Time: 2022 Jun 29 8:08:43
Found 2715 logbook entries, displaying most recent 100
Logbook Contents (Most Recent Entries)
22 Jun 2022 Wednesday 13:06 [Tom Massey] The saved settings for pulsing and bunching have been tabulated on a spreadsheet Pulsing_bunching on the desktop of the "Contol" computer.
13 Jun 2022 Monday 16:06 [Tom Massey] The temperature controller on the sputter source was disconnnected from the power and then plugged back in. This reset got rid of the error warning. The temperature controler now works fine.
13 Jun 2022 Monday 09:01 [Tom Massey] I started the sputter source at ~6 PM yesterday. I had ~ 1 microamper when I left. There was a problem with the temperature controller. It now gives and Err 1 on the display. The temperature of the source is 80 degrees and the current 0.184. I have set the source for changing of the target settings: ionizer 10 amp, with the Dell, Target and Extractor off.
27 May 2022 Friday 15:46 [Ingram] The fire alarm went into trouble this morning. I called it in. The issue was the phone line. The cable was being replaced today. Eventually (1~hr later) a technician showed up to reconnect the system. The cable was on back order so the work did not take place last week, as I had been told it would. The system is now normal.
16 May 2022 Monday 08:55 [Zach Meisel] Source cooling water low alarm. Acknowledged at 8:55am.
09 May 2022 Monday 10:51 [carter] Computer and electronics restarted after shutting down for planned 12 hour power outage Saturday night.
09 May 2022 Monday 10:50 [carter] Sputter source low water alarm thresholds re-adjusted to alarm properly when the source cooling water is low.
05 May 2022 Thursday 20:54 [Nisha Singh] The alarm for SPUTTER SORCE LOW FLOW went off, while I was doing an energy change. I called Greg and we noticed that the source had shut down. He suggested to turn the control power on but it automatically turned off and the alarm went off again. We saw that the water level in the source tube was very low. I filled the tube to full and tried to turn on the source twice again but it automatically kept turning off. This time however, the alarm did not go off. Greg said that he will have to check tomorrow why the water cooling is not working. I have shut down the accelerator completely leaving the chopper and buncher on. All the magnet values are saved and turned off.
18 Apr 2022 Monday 10:56 [carter / LeBlanc] Alphatross control computer imaged to new 2 Tb SSD drive and software updates applied. Original drive retired and now running on the new SSD.
14 Apr 2022 Thursday 11:10 [carter / LeBlanc] Alphatross control computer imaged to new 2 Tb SSD drive and software updates applied. Original drive retired and now running on the new SSD.
28 Mar 2022 Monday 11:13 [Leblanc] Reinstalled RF box cover and installed chamber thermal probe. Temperature measurements seem stable now.
28 Mar 2022 Monday 11:06 [Leblanc] Alphatross rebuild complete. Pumped down to 2e-7 over the weekend, although slow to pump initially on Friday. Mineral oil replaced with LOBS for lower viscosity. Steady-state temperature running "water" control 28.8 degrees C (33 degrees C with mineral oil). Plasma was slightly hard to start this morning, but started with additional gas flow and probe voltage. Probe current is very low (0.6 mA). Temperature controllers are also reading incorrect values (-175 +/- 25). Will continue to monitor. Hour monitor was at 18453.7 at source power on.
22 Mar 2022 Tuesday 16:45 [carter] A new Swan camera has been installed for the sputter source, same model that is on the alphatross. The joustick will control the camera position, accessed as "3 cam". The old pre-defined positions have been defined same as the console tag said for the old camera.TEMPS = 1 call, ION/FEED = 2 call, RES I = 3 call, TARGET/EXT = 4 call and GLASSMANS = 5 call. The old position control now is only connected to the swinger camera.
21 Mar 2022 Monday 09:45 [Leblanc] Alphatross source failed with a probe short on Friday, after about a week of running. On inspection, the canal and insulator were covered in Rubidium, and the O-ring was very securely stuck to the end of the bottle. The canal holder was stuck in the mounting flange. Turned on the fluid heater and applied a heat gun, but was unable to get it loose. Cleared the hole with a piece of wire and reassembled with a new o-ring, canal, and insulator. Vacuum was in the 10^-6 range immediately, indicating no significant vacuum leaks. During replacement, the RF leads were not removed from the inductor or the bottle. Heater removed from the electrical circuit, to evaluate maximum fluid temperature without added heat, and without NEC supplied cooling. We added heat because we had freeze-out of Rb on the canal holder, and we thought adding heat to the baffle would help keep the Rb liquid. Perhaps the problem is the opposite, and we need to remove even more heat from the liquid cooled baffle in order to keep the inlet end of the oven cold enough to condense the Rb vapor without allowing it through the inlet hole. See cross section at: https://inpp.ohio.edu/~wiki/handbook/lib/exe/fetch.php?media=ja005110.pdf
