. After contacting Greg, he advised to put the charging voltage at 0.1 and turn on the accelerator to see if the alarm goes off again. Within 10-15 minutes, the chain stretch alarm went off. So the accelerator was shut down according to shut down protocols. The pulsing and buching, magnets and the steers were all turned down while the source was still left on.

27 Jan 2023 Friday 00:05 [Joseph Derkin] Chain stretch alarm went off at approximately 11:20PM, in the middle of taking data. Alarm was acknowledged on the E1 panel but the indicator light was still on. The chain motors were then turned off, and Greg was called. Greg advised to restart the accelerator, and the chain stretch alarm did not trip again. Greg said it was okay to cautiously resume data taking.

25 Jan 2023 Wednesday 21:58 [Joseph Derkin] Accelerator shutdown module shut down the accelerator at ~21:35 on Wednesday January 25. E2 alarm tripped, sub loops temp warning light was on; unitility loop light engaged in the vault. Per Greg's direction, we are leaving the control power off over night and he will investigate in the morning.

19 Jan 2023 Thursday 13:07 [Tom Massey] We had a spark when condintioning the column. We had no excursions on the LE vacuum up to 4.5 MV. When we went to 4.550 MV we had an excursion and a spark. We will wait 10 minutes and try again.

18 Jan 2023 Wednesday 13:54 [Leblanc et. al.] Tank spark today caused E1 alarm panel to light up. After reset and shutdown, E1 input 9 (chain stretch) was stuck in latched ON. Chain stretch switch was open, indicating that the fault is in the E1 panel circuitry. Moved chain stretch alarm to input 10. Will verify chain stretch switch at next tank opening. Cleared operators to resume operation.

18 Jan 2023 Wednesday 09:29 [Bikash Chauhan] Ion gauge under stairs requires a change of filament. Currently, we are using backup filament.

09 Jan 2023 Monday 15:07 [Leblanc, Carter, Gothberg] Quarterly Safety Checks completed by Leblanc, Carter, and Gothberg. Operator DRD accumulated dose: 0.24mR, 2nd DRD accumulated dose: 0.00 mR.

03 Jan 2023 Tuesday 11:09 [Ingram] Energy calibration checks have been done with elastic scattering of alphas by oxygen at 3.035 MeV, 5.139 and 5.375 MeV where there are obvious resonances. The scattering angle was 168 degrees. The energy was determined by the NMR in the usual way via the analyzing magnet. For both 3.035 and 5.375 the energy determined by the NMR setting may be up to 5 keV low. Both of these resonances are narrow enough to detect this but the energy increments used were 5 keV. Also, it likely that the energy resolution with all the slits at 0.030" is not less than 5 keV. My conclusions is that the energy calibration of the machine has not been significantly affected by the flood.

03 Jan 2023 Tuesday 10:56 [Ingram] Recent tests of the Alphatross have indicated that currently 90 V is the best voltage at which to operate the oven. The output will increase about 20% by increasing the voltage to 95V. This is much less than the increase from 85 V to 90 V. There is no benefit to operating above 100V. The oven temperature is not a reliable measure in terms of the output. It varies over a few minutes by 5-7 deg C. Is this rf noise? Work with the source over about a month has seen the LE cup output drop from 900 nA to about 250nA .This is with the insert at a depth of 0.025". This was the highest output seen as we increased the depth.

21 Dec 2022 Wednesday 10:50 [Leblanc, Carter] Oven temp readings very erratic with the RF on. We added 3 ferrites near the controller, and 2 near the oven at a safe distance from the heat. Tightened the terminal screws holding the wires in the connector at the controller. Unplugged the ground on the shield from the controller. Readings seem steady so far.

21 Dec 2022 Wednesday 09:33 [Ingram] Alphatross oven temp is reading very negative with the rf on.

08 Dec 2022 Thursday 15:07 [Joseph Derkin] E1 alarm tripped at ~ 14:45, under "Water hot or air low" message. Greg inspected main loop temp and receiver/line pressure. 2-3 minutes later E2 module tripped and E1 with "water hot or air low". Accelerator shutdown. Magnet loop warm.

25 Nov 2022 Friday 16:29 [Tom Massey] I found the alarms soudning when I was in the Lab. The AIR/WATER interlock had tripped the alarm. I reset the Shutdown alarm and the leftmost E1 alarm "Water Hot or Pressure Low". The plots of the temperature and pressure readings do not show any excursions.

