Time: 2018 Aug 17 3:27:33
Found 2271 logbook entries, displaying most recent 100
Logbook Contents (Most Recent Entries)
14 Aug 2018 Tuesday 16:11 [Devon] The charging system trouble that developed last week is not in the metering system. The metering has been tested extensively and is working fine. The problem, whatever it is, lies inside the tank. These symptoms are not like anything we have seen before. Gas out Thursday. The status of the run next week depends on what we find on tank entry Friday.
09 Aug 2018 Thursday 12:07 [Devon] After the accelerator was re-started this morning we noticed multiple indications that chain 3 was not charging. This condition developed yesterday evening. Upon further analysis other indications show that chain 3 is in fact still connected and charging properly. We are working on the assumption that something has failed in the chain 3 current metering circuit. We will continue to run. For the remainder of the run we need to monitor various parameters to ensure nothing gets worse. The blue line (upcharge-downcharge) on the "crontab" display on control2 computer should be roughly the same value as the upcharge on chain 1 or 2 on the TPS. The downcharges (red, green, and black lines on "crontab") should be smooth and constant lines at any given terminal voltage. We will review the value of the "crontab" display at the next TALC meeting.
08 Aug 2018 Wednesday 21:39 [T. Massey] The logging for the sputter source is no longer working. The values for the parameters are all zero on the plots both on the web and local versions.
26 Jul 2018 Thursday 15:08 [Brit Kenady ] Finished Operator 2 training.
25 Jul 2018 Wednesday 15:22 [DCI] Regulated air line pressure rasied to 94 psi in mechanical room, 85 psi on panel over control panel. The analyzer and HE cups are now moving out completely. The analyzer cup is moving a lot faster too.
24 Jul 2018 Tuesday 10:55 [carter] Replaced defective f/n selecor switch in chopper/buncher drive and phasing panel. Functioning properly again.
23 Jul 2018 Monday 09:26 [Thomas N. Massey] Quarterly tests were completed on July 17, 2018 by Devon Jacobs, Don Carter and Thomas Massey.
17 Jul 2018 Tuesday 16:51 [Tom Massey] We had a 80% warning today . This is believed to be due to the Small Target Room door not being closed enough to trip the interlock. No exposure was given. Everyone was in the Control Room when it happened. The Radiation System was reset to remove the accumulated dose and prevent an unneeded shutdown. The accelerator tubes were conditioned up to 4.43 MV. Beam was run at 4.326 MV. Over 10 microamperes at LE cup, 4 microampere on the HE cup and 1 microampere on target. More current was available but the OSU students wanted to keep the measurements stable.
12 Jul 2018 Thursday 10:52 [carter] Previous maintenance on the NMR (12 Jan 2018) required that the calibration values needed to be modified to provide proper operation of the nmrgoto command. Today it was found that tne nmrgoto command was overshooting the value where previously it had been undershooting the requested value. The original calibration values were restored in the nmrgoto.daq file and the operation is now quite good. Not sure of the cause, slipping belt that is now not slipping? Anyway, nmrgoto now is quite close.
10 Jul 2018 Tuesday 17:20 [DCI] 5:00 PM Accidental radiation shutdown. Tom said the vault gate must of boounced and not latched. He removed the LE cup and the shutdown occured. No one was exposed.
29 Jun 2018 Friday 19:16 [Devon] The swinger turbo ion gauge controller failed sometime during the runs friday. It won't light up either filament. I shut down the turbo pump so there won't be any confusion about vacuum status.
27 Jun 2018 Wednesday 13:06 [Devon] Power came back around 05:30. All systems back in operation and the run has resumed as of 13:00
27 Jun 2018 Wednesday 03:27 [Justin] Power failure at EAL is still ongoing at this time.
27 Jun 2018 Wednesday 02:03 [Justin] Power failure to EAL at approximately 01:42. As of 01:52, the power outage persists and the door to the small target room is closed with no ability to access the equipment in the vault area. Returned charging voltage, terminal voltage, and gain to default settings.
26 Jun 2018 Tuesday 14:34 [carter] Test of new all operators email list
26 Jun 2018 Tuesday 13:40 [devon] test
26 Jun 2018 Tuesday 09:40 [carter] Repair 400 Volt chopper power supply (shorted rectifier, also replaced 47 uF 450 V electrolytic capitors)
26 Jun 2018 Tuesday 09:38 [carter] 2Y LE steerer was unstable. Removed the rack panel of 2Y, 1Y and 2X steerer supplies. Found all (6) 7239 vacuum tubes weak and replaced. Replaced open 2 Meg HV resistor in the original 2X supply. Also replaced 50 uF 50 V electrolytic capacitors in each supply. All 3 supplies now repaired and seem stable again.