11 Mar 2022 Friday 11:55 [carter/LeBlanc] CPU and rear case faans replaced in OUALDAQ machine.
10 Mar 2022 Thursday 05:41 [carter] The control room data logging and accelerator control computer (control1) system disc has been backed up to a new SSD drive and the old IDE drive has been retired to an emergency backup drive and has been left inside the computer.
28 Feb 2022 Monday 11:45 [carter] The tandem computer was imaged to a new 500 GB SSD drive and the old SSD drive has been retired as a backup.
28 Feb 2022 Monday 11:43 [carter] The alphatross control computer was imaged to a new drive and the old drive retired as a backup. After installing the new drive all of the pending centos7 updates were applied. If you observe any unusual behavior with the updated alphatross system, please contact me.
24 Feb 2022 Thursday 15:03 [carter] The new SSD drive on OUALDAQ for /data2 has been installed and the older drive retired as a backup.
21 Feb 2022 Monday 15:23 [Carter, Massey and LeBlanc] Large target room radiation monitor detector checked for calibration and functionality. Checked at 10, 20 and 40 mR and instantaneous shutdown at 100 mR. All functioning properly after detector repair.
21 Feb 2022 Monday 15:20 [carter] Radiation monitor detector for large target room repaired. The connector at the detector was found underwarter and probably arcing to the HV of the ionization detector in the connector. Meter indicating full scale. Connector cleaned and both the electrometer amplifier and the buffer amplifier were replaced. Now functioning properly again. Calibration of the detector will be done.
18 Feb 2022 Friday 12:21 [Leblanc] Magnet primary loop reassembled. Main loop valve is still broken. Disassembled while the water was off, and found the last 1/2" of threads missing from the gate drive screw. Could not see any threads on the gate at all. Chopped the screw shorter and reassembled. Reassembled bypass loop using a hose clamp and an exhaust (U-bolt) clamp to try to prevent another water explosion.
18 Feb 2022 Friday 09:01 [carter] The control room data logging and accelerator control computer (control1) system disc has been backed up to a new SSD drive and the old IDE drive has been retired to an emergency backup drive and has been left inside the computer.
18 Feb 2022 Friday 08:56 [carter] oualdaq, the 8ADC control room data acquisition computer, has been backed up to new SSD disc drive. The new SSD drive is the current system disc and the old IDE drive was retired and left inside the computer as an emergency backup disc. Also, the other drive on that computer, /data2, was backed up to a new SSD drive.
17 Feb 2022 Thursday 16:57 [carter] There was a cooling water leak at the lab this afternoon and one of the connectors for the radiation monitor was soaked by water causing the detector for the large target room to indicate full scale causing a machine shutdown and alarm. The radiation monitor has been turned off to allow the connector to thoroughly dry out. I am on leave tomorrow so I will try to turn it back on Monday, just be aware that the radiation monitor is off-line until then.
16 Feb 2022 Wednesday 04:55 [carter] OUALSS3 (L-15 goni15 implant system) system disc has been imaged to a new 500Gb SSD drive. The currently functional previous drive was retired as emergency backup as of 15 Feb 2022 and was left inside the computer. It seems that the only way to attach the new SSD drive to create the image copy was to select "cable select" on the IDE2SATA adapter, connect the drive to the "secondary" disc channel using the gray connector (first after connector to motherboard). The new drive was recognized as /dev/hdd and /dev/hda was imaged to /dev/hdd (dd if=/dev/hda of=/dev/hdd). The image copy took about 30 hours.
16 Feb 2022 Wednesday 04:37 [carter] Accelerator Lab "Realtime Status" web pages are offline for system disc image backup. Should be back online Wednesday around noon.
13 Feb 2022 Sunday 12:48 [Thomas Massey] Water Hot or Air Low alarm was sounding. The subloop warning light is on. I have silenced the alarm at 12:50 PM.