23 Nov 2022 Wednesday 14:46 [Leblanc] Process chiller repair notes, various dates. We had a solenoid coil pack fail on compressor #1 (largest compressor). This caused circuit 3 not to run, and eventually caused us to blow fuses on the control transformer, which is how we eventually found the problem. With the coil replaced and the cutout switch reset, compressor #1 was found to be short cycling, even when the main controller was not calling for any cooling. Troubleshooting eventually found that one set of contacts on the control relay had welded, causing that compressor to stay on continuously. This was probably caused when the coil pack gradually failed and drew more and more current. Currently compressor #1 is disabled by removing the control relay until a replacement can be obtained. Relay PN is 55.34.8.240.0000 and they are available from Newark. Steve from Professional Refrigeration & A/C was on-site to assist with troubleshooting and repair. Additionally, the freeze protection thermostat probe wires for compressors 1 and 3 were found to have been cut, probably by a string trimmer. The units will display "EP" when the probe has failed or the wire is cut. They are currently patched with wire nuts, but running them through some liquid-tight conduit would be a safer solution, and will be done as weather and time permit.

17 Nov 2022 Thursday 10:26 [Ingram] Generator test this morning

16 Nov 2022 Wednesday 09:00 [Ingram] Tritium alarm and the soutter source low flow alarm both going off. No obvious reason. Rest the tritium. Source low flow silenced. BTW this keyboard at the control desk has no lights except the Fn key which is flashing,

07 Nov 2022 Monday 21:06 [Ingram] Alphatross testing continued. The source is being run under the conditions in the handbook except the oven voltage is 115 V. The output of the source does not seem to depend strongly on the oven voltage. I have varied the voltage from 100 V to 120 V. The oven temperature was 177 deg F after 20 minutes at 115 V. After two hours the temperature was 179 deg F but had been varying +/- 3 deg F. The temperature of the oven varies randomly with very short periods. Is this caused by RF pickup? The output of the source at the LE cup does increase slowly for about two hours after turning the source on with the oven at 115 V. This follows the slow change/increase in the temperature of the chamber. There is black plastic over the side away from the camera to reduce the air flow from the HVAC affecting the temperature of the oven. The HVAC operation does affect the output of the source as noted in the winter of 2020/21. That variation takes 20 minutes or so. Reducing the gas flow from 0.35 sccm to about 0.20 sccm does increase the source output by about a factor of two. The latest test was on November 3, 2022 with the BN insert drilled out by 0.025''. This gave close to 1 uA in the LE cup. The LE cup current has been increasing as we have increased the depth of the drilling of the BN insert. The probe current is now over 2 mA. But does not change at the same rate as current in the LE cup. The next test will be with an insert drill out to 0.030''.

07 Nov 2022 Monday 19:11 [Ingram] Foil check November 3, 2022. Using 2.2 MeV He++ with about 1uA in the LE cup the following foils are rated as good. The current in the HE cup was about 1 uA for the good foils. Other foils had zero to 0.3 uA. Foils 43, 44, 46, 47, 48, 49, 50, 51, 54, 57. Foil 43 is 2 ug/cm2, the rest are 5 ug/cm2. This is similar to what we last year at this time.

07 Nov 2022 Monday 09:44 [ Leblanc] Alarm in control room was SF6 monitor. Tank volume looked constant over 1000 points. Full month plots fluctute by a full bottle (roughly 30.5 min, 31.5 max). Full year data shows a steady drop in volume, approximately 1 bottle per year. Will do another leak check.

07 Nov 2022 Monday 09:18 [Ingram] Loud beeping noise in the control room. Probably a UPS near the SF6 pressure monitor. I have to go to class.

06 Nov 2022 Sunday 16:46 [Ingram] Source cooling water low. It will need to be filled before running tomorrow.

04 Nov 2022 Friday 14:14 [carter/massey] Swinger to tweaker ratio for deuterons ? 174.295 / 7.3744 = 23.635

27 Oct 2022 Thursday 09:50 [Ingram] Generator testing

18 Oct 2022 Tuesday 07:05 [carter] The switcher magnet power supply should now be able to provide up to 120 Amps to the switcher magnet. Experiments that require less than 120 Amps on the switcher magnet should be able to run. The stability of the 2-supply operation looks good and was tested up to 75 Amps. To avoid unnecessarily stressing the system, operation at higher currents will be done when there is an intent to use the higher currents, but no known issues exist that would prevent operation to 120 Amps. Because of the recently discovered fact that the switcher magnet measured current was was reading low (0.76) of the actual value, and we are now indicating the "actual" switcher current, the "magnet predictor" value for the switcher current needed for a particular beam and energy will need to multiplied by 1.315 to determine the estimated actual current now needed from the switcher power supply.

18 Oct 2022 Tuesday 06:49 [carter/leblanc] A second 60 Amp power supply was added as a "slave" to the original 60 Amp supply we are using for the switcher magnet power supply. The control of the magnets is still done using the "switcher 60" control window. This computer window will display 1/2 the actual magnet current when the second power supply is enabled. This was done to preserve the more precise "setability" (minimal stepsize) of the switcher 60 control window but since there are 2 supplies in parallel, the actual current is twice the setpoint current. The analog panel meter and the logging systems will display and record the "actual" magnet current. The power supply console panel indicates these changes with new labeling.

14 Oct 2022 Friday 09:55 [Joseph Derkin] Quarterly check: user DRD accumulated dose is 0.0 mR/h, operator DRD accumulated dose is 0.13 mR/h