19 Jun 2018 Tuesday 09:55 [Zach] Greetings Operators, As discussed at last week's TALC meeting, we will have visitors from LLNL next week (June 25- July 1) who will need operators to assist them and will pay for this assistance. Please express your interest to participate in various shifts during the experiment using the following Doodle poll: https://doodle.com/poll/d7n22ssrfai9vtpb. Ultimately two shifters (one operator 2 trained and one warm body) will be required for the 0-8 and 4-Midnight shifts. Only one operator 2 trained individual will be required for the 8-4pm shift (except on the weekend, where 2 will be necessary). Prompt replies would be appreciated so that we can get the schedule set well ahead of time. -Zach
12 Jun 2018 Tuesday 15:35 [carter] LE 2X steerer supply was found not functioning properly. There was an identical supply that was originally used for the 1Y steerer (removed to install the LE BPM) and this supply has been connected to control the 2X steerer. The supplies are relabelled accordingly.
31 May 2018 Thursday 08:05 [Devon] Sputter source cesium reservoir bone dry. Cs replenished. Source on.
18 May 2018 Friday 12:04 [Devon] Training for swinger endorsement and familiarization attended by: Brune, Meisel, Massey, Carter, Jacobs, Voinov, Doug Soltesz, Shiv Subedi, Tyler Danley, Rekam Giri, Kristyn Brandenburg, Som Paneru, and Justin Warren.
17 May 2018 Thursday 10:23 [carter] Test of logbook
04 May 2018 Friday 11:46 [Devon] Beam testing: A problem was observed in the 15L RBS chamber. The beam current and vanishing points were asymmetric about the optical centerline as the beam was steered left or right with the switching magnet (current max was not in the center, beam vanished at different distances from the center). This behavior indicated that the beam was not traveling down the 15L line on axis. We considered that the was some obstruction between the switcher and the collimators near the chamber, perhaps a failure of the fixed collimator on the exit port of the switcher. As a check and confirmation we ran the beam down the 30L line expecting to see symmetric behavior about the optical center, but instead, found the same asymmetric behavior, beam not traveling down the line on axis. The hunt then moved further upstream with the assumption that beam was leaving the switcher off-axis because it was entering the switcher off-axis. We monitored current on the collimator that protects the BPO on the analyzer leg - this is normally never looked at. Found that beam was striking the collimator in the current state of tuning, off center in the x-axis. With slight adjustments of Q1 and steering we found that the current on the BPO collimator could be eliminated (all beam thru the hole). With minimizing current on the BPO collimator the behavior of the beam in the 30L line became symmetric. Beam was switched back to 15L and symmetric behavior was again observed. Keeping current off the collimator proved to be a valuable tuning aide. The plan is to permanently monitor the BPO collimator current as a tuning aide going forward once a suitable meter is decided on.
03 May 2018 Thursday 18:10 [carter] Repaired sputter source 24VDC power supply used in HV interlock circuit (station W). Source HV interlock system seems to be working again.
24 Apr 2018 Tuesday 11:17 [carter] Our network firewall software has been upgraded to the current version and installed on a new hard drive. If you notice any issues with the new system, let me know.
12 Apr 2018 Thursday 16:55 [carter] The beam current meter on the console position 5 has been connected to the EG&G CD1010 current integrator thru a 1 meg ohm resistor. Full scale on the CD1010 will give 1 uA on the console meter position 5. Should connect to the CD1010 monitor output or filter output for a smoother indication.
11 Apr 2018 Wednesday 17:22 [carter] The helium source heater current meter was unstable and has been replaced with a new meter. The old meter had been calibrated to read (heater current / 2) and the new meter will read the actual current in the heater. Temporary calibration currents for the new meter for operating current and standby current are posted on a note located near the meter. When the values are finalized, a new permanent note will be posted.
05 Apr 2018 Thursday 08:10 [Devon] Source cooling water was down to the alarm level. Added water to loop. Alarm light did not clear to off. Tweaked the pot on the sensor power, alarm light cleared.
22 Mar 2018 Thursday 08:24 [Devon] 15L chamber ion gauge developed a leak at one of the filament/grid feedthrus. Replaced.