08 Feb 2022 Tuesday 10:46 [Ingram] It is the utility sub loop temperature that appears to be setting off the sub loops temperature alarm, and not the magnet loop. I have turned the magnet power supplies back on. Greg is working on the utility loop.
08 Feb 2022 Tuesday 08:24 [Ingram] Air/Water alarm going off. Magnet sub loop temp too high. Magnets turned off.
03 Feb 2022 Thursday 14:18 [leblanc] Water still plugged back in and miraculously working again, after sitting idle for a few weeks. Magnet loop primary pump shaft seal failed yesterday. Replaced, but the shaft OD is reduced, so a new seal won't fix the problem. Need replacement shaft, will swap with brand new spare pump next week (pump part number changed old: 1522 new: e-1535). Gate valves on the magnet loop are also sticking, unable to be opened, and leaking when closed. Ball valve on make-up water for magnet primary loop is stuck in the closed position. Utility loop disassembled to repair leaks in copper lines. Repairs in progress.
03 Feb 2022 Thursday 09:30 [Ingram] Source water alarm going off. Source water topped up with two gallons of DI water but it needs more. There is no more distilled water and the still is unplugged, why?
12 Jan 2022 Wednesday 15:00 [carter] Quarterly check console drd accum was 2.25.mR.
03 Jan 2022 Monday 15:29 [Leblanc, Gothberg] Magnet secondary loop was low on water (pump was cavitating occasionally) After some plumbing modifications, we added six (6) gallons of distilled or de-ionized water. This was not enough to cure the cavitation, so enough city water was added to give < 5 PSI at the pump inlet. Filter cartridge on the inlet to the demineralizer was replaced (normally white colored wound bobbin was black), and the housing was cleaned. The pump outlet pressure gauge is cloudy and needs to be replaced.
29 Dec 2021 Wednesday 11:49 [carter] Broken charging voltage 10-turn dial replaced on charging controller.
28 Dec 2021 Tuesday 12:35 [Ingram] I think there is some cavitation audible in the magnet loop water pump.
27 Dec 2021 Monday 11:41 [Tom Massey] I found the souce water low alarm sounding. I added a gallon of distilled deionized water an the loop was full.
17 Dec 2021 Friday 16:01 [ggg] ggg
15 Dec 2021 Wednesday 13:07 [Leblanc, Carter, Gothberg] Alphatross He4 mass flow controller failed on December 14th, while trying to set up for a run for Joseph. Symptoms that the source would repeatedly turn on and off. Eventually the plasma would ignite as well, making the power cycling even more apparent. Eventually Don and I found that the Vacuum OK relay was opening, causing the system to power off, which turned off the He flow, which allowed the vacuum to recover, turning on the helium and repeating the process. Kate and I moved the MFC from He3 to He4, and replaced the He3 with a piece of straight tubing. Ran a brief test to insure operation, and then left the system to pump down. Alicat Scientific model number MC-2SCCM-D/10M Serial Number 176829 Calibrated 5/15/2018. Supposedly lifetime warranty, so I will contact support.
14 Dec 2021 Tuesday 12:06 [carter/leblanc] Additional diagnostics done on the buncher and its HV power supply. Found that removing a filter capacitor that was previously added to the screen supply voltage removed the small (~10% p-p ripple) observed at the RF output of the buncher. A larger filter had been added to the HV (2.5KV) supply and was doing a very good job of removing ripple on that supply. HV supply ripple was very small. The RF and HV supply looks very clean now with respect to 60 Hz ripple. Much better than before. The buncher tubes were also checked and found to be working fine.
13 Dec 2021 Monday 11:44 [carter/leblanc] Additional diagnostics done on the buncher and its HV power supply. Found that removing a filter capacitor that was previously added to the screen supply voltage removed the small (~10% p-p ripple) observed at the RF output of the buncher. A larger filter had been added to the HV (2.5KV) supply and was doing a very good job of removing ripple on that supply. HV supply ripple was very small. The RF and HV supply looks very clean now with respect to 60 Hz ripple. Much better than before. The buncher tubes were also checked and found to be working fine.
09 Dec 2021 Thursday 15:44 [carter/leblanc] Sola constant voltage transformer installed to provide regulated line voltage input to the buncher plate power supply. This will minimize plate voltage changes as a function of building line voltage fluctuations.