21 Mar 2018 Wednesday 10:38 [carter/jacobs] Alpha source 24 volt control and TC gauge supply had bad filter cap. Was reading only 20 volts with 4 volts ripple. Capacitor replaced and output voltage restored to 26 volts when in circuit and loaded. Symptom was high reading of filament vacuum on alpha source.
19 Mar 2018 Monday 16:46 [Devon] Alpha source cleaned. Replaced filament vacuum TC gauge.
15 Mar 2018 Thursday 11:03 [carter] Analyzing magnet would not run down. Found Q6 mounting screws (collector connection) had become loose. Tightned and all OK again. May have been cause of intermittend analyzer magnet instability seen once in previous run.
14 Mar 2018 Wednesday 15:40 [carter] In an effort to add stability back to the slit control mode of the TPS, the following adjustment parameters were restored to the factory default values for the slit control system. R6, slit gain modified from 5.0 to 3.1. R12, slit/cpo gain modified from 8.0 to 5.1. R13, slit/cpo crossover frequency modified from 5.0 to 5.8. These adjustments will lower the gain of the slit control system and increase the 3db slit low pass from 8hz to 10hz. Hopefully will restore some stability in slit operation. Some beam/focus combinations were causing oscillations in the control system and required running the control gain at quite low values for stable slit operation.
20 Feb 2018 Tuesday 10:51 [Devon] The current meter/feed wire to chain 3 was laying on the floor. Blue gauge crimp-on ring connector fatigued and broke. Don replaced it with a yellow gauge ring connector, heavier construction. The door is sealed. Gas in Wednesday.
16 Feb 2018 Friday 12:15 [Devon] We lost telemetry from chain 3 during the run today. The terminal dropped some and was unstable. The experiment has been suspended. Gas out Monday.
29 Jan 2018 Monday 11:37 [RSO] accumulated shut down was experienced due to excessive time needed to complete annual calibrations of fixed monitoring system and two hand held neutron detectors
23 Jan 2018 Tuesday 15:41 [Devon] Comfort chiller woes...chiller quit working over winter break, touch screen controls fried preventing operation. FM went ahead and replaced old water pump while chiller was down. Dry loop and cold weather during pump change liberated a great deal of rust in the pipes. Trane replaced the controls but chiller kept shutting down due to poor flow, rust plugged strainer screens, 3.8A on pump motor. Flushed and cleaned screens a number of times, pump flow improved, 4.4A on motor, chiller running. Measured 120-140 gpm with sonic flow meter while air bubbles were circulating. Coils on chiller cleaned. Will continue to monitor motor amps and flush strainers for a few days.
19 Jan 2018 Friday 15:56 [Shiv Subedi] I passed the operator 2 certification with flying colors. :)
12 Jan 2018 Friday 16:14 [Carter] NMR head maintenance. Replaced weak tubes V01 (6922) V02,03 (7788). V04, 05 (5751) OK. Replaced electrolytic capacitors in RF head and stepping motor controller. Also replaced stepping motor because of intermittent lock-up of shaft. Found gears worn and in need of new lubrication. New stepping motor installed. Added correction factors for nmrgoto up and down to restore calibration. Now have very nice NMR signal with original amplitude and symmetry restored. Also lower noise level.
09 Jan 2018 Tuesday 12:21 [Devon] Process chiller loop #1 problem traced back to the pressure switch that controls the fan. Contacts had developed corrosion since it doesn't get used much. Sprayed with LPS lubricant and exorcised the mechanical settings. Fan contactor working smoothly after 2 run cycles.
08 Jan 2018 Monday 10:55 [Devon] I transposed the numbers 3 and 1 in the previous post. #1 is the big circuit, #3 is the small circuit.
07 Jan 2018 Sunday 14:36 [Devon] The process chiller got too cold to run Saturday night. As it warmed up Sunday morning there was some odd behavior, it kept trying to use the big circuit, #3, over and over. I found the #3 pressure driven fan contactor trying to engage and chattering, fan was starting and stopping. I suspect compressor #3 was shutting down on high pressure due to the lack of a fan and never reaching its set point, but, keeping the water below the activation temperature for loops #1 and #2. I've disabled loop #3 and loop #1 has resumed functioning, assume #2 will function if called. Need to investigate the #3 fan contactor and pressure switch this week. And the ACPC CB3 tripped on activation again.
02 Jan 2018 Tuesday 09:44 [Devon] The week before Christmas break we successfully installed new CTI cryopumps and compressor on the HE end of the vault, and replaced the LE tube gate valve.
02 Jan 2018 Tuesday 09:19 [Devon] Pelletron hour meter reading 1/2/2018: 5161. Accelerator operating hours in 2017: 742.
22 Dec 2017 Friday 14:49 [DCI] Pressure between switcher and analyser fallen to 7E-6. If I open to 15degL it falls to 6E-6. Pressure in 15degL rose from 8E-7 to 1.6E-6. If there is a leak from the 45degR it is small.
26 Nov 2017 Sunday 15:24 [Shiv Subedi] Alarm was on for the 'phase failure' in the E1 console and the 'Tritium monitor'. I pressed the 'ack' button in the E1 console and reset button in the tritium monitor. Both of the alarms then went off.
06 Nov 2017 Monday 13:48 [Devon] We are declaring victory on the process chilled water main loo pump. Everything is back to normal with an up-sized motor. A more detailed write up is available in the logbook.
06 Nov 2017 Monday 13:47 [Devon] The 1 hp motor on the process chilled water main loop pump failed spontaneously on a Sunday at 5 pm. Didn’t realize it until Tuesday afternoon when it was noticed the chiller was not running. The alarm threshold was set just below the temperature reached during city water dump cooling. The dump valve opened automatically at a loop temp of 56F and maintained the vacuum systems. The pump bearing assembly had run dry on its oil bath lubrication and the extra drag likely contributed the motor failure. Proceeded to order a replacement 1 hp motor and installed it, also added oil to bearing assembly. The motor was sluggish to start but then ran. Kept an eye on it and found the motor body was 200F after half hour of operation. Shut it down and began to work on replacing the bearing assembly. However, found that the existing bearing assembly and the new one both had basically the same amount of drag when turned by hand. Some, but not much, drag. Put the new motor back on and measured current draw. The new motor was spec’d for 115/230 V, we have 208V. Normal full load at 230V rating is 4.4Amps. We extrapolate that this would be 4.9A at 208V. We measured 5.5A at 208V. Got a transformer to provide 230V and measured 4.6 A at full flow. This motor is working at its 1.15 safety factor limit. The flow in the loop was reduced by partially closing a valve until the current draw by the motor was just below the normal full load reading. In the mean time we used the measured current draw at full loop flow to determine that full flow required 1.3 hp. Ordered a 1.5 hp motor. The bigger motor has been installed and the loop is now flowing at full flow again, motor is drawing 7.5 Amps. 1.3hp/1.5hp = 87%. Rated full load current at 208V is 8.4 A. 7.5A/8.4A = 89%. The full flow load in this loop would appear to be 1.3 hp, too much for the old motor, but not working the new motor too hard.
02 Nov 2017 Thursday 14:00 [Devon] Process chilled water update. A new motor was ordered and installed. The old motor was repaired and works again too. The new motor ran the pump but motor and bearing housing became quite warm after 1/2 hour of operation. Motor is shut off and pump disassembly is underway to replace the bearing assembly.
02 Nov 2017 Thursday 07:23 [DCI] The high water temp/air alarm was sounding this morning and Janitor reported to the police, who called me in. I have disconnected the alarm and reset it. David Ingram
31 Oct 2017 Tuesday 16:53 [Devon] The process chilled water main loop pump quit running sometime this morning. There were no alarms due to...long story. Initial investigation seems like a motor failure. More diagnostics in the morning. We are dumping city water to cool vacuum systems. No magnets, no running until its repaired.
22 Sep 2017 Friday 12:28 [carter] tube lens voltage and tube lens current have been added to the logging webpage plots.
21 Sep 2017 Thursday 16:17 [carter] The settings logger has been upgraded to include the tube lens voltage (tandem.tube_lens_voltage) and tube lens current (tandem.tube_lens_current). The tube lens current is now subtracted from the total LE tube current to indicate only the tandem component off the LE tube current. The currentsum will also indicate correctly again with the Glassman supply. If we return to the Dell supply, the software will need to be modified OR the metering leads on the back of the tube lens control panel (move metering #7 to metering #8, this will log 0 for the lens current).
18 Sep 2017 Monday 09:56 [carter] Any operator that is not NMR certified and would like to be NMR certified should arrange with don for the training. I would hope to complete the training in 1 about hour. Let me know when you are available this week if possible.
17 Sep 2017 Sunday 09:35 [carter] The analyzing magnet power supply has been repaired. Symptoms were that the variac would run down at turn on (normal, run down to lower limit) then activate standby. When supply was turned on the variac would slowly run up some but stop before getting to the 9 volt collector bus pre-regulated voltage. Cause was shorted Q8 causing continuous attempt to run down. Q8 replaced and now supply appears to be functioning normally again. Also, initialy Devon found a blown primary fuse and it was replaced.