08 Dec 2021 Wednesday 15:00 [carter/leblanc] Checked calibration of slit control amplifiers and checked offset between HE and LE slit amplifiers. Gain of the two meters has been calibrated at 100 nA. It should be noted that the HE slit current meter was previously replaced and the replacement meter has a mechanical stop at zero and the meter will not deflect negative. I believe this was a factory modification as the original HE meter would stick at the far negative deflection and not read current, so the factory (or NEC) made a modification to prevent this. The meter in the LE side is an original and it will deflect slightly negative. This causes the two meters to indicate differently at currents less than 10**-9 so that condition should be ignored. As the meters deflect in a positive direction they read correctly and are calibrated at 100 nA. The spare meter we have in the repair parts inventory is the original HE meter with an in-house modification to mechanically stop at zero and should be a good replacement meter.
06 Dec 2021 Monday 09:35 [Leblanc] Added 1 gallon of water to sputter source cooling loop. Still unsure of where the leak might be.
06 Dec 2021 Monday 08:45 [Ingram] Source cooling water alarm is going off, I have silenced it. Workers are here replacing the regulator in the mechanical room upstairs.
16 Nov 2021 Tuesday 12:15 [Leblanc] Alphatross plasma color is off, probe current is high, and pressure is unresponsive to changes in He flow. After running the source for half an hour, plasma extinguished. Going to try replacing the canal and insulator before doing a full rebuild.
09 Nov 2021 Tuesday 10:54 [carter] Modified the SF6 tank volume fixed scale from 32 - 36 bottles to 30 - 38 bottles keeping the midpoint at 34 bottles as it was before.
02 Nov 2021 Tuesday 16:48 [Ingram] Foil check with 2.2 MeV 4He. Good foils found: 43, 44, 46, 47, 48, 49, 50, 51, 54, 57, 58.
28 Oct 2021 Thursday 14:45 [carter/leblanc] Stripper foil "reverse one" switch was found defective and replaced. During the repair, the foil counter was not on and the foil mechanism was run down approximately 10 positions making the foil counter incorrect. The new foil #1 position was determined using the space where no foil hangers were detected by the moving foil position and we believe we have accurately determined foil position 0 and the counter has been reset to indicate the same foil position as before.
27 Oct 2021 Wednesday 09:17 [Ingram] Alphatross shutdown not working. The keyboard will not respond to y. Caps lock is off.
18 Oct 2021 Monday 16:11 [Leblanc] Testing stripper foils using Alphas at 2.2 MeV. LE current approx 600 nA. HE currents as follows: Foil 56 approx 100nA. Foil 57 approx 420nA. Foil 58 approx 40nA. Foil 59 approx 50nA. Foil 60 approx 420nA. Foil 61 approx 380nA. Foil 62 approx 50nA. Foil 63 approx 55nA. Foil 64 aprox 55nA. Foil 65 approx 60nA. Foil 66 aprox 70nA. Foil 77 approx 550nA. Careful tuning may produce better results. Left stripper on position 57.
18 Oct 2021 Monday 15:14 [carter] The phase A,B,C logged voltages are derived from the main power disconnect of the analyzing magnet. When this breaker is off, phase voltages A,B and C are recorded as zero.
14 Oct 2021 Thursday 11:28 [Leblanc] LE Extension ion gauge failed. Will requre venting to atmosphere, regenerating cryopump, roughing and restarting high vacuum pumping. Machine will not be operational again today.
12 Oct 2021 Tuesday 20:53 [leblanc] Added 3 liters of water to the sputter source loop, and the alarm cleared. Perhaps the leak is not yet fixed.
12 Oct 2021 Tuesday 08:43 [Ingram] Source cooling water low alarm going off, acknowledged but still red. No obvious reason for the alarm. Water level looks okay. Will wait for Greg.
11 Oct 2021 Monday 13:40 [Leblanc, Carter, Massey] Quarterly Safety Checks DRD: 3.46 mRem
08 Oct 2021 Friday 17:03 [Ingram] 15L beamline pump not working. HV valve closed. Diff pump and baffle turned off. Backing pressure >200mTorr according to guage.
17 Sep 2021 Friday 08:27 [Tom Massey] The low water alarm for the source has sounded. I am shutting down the source to check the problem.
16 Sep 2021 Thursday 09:45 [Tom Massey] The loss of beam and the poor pulsing and bunching seen was due to a change in the source. The inflection magnet value and changed slighly causing a factor of 2 loss in beam. This was retuned to give back 13 microamps DC in the LE cup. The run was able to continue after retunin and redoing pulsing and bunching.