12 Sep 2017 Tuesday 10:52 [Tom Massey] We have had problems with the analyzer magnet starting last night. The symptom was that the NMR was not stable. The operator recycled the magnet several times to try and fix the problem. Eventually the NMR was stable enough to continue. This morning the analyzer magnet was found turned down. The magnet was recycled. When it was turned up to the current value for the NMR desired, the magnetic field was much lower than expected. The magnet was recycled again and the current was noted as as maximum of 50 amp rather than 250 amp. The deflection was switched to check for a control problem. The interlock would not come on for either the right or the left deflection. Don Carter was called and he suggested that the problem was due to a blown fuse. Devon checked and replaced the fuses on the analyzer magnet. There was one fuse that was clearly bad. The analyzer magnet now goes to standby and will not interlock. A visual inspection shows several blow resistors. These may be in an abandon part of the circuit or in the current setup.
06 Sep 2017 Wednesday 15:09 [Devon] Athens Fire Department has a training event scheduled here on Thursday, 9/28. Pre planning and confined space rescue.
06 Sep 2017 Wednesday 09:58 [Alexander] Dear operators, we are starting the experiment and need your help with shifts. Please sign up. Thanks !
30 Aug 2017 Wednesday 17:02 [Devon] The tunnel door is repaired.
24 Aug 2017 Thursday 16:27 [meisel] The wireless phones are now back in action and can be used to communicate between the target rooms and the control room.
23 Aug 2017 Wednesday 16:53 [carter] To connect the tube entrance lens to the old Dell power supply follow the following procedure. The Dell supply is located in the pit, near the accelerator tank. 1. Make sure the power to the glassman and Dell supplies are off. The Glassman power switch is located on the front of the supply in the vault. The Dell supply power should be turned off at the circuit breaker on the back of the lense supply control panel in the control room. Leave the Glassman switch OFF when using the Dell supply. In the control room on the back of the tube entrance lens control panel, on the upper terminal strip, replace jumper connections from terminals 1-4, 2-5 and 3-6. This will connect the front panel voltage control pot to the Dell control input. Disconnect the WIRES labeled 4, 5 and 6 from the terminals labeled 4, 5 and 6. This will disconnect the glassman voltage control input to the front panel voltage control pot. Replace the screw-on twinax connectors on J-01, J-02 and J-03 connecting the front panel current and voltage meters from the Dell supply. Disconnect the WIRES labeled 7,8,9 and 10 from terminals 7,8,9 and 10. This will disconnect the glassman current and voltage monitor outputs to the control room panel meters. Now remove the black HV cable from the glassman power supply to the tank and ground the center pin for safety. Connect the large HV cable from the Dell supply to the tank tube lens supply connection where the glassman connection was just removed. Make sure the voltage control in the control room is at zero and turn the circuit breaker on the back of the control room lens supply control panel ON and press the power-on push button. You should be able to control and monitor lens voltage from the control room tube lens voltage control using the Dell supply.
23 Aug 2017 Wednesday 16:51 [carter] To connect the tube entrance lens to the new glassman power supply follow the following procedure. The new glassman 40 KV 7.5 mA supply is located in the small rack enclosure in the vault room across from the pelletron chain drive starter box, near the accelerator tank. The only control on the front panel is an off/on rocker switch that is illuminated when the supply is on. 1. Make sure the power to the glassman and Dell supplies are off. The Glassman power switch is located on the front of the supply in the vault. The Dell supply power should be turned off at the circuit breaker on the back of the lens supply control panel in the control room. Leave this breaker OFF when using the glassman supply. In the control room on the back of the tube entrance lens control panel, on the upper terminal strip, remove jumper connections from terminals 4,5 and 6 but leave in place connected to terminals 1,2 and 3. This will disconnect the front panel voltage control pot to the Dell control input. Connect the WIRES labled 4, 5 and 6 to the terminals labeled 4,5 and 6. This will connect the glassman voltage control input to the front panel voltage control pot. Remove the screw-on twinax connectors on J-01, J-02 and J-03 isolating the front panel current and voltage meters from the Dell supply. Connect the WIRES labeled 7,8,9 and 10 to terminals 7,8,9 and 10. This will connect the glassman current and voltage monitor outputs to the control room panel meters. Now remove the large black HV cable from the Dell power supply to the tank and ground the center pin for safety. Connect the HV cable from the glassman supply to the tank tube lens supply connection where the Dell connection was just removed. Make sure the voltage control in the control room is at zero and turn the power switch on at the glassman supply in the vault. You should be able to control and monitor lens voltage from the control room tube lens voltage control.
23 Aug 2017 Wednesday 16:47 [carter] The Dell tube entrance supply has been repaired and is functioning properly again. It is now available for use but we are currently using the Glassman supply. The Dell supply is kept in reserve in the event of a Glassman supply failure. The instructions for switching between the supplies will follow this log entry. Switching supplies should take about 15 minutes. Currently when using the Glassman supply, the LE tube current will indicate the sum of the lens supply plus the LE tube current. This will upset the current sum monitoring as the real LE tube current will have to subtract the Glassman lens supply current. A future modification to upgrade the logging and monitoring will be made to automatically subtract this lens current from the LE tube current. While using the Glassman supply the power push-button on the lens control panel is not used and power is controlled by a switch on the front of the Glassman supply located in the vault.
23 Aug 2017 Wednesday 15:13 [Dominik] I have completed my operator 2 training!
22 Aug 2017 Tuesday 10:30 [Devon] wifi phone network settings: How to update your Cisco 7925g telephone's WiFi network name Visit https://www.ohio.edu/oit/telephone/faq.cfm for a version of these instructions that includes screen shots of your phone's setup screens. 1. Turn your phone on. 2. Once the phone is on and registered with a phone number, press your phone's Down navigation button to open up Settings. 3. Choose Network Profiles. 4. Select the first profile in your phone's list. It will be named either OU Wireless or Profile 1. 5. Press View. 6. Choose WLAN Configuration. 7. Press View. 8. Wait until your phone displays its WLAN Config screen, then press * * # (in that order) to enable the Change button. 9. Choose SSID and press Change. 10. Replace voip with OHIO University (Make sure to use the exact same capitalization and spelling.) 11. Press Options, then press Save. 12. Choose Security Mode and press Change. 13. Choose PEAP. 14. Press Options, then press Save. 15. Choose UserName and press Change. 16. Enter your OHIO ID. 17. Press Options, then press Save. 18. Choose Password and press Change. 19. Enter your OHIO password. 20. Press Options, then press Save. 21. If you are responsible for more than one phone in your area, you will need to follow the above steps for each one of those phones.
18 Aug 2017 Friday 16:39 [Devon] The wifi cordless telephones in the control room, large target room, vault, and tunnel will likely not work starting Saturday, 8/19. We've been trying to resolve this with IT but were unable to get a solution from IT by the Friday deadline. Will advise when they are working again.
15 Aug 2017 Tuesday 14:48 [Devon] The accelerator and the 15L chamber are back in service. Tank opening notes are available in the logbook.
15 Aug 2017 Tuesday 14:30 [Devon] Tank opening, 4987 hours. Investigation of the negative and unstable upcharge on chain 3. The pulley had shifted sideways on the motor tray due to the bolts on the forward bearing pillow block working loose. There was very little clearance between the chain and the (+) electrode, the chain pellets were striking the electrode. Both the electrode and the pellets suffered chafing. The electrode was sanded clean, NEC suggested sanding and cleaning the chain, but the chafe was not very rough so we left it in place. We will monitor chain performance. The pillow block bolts and holes had grease that had weeped from the bearing above, guessing that helped them work loose. Cleaned as much grease as possible from the holes, installed new bolts with a healthy dose of vibra-tite. The chain 3 motor tray has a static height of 2-7/16" at the alarm micro switch. The switch should activate at around 1-11/16". After a 3/8" drop when running, that leaves 3/8" more before alarm activation. If the chains continue to stretch 3/16" every 2000 hours, we should not see a chain stretch alarm until around 9000 total hours. Chain measurements as follows: Chain 1 static 1-7/8". Previous 2-1/16". 3/16" stretch in 2000 hours, same stretch as the 2000 hours before that. Chain 2 static 1-15/16", previous 2-1/8". Chain 3 static 1-1/16", previous 1-3/16". Chain 1 running 1-9/16". Chain 2 running 1-5/8". Chain 3 running 11/16". The chains have stretch enough that we can remove a link at any time. The chain stretch alarm electronics were found to be fried. The signal had to be moved to E1 panel slot #9. We will add a circuit check to our quarterly test routine.
11 Aug 2017 Friday 16:23 [Devon] The fire alarm was due to a vacuum system malfunction on the 15L chamber. There is a slight smell of burned oil and obviously there was a vapor cloud that was readily visible to the fire alarm optical scanners. The roughing line to the chamber is filled with a clear liquid. The roughing pump still has a full charge of oil. The 15L chamber is out of service until further notice.