15 Sep 2021 Wednesday 07:56 [Justin Warren] At approximately 5:30 AM 09/15/21, beam current for the LLLNL experiment went from ~85 nA -> 30 nA and became unstable. Data collection stopped at 5:50 AM. Current remained unstable until accelerator shutdown. At ~5:20, sputter target current 5 mA -> 8 mA, then 8 mA -> 4 mA around 5:30.
30 Aug 2021 Monday 13:21 [Leblanc] Added 1 gallon of water to the sputter source cooling loop this morning. Need to try to find the tiny leak.
29 Aug 2021 Sunday 20:28 [alarm: source cool water low] Got to lab around 8 pm to fill HPGe detectors and "source cooling water low" alarm on E1 panel was going off. Hit awk and the alarm did not repeat. Book says to contact staff for adding water to the loop. -KB
26 Aug 2021 Thursday 12:11 [Tom Massey] Analyzing Magnet is having control problems. The current jumps slightly ~31.02 to 31.04 in NMR. This has been seen recently and should go away as the regulation electronics warm up. We have recycled tha magnet after the last jump in current. We are still seeing the current jumps. We will wait for this system to warm up.
26 Aug 2021 Thursday 07:28 [Gula Hamad] This morning when I came in the source water cooling alarm was on. I silenced the audible alarm and sent a message to Greg about the alarm. Thanks
19 Aug 2021 Thursday 10:35 [Tom Massey] We have 30 mR in the Source Radiation Monitor. This is with 7 MeV deuterons and a Be target. This 2.5 MeV deuterons can make neutrons and gammas. This may not be a problem with the LE tube .
18 Aug 2021 Wednesday 09:02 [Leblanc] Refreshed Cesium after outage last week. Beam came back to > 20uA at LE. New looser tent seems to work well, reduced temperature to 130 C and maintained good beam.
17 Aug 2021 Tuesday 15:04 [Carter] Checked over the buncher 2.5KV 150mA power supply. Removed the 4uF 3KV filter capacitor and replaced it with an 8uF 2KV unit in an attempt to reduce any ripple on the buncher plate supply hoping to reduce pulsed beam tails. Placed a reminder label not to operate the plate voltage above 2KV, which we never need in our normal operation. Replaced the HV feed-thru bushing that looked like it had been possibly leaking to ground. Also replaced the 4" fan that was cooling the bottom chopper electronics and that seemed to cure the double pulsing problem of the chopper.
14 Aug 2021 Saturday 11:11 [Tom Massey] The target current has dropped overnight following the vacuum problem in the sputter source. A new pellet was put in after the problem and had 1.5 microamps initiall. The LE current dropped overnight as the target current. We have shutdown the source for maintance.
13 Aug 2021 Friday 13:41 [Tom Massey] The control power for the cesium sputter source turned off. There was a small rise in vacuum in the LE extension just before this. The vacuum was bad at the source box and the ion gauges did not stay on. The gate valve for the between the source box an the diffusion pump closed. The vacuum system was restarted the diffusion pump warmed up and good vacuum was achieved shortly
12 Aug 2021 Thursday 11:04 [Tom Massey] The radiation detector at the low energy end of the tandem is reading 20 mR/hr. This is associated with beam in the tandem. The reading is much lower with the LE cup in. We are running 7.0 MeV deuterons on Be with the Vault radiation monitor off scale.
11 Aug 2021 Wednesday 21:00 [Joseph Derkin] Ludlum dosimeter warning alarm went off at 8:45pm. Accumulated dose reads 0.19 mR/h. Suspected low battery.
10 Aug 2021 Tuesday 10:06 [Leblanc] Removed D- pellet, found pellet completely depleted. Installed H- pellet from last week. Good beam current within 1hr, indicating no problems with source. Installed new D- pellet, waiting for beam.
10 Aug 2021 Tuesday 08:38 [Leblanc] Came in to find beam current had dropped from 10 uA at 5PM to 4uA at 8AM. Target current around 8mA, with peaks of 20mA overnight, though no logged sags in target voltage. Given that this pellet was new just 92 hours ago, I suspect that the source needs to be cleaned.
05 Aug 2021 Thursday 17:23 [Leblanc] Alphatross source ran M,T,W this week, giving > 1uA of current at the LE cup. Plasma bottle inspected on Thursday AM, looked clean. Button inspected with barely a trace of Rb on the surface. Reassembled and pumped down. Ion gauge relay output to control computer not working properly, not sure of the cause, but has no effect on operations.
30 Jul 2021 Friday 16:07 [Leblanc, Carter] Alphatross source operating. Found some instability in the bias voltage/current. Instability was minimal below 16.5kV. Tuned system and achieved approximately 400 nA of DC beam at the LE cup without excessive beam instability. Oven voltage was only at 80V, leading to a chamber temp of 55 and an oven temp of 176.
30 Jul 2021 Friday 12:43 [Leblanc] Alphatross rebuilt. All parts cleaned through cooling flanges. Fresh Rb loaded. Reused canal and insulator. Hour meter at 17777.3
26 Jul 2021 Monday 16:59 [Leblanc, Carter] Inspected Cs Sputter source today. Found a baffle installed what looks to be backwards, based on a newly discovered drawing. Reassembled correctly, with all screws tight. System is under vacuum and will be started tomorrow.
26 Jul 2021 Monday 16:57 [Leblanc] Alphatross heating loop blew a hose on Friday. Left oil dry out to soak up the mess over the weekend. Further work is on-hold until parts arrive.
21 Jul 2021 Wednesday 12:06 [Leblanc] Shutdown and inspected alphatross source. Found Rb contamination throughout the plasma bottle. Cleaned and reassembled source. Reduced LOBS loop temperature from 40 to 35 centigrade.
21 Jul 2021 Wednesday 09:05 [Leblanc, Carter] Alphatross probe short Monday afternoon. Source turned off on Monday. Tuesday, source backfilled and bottle removed. Found dark grey deposits on the inside of the plasma bottle, which disappeared on exposure to air. Bottle cleaned, canal and BN insulator replaced, vacuum restored. Current unstable at first, but eventually nearly 1uA in the LE cup, fairly stable. Left source running overnight. Wednesday morning, no beam current. Found probe had developed a short starting around 4 AM. Short was intermittent until around 7, at which point it became steady and pulled the probe voltage down to around 1kV.
08 Jul 2021 Thursday 10:28 [Tom Massey] 7/8/2021 Operator DRD reset 0.42 mr reading.
21 Jun 2021 Monday 23:47 [Yenuel Jones-Alberty] Target current sharply increased at around 10:30 pm tonight, and then plummeted to zero. Control milliampere light on Target Glasmann was then observed to be on. We swapped the deuterium pellet for a fresh pellet, and are currently turning the source back on. The old pellet appears to still have some titanium deuteride.
17 Jun 2021 Thursday 10:12 [Tom Massey] Survey for 9Be(d,n) reaction on swinger 30 nA beam. No detectable neutrons or gamma at Small Target Room Door. Larget targe Room 25 cts neutrons at 15 R beam leg opening no gamma detected. Garage area 25 cts thermal and 50 cts fast neutrons at door wheel wells, no gamma.
14 Jun 2021 Monday 09:56 [Leblanc] Duterium pellet removed from source. Pellet appeared depleted. New pellet installed. Turning on HV supplies causes target PSU to go into current limiting mode. Need to service the source.
11 Jun 2021 Friday 18:20 [Tom Massey] The target high voltage shorted out and is now in current control mode. I turned the target voltage down and this did not change the current reading. I shut the source down and the target current dropped when the ionizer was turned down. The short came back when the target current was turned on and stayed on. The source has been shut down.
10 Jun 2021 Thursday 16:06 [Carter/LeBlanc] The new AMI Oxygen Deficiency monitors are installed and calibrated, one on the dock and one in the pit. The the display value for normal oxygen level will read 20.9% locally on these monitors. A green LED on the front of the unit indicates normal safe condition. If the level drops to 20.0% the status LED will change from green to yellow. Then, if the level drops to below 19.5%, the status LED will turn red and a 95dB local alarm will sound. Pressing "Silence" will silence the alarm for one minute. Leave the area immediately and call for help. If the status LED is flashing red, AC power has been lost and the unit will continue to operate for about one hour. The oxygen sensor data is logged and a plot available on the real-time data plots under the "Miscellaneous" section labeled "Pit_O2" and "Dock_O2".
04 Jun 2021 Friday 16:34 [Leblanc] Alphatross source cleaned and rubidium charge replaced. Pumped to high vacuum until about 2PM today, then started source. Obtained approximately 5uA of current at the source cup, but only 9nA at the LE cup. Turned Rb oven off, letting plasma run over the weekend.