10 Aug 2017 Thursday 12:56 [carter] TOF spectrum indicated beam events out of the normal beam burst period, down by about a factor of 1000 but appearing as wrong time by as much as 50 ns. Re-tuning chopping and bunching controls had little if no effect. Went back to DC tune and found low energy X (2X or inflection magnet) was not peaked. Tuning inflection magnet with 2X set at 5.0 gained about 30% more beam. Chopped and bunched after DC tune and found the out of time blob was not present anymore.
04 Aug 2017 Friday 16:49 [carter/ingram] A test was made of the chain charging current monitoring system by injecting a known current (100 uA) at the tank feedthru for each of the three chains. All chain current meters read a stable 100 uA so it appears that the chain current monitoring system outside the tank is functioning properly.
04 Aug 2017 Friday 13:07 [Devon] There is a malfunction in the accelerator charging system. The charging controller is reporting negative charge on chain 3 and the total upcharge is erratic. However the terminal voltage seemed unaffected. Did a quick check with chain 3 running alone, sounded like it was running, and the terminal rose when suppressor/inductor voltage was applied, although the terminal power supplies were not in play since the generator was not being driven. We have switched to running with chains 1 & 2 only in hopes of finishing the C12 run. The charging readings are stable but the suppressor/inductor voltages are higher to compensate for the lack of chain 3. This configuration limits our maximum voltage to a TBD value. Further evaluation will be needed to see if we need a tank entry, or if this is an external metering problem.
26 Jul 2017 Wednesday 09:35 [devon] The sputter source developed a dead short on the target plane last night. I tried the reaming probe thru the target air lock but that didn't clear the short. This morning I vented the source and removed the target plane with argon flowing. Found: 1) precipitate plating on one of the ionizer straps had broken loose on one end and curled inwards in a springy fashion to touch the outside of the cathode sheath; 2) the insulator was clean and unstressed. Precipitate was vacuumed out of the ionizer cavity and source sealed up. When the source recovers to high vacuum it will be activated and a new D pellet installed since the current one is near the bottom. Watch the status page for beam production...
25 Jul 2017 Tuesday 16:31 [Tom Massey] Cody Parker, Doug Soltez and Shiv Subedi have completed "Tritium Awareness "Training.
21 Jul 2017 Friday 12:31 [Devon] The massive tunnel door has suffered a major failure and is inoperable. Investigation and repair planning is underway, but this will not be a very quick fix. Accelerator and source shut down.
20 Jul 2017 Thursday 15:31 [Justin Warren] I completed Operator 2 training!
17 Jul 2017 Monday 15:31 [Doug Soltesz] Wanted to let everybody know that I completed my operator 2 training. WOOOO!
11 Jul 2017 Tuesday 12:03 [Devon] Replaced the ECO O2 sensors on the VESDA system. Next set due for replacement by 6/20/2019. Order from Orr Protection, not Simplex. Simplex order was at 12 weeks and they couldn't provide any status. Orr order was 3 1/2 weeks.
06 Jul 2017 Thursday 19:51 [Tom Massey] We have completed the measruements for Daren Bleuel from LLNL. Thanks to everyone who has helped in this work. Especial thanks to Don Carter and Devon Jacobs for perservering through all of the problems.
06 Jul 2017 Thursday 16:39 [Tom Massey] I wish to note that we started with a 33 microampere beam of deuterons in the LE cup this morining. This is very goood source performance.
05 Jul 2017 Wednesday 18:27 [Tom Massey] Around 6:15, the sputter source tripped off. The Emergency off button was red, the Dell High voltage and the Glassman high voltages were off. No alarms were sounding. There was lightning from the thunderstorm. A possible cause. Target and Extractor buttons pushed to drop the voltage on startup. Ionizer turned to 10 A. Cs Resivoir and Cs Feed turned off as temperature dropped.
05 Jul 2017 Wednesday 08:09 [Devon] SF6 alarm was sounding this morning. Did a quick leak check before starting the source, tank joint is giving a good hit. Mechanical gauge says we are down 1 psi since last gas transfer. HVAC trouble may be contributing too.
04 Jul 2017 Tuesday 09:59 [Devon] The chiller was factory repaired Monday evening and is functioning normally. Lab systems (except for the 15L chamber) are back to normal and the run can resume as soon as beam comes up Wednesday. The 15L chamber seems to have a pretty good leak somewhere.