04 Jun 2021 Friday 16:21 [Carter/LeBlanc] Remote logging of the vault pit O2 monitor connected and functioning. O2 levels and alarm status can be viewed in the control room for the vault pit O2 monitor.
04 Jun 2021 Friday 11:59 [Carter/LeBlanc] New AMI Model 221R O2 oxygen deficiency monitors installed and functional in local mode. Remote mode communications and software has been tested but wires will need to be run for remote monitoring connections to the control room computer. One unit is in the accelerator pit and one on the accelerator dock area and have local readouts and alarms for the respective areas.
01 Jun 2021 Tuesday 17:56 [Greg] Trouble with the alphatross source today. Plasma color looks purple/pink on the monitor, and beam current is very low. Probe current appears within normal range. Current PV 6kV, PC 3mA, EV 5.5kV, Oven at 80V, Bias at 49kV. Chamber temp is 49 Celsius, oven temp 172 Celsius, 0.2 SCCM He4. Resulting negative beam current of 6.5nA. Disconnected probe leads and used megger to test for current through the plasma bottle, no current, no plasma induced. Back filled source with argon and checked for and found Ar flow through the He inlet. Roughed and pumped source down, plasma color still off, current still low. Turning off source, leaving "water" on overnight to try to keep the chamber warm for the morning. Need to determine next steps.
17 May 2021 Monday 17:25 [Greg, Tom, Nisha] Spent time today checking telescope alignment at swinger. Carefully set height using movable device, and checked alignment on fixed telescope. Made SMALL adjustment to level and yaw on fixed telescope. Alignment is complete the best of our ability given current tooling. Inscribed marks on the back of the tunnel appear to be correct.
15 May 2021 Saturday 18:21 [Tom Massey] I spilled some water near the oxygen sensor in the Garage area. The system gave an alert several minutes afterwards. It shows as trouble on the pannel.
13 May 2021 Thursday 11:09 [Carter/LeBlanc] Problem with analyzing magnet polarity reversal was diagnosed and repaired. Mechanical obstruction from drooping high current magnet wire was interfering with the contact mechanism. Obstructing wire moved and secured away from the contact.
06 May 2021 Thursday 11:09 [Greg, Yenuel] Came in this morning and inspected the pellet. Looked "icky", see https://photos.app.goo.gl/tWauxzzaVLHh5csv5 Made new pellet, loaded into sputter source. Short seems to have cleared, new pellet is warming up now.
05 May 2021 Wednesday 20:55 [Justin Warren] Update Dropping the cesium resivoir current did not reduce the target current after ~30 minutes and beam was not regained on the low energy cup. Proceeded to shut down the sputter source and accelerator. During the shutdown of the sputter source, while dropping the ionizer current, the target current dropped to 0 mA.
05 May 2021 Wednesday 20:06 [Justin Warren] At approximately 7:30 PM on 05/5/21, the target current on the sputter source reached ~21 mA, and the target voltage went to current control mode. The target voltage and resivoir current were reduced to 0 to attempt to fix the issue. Further update in 30 minutes.
05 May 2021 Wednesday 09:31 [csrter] Just documenting that the sputter source oven heater is 115 VAC 200W with a cold resistance of 75 ohms.
05 May 2021 Wednesday 08:36 [Tom Massey] Debugging the sputter source. The cesium resivoir heater was checked. It checked good but was replaced. The resistances on the sputter source acceleration tube were checked. The proton pellet was replaced with an old deuterium pellet. This pellet gave 6 microamps in two hours. A new proton pellet was made. This pellet was placed in the bell jar and the pressure reduced to roughing vacuum. The bell jar was backfilled with dry nitrogen. This pellet gave 2 microampers of beam in under a half hour. The temperature on the cesium oven was raised from 117 to 120 degrees. This gave a factor of ~4 increase in beam current on target.
04 May 2021 Tuesday 09:29 [Greg] Low current from sputter source yesterday. After some testing, we decided to check cesium level, found reservoir empty. Refilled with 1g of Cesium, restarted source to run overnight. Beam current still low this morning, still trying to troubleshoot.
29 Apr 2021 Thursday 11:02 [carter] I have replaced the suspect component causing instabilities in the voltage display of the sputter source extractor supply. Testing did not reveal the previous symptoms of instability. As of this time you can believe the voltage reading unless symptoms re-appear. If you see instabilities we previously saw, let me know and go back to the voltage set dial for setting the supply. As a rough approximation, 16 KV per dial revolution of the voltage set.