03 Jul 2017 Monday 12:59 [Devon] Chiller: Factory service did not show up as advertised today. Unclear why, or when they will, but Wednesday perhaps? Many people on holiday today. The chiller has been running at 50% today, but no guarantee it will stay that way until it is repaired. We continue to keep proccess sytems in a warm water state...
02 Jul 2017 Sunday 09:07 [Devon] The chiller prediction was correct, it shut down. All process chilled pipes dripping with water. Raised all the sub loop temperature settings to get above dew point. Turned off magnets. Analyzer cryo pump seems to have crashed. Valved off and turned off 15L diff pumps since they may not have liked the higher water temps.
01 Jul 2017 Saturday 13:55 [Tom Massey] The emergency crew has done what they can and have called TRANE to be here on Monday. They are unable to clear completely two sensors to allow the unit to run. One is the high pressure cuttoff and the other was the High Pressure in the Coolant Inlet. They have checked the coolant pressures and have made up for any lost coolant. They were unable to connect to the controlling program to reset the system. The chiller has been restarted but is not expected to run long. We will not try to run until Monday.
01 Jul 2017 Saturday 12:39 [Tom Massey] Facilies management has sent three people to work in the Comfort Chiller. The HVAC person in Jeff. The codes read out as high intake pressure. The screens were cleaned, an inline water filter was taken out and cleaned. Make up water was added. They are working on the controls. They are having trouble keeping the chiller running under controls.
01 Jul 2017 Saturday 10:27 [Tom Massey] The comfort chiller has stopped working. The chiller is now warming up. The facilities management emergency number was called and we are waitng for someone to come.
30 Jun 2017 Friday 20:44 [Devon] Darren B. came back from dinner to find the source low flow alarm active. The cause was that the source water pump turned off for some reason, which takes out the source power platform. Nothing else in the building went out. There are reports of a sizeable AEP outage in the area. The pump restatred and continues to run. The source is back on to continue running in the new pellet.
30 Jun 2017 Friday 18:31 [Devon] We changed the source pellet and beam production stalled. Shut down the accelerator and closed gate valves. Letting source run overnight. Beam meter is on 10 uA scale...
29 Jun 2017 Thursday 21:55 [Andrea] The Emergency Off button near the Swinger was pressed while attepting to align the targets in the chamber. This was unintentional and the alarm condition has been reset.
28 Jun 2017 Wednesday 15:58 [Devon] The beam in the swinger became unstable and eventually unusable last evening. The solder link alarm was activating when the swinger cup was operated. Inspection of the swinger cup this morning found that the current lead wire had broken by fatigue. The cup was charging and discharging since it was floating electrically. To compound the issues, the lead wire had a fiberglass insulating jacket on it, and the loose wire and jacket just happened to come to rest on the beam axis blocking beam. Situation has been corrected.
23 Jun 2017 Friday 13:47 [Devon] The beam line is repaired and the leak check was non-detect. We had a bellows section that used to be on the swinger when it had a cryopump. The tubes will need to be monitored and conditioned while going up in voltage next week.
22 Jun 2017 Thursday 15:53 [Devon] There is a vacuum leak in a bellows section of beam pipe at the HE end of the accelerator. The accelerator controls have been disabled and the cryopumps valved off. The leak will vent the tubes to atm overnight for repairs tomorrow.
22 Jun 2017 Thursday 14:47 [Devon] Sputter source cesium reservoir ran dry, bone dry. Glass shards were crystal clear. Feed tube clean. Replaced Cs. Last load was Sept 2016.
15 Jun 2017 Thursday 15:43 [Devon] The police now have access to the restricted area door at the bottom of the main stairs. The police, or the fire department, will only enter the restricted area in certain emergency situations. Otherwise they will wait in the lobby for an operator or keyholder as before. You may see the Standard Operating Procedure (SOP) for when they can and can't enter in the Handbook, Emergency Procedures section. Please read it. There is also a new Emergency Off button by the drinking fountain. It is for them to use if they need to come in and the accelerator is still on with no operator available. You can of course use this button on your way out if something is forcing you to flee the control room.
14 Jun 2017 Wednesday 11:16 [devon] It appears that 120 C is the maximum temperature for producing a carbon beam with the sputter source. Tried 125 and extractor current surged too high.
07 Jun 2017 Wednesday 15:57 [carter] Test message sent to "all operators list" including new operators.
04 Jun 2017 Sunday 06:37 [carter] Modified Tank Volume SF6 hi-res plot on real-time web page to display 32-36 instead of 33-37 bottles SF6.