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ID Date Author Operational Mode Subject   266   Wed Dec 10 15:44:58 2008 Doug Preddy Maintenance Repairs to solenoid power supply Klaus and company pulled the ramp rate card out of the solenoid power supply. Operational checks were done and the rate switch was cleaned. The card was reinserted and the ramp rate was checked. The power supply seems to ramp at a proper rate in all positions. ***Note*** The output voltage of the power supply is proportional to the ramp rate. The faster the ramp rate the higher the output voltage.   265   Wed Dec 10 15:41:04 2008 Doug Preddy Shut Down shuttting down solenoid shuttting down solenoid for winter shutdown.   264   Wed Nov 5 16:33:52 2008 Doug Preddy Normal Running sbplc light out On main menu the sbplc light was black. All vacuum systems looked good, but there was no control of any device. Jane reset the IOC. It is hosted by sundance.   263   Sun Oct 5 18:54:27 2008 Doug Preddy Quench Recovery Solenoid Quench ~16:30 Restarted compressor and flow to coldbox by 18:30   262   Sun Oct 5 11:12:48 2008 Doug Preddy Normal Running M9B:V1 interlocks and a IOC crash M9A:V1 was removed this shutdown. It's "in" limit is required to allow M9B:V1 to be opened. I have bypassed the interlocks on M9B:V1 until the M9A:V1 limits can be jumpered. Don Dale and George Clark have been informed. Also an IOC crashed so the data pages were not updating. Evgeny rebooted the IOC. All is now fixed.   261   Fri Sep 26 09:50:18 2008 Doug Preddy Quench Recovery started flow in parallel cold return mode   260   Fri Sep 26 09:45:18 2008 Doug Preddy Quench Recovery Solenoid quenched at 7:50 Compressor on. Turbines started. Vacuum system recovering.   259   Fri Sep 26 09:44:25 2008 Doug Preddy Maintenance Water flow interlock restored yesterday   258   Tue Sep 9 15:04:23 2008 Doug Preddy Maintenance Jumpered interlock for diff pump water flow Jumpered interlock for diff pump water flow in Proteus box.   257   Thu Sep 4 10:02:55 2008 Doug Preddy Normal Running ramping down solenoid Solenoid power supply will be turned off for Fall shutdown.   256   Sun Aug 24 06:45:14 2008 Doug Preddy Quench Recovery switch to series mode   255   Sat Aug 23 17:02:38 2008 Doug Preddy Quench Recovery Solenoid quenched The solenoid quenched this afternoon at ~12:30. The compressor shut down. Fault lights were cold box trip. Restarted the compressor by 3:30 and started flow to the solenoid by 4:15. Peter Yandon came down with Ops' radio to investigate the radios may trip the solenoid. When the radio is keyed the vacuum guages jump. CG1, CG5 and the pirani gauges. This would trip of the refrigerator. More investigation to happen tomorrow and on maintenance day.   254   Sat Jul 26 01:29:21 2008 Doug Preddy Quench Recovery power leads ops will monitor liquid level. When it's at 60% they will come down and open the power lead valve. When the temperature ripples die out the solenoid can be energized.   253   Sat Jul 26 01:06:04 2008 Doug Preddy Quench Recovery Refrigerator in series mode Switched to series mode. Solenoid ~8K, starting to build liquid.   252   Fri Jul 25 21:48:15 2008 Doug Preddy Quench Recovery another quench System was stable and solenoid ramped up at 4:00 today. At about 7:30 it tripped off again. I came in and restarted the compressor and am now cooling in parallel cold return mode. Solenoid is at ~30K. I talked to Kevin and he will get the power leads on tomorrow morning. Once they are stable the power supply can be ramped up. I phoned Curtis, but there was no answer (he may be on holidays??)   251   Thu Jul 24 16:28:50 2008 Doug Preddy Quench Recovery power bump There was a power bump at ~15:00 today. All mseon hall cooling water went off. Compressor tripped. Main magnet went off. Restarted compressor after water pumps came back on. Started flow to the cold box. Compressor outlet pressure went >12 Bar and tripped of the compressor. Restarted again and am now cooling in parallel cold return. Solenoid ~25K.   250   Tue Jul 15 08:47:13 2008 Doug Preddy Normal Running Screen grab of normal running Solenoid was recovered on Sunday July 13. The power leads started to ripple slightly this morning, so I cycled HIC142. No real change. Attachment 1: july_15_08_0841.jpg Attachment 2: july_15_08_0846.jpg   249   Sun Jul 13 20:17:24 2008 Doug Preddy Other Helium refrigerator problems In early June the helium compressor was running with the solenoid cold. A vavlve broke off at the suction side of the compressor. The entire helium inventory was lost. The cold box tripped off, but the compressor did not. It ran for ~ 2 hours before I came in and shut the system down. The valve was repairedby Kevin T and Neil Wong. We ran hot (>100C) nitrogen through the fourth adsorber for one week. The solenoid and cold box were allowed to warm above 273C. The compressor, all piping, cold box, solenoid and buffer tank were pumped and purged with helium three times. Liquid helium was boiled off to pressurize the system to 10 psi and bottled gas was added to allow the compressor to start. We started the compressor and ran the gas through the purifier for three weeks. During the third week we added a second purifier. The purity was not measurable with the meter that we had. An RGA was set up to give some information on the rate of scrubbing. After three weeks the gas purity was better that 2 PPM. The system was cooled down. We added ~ 75 LL of heium via boil off to the system. As the cooling progressed it was noted that the power supply for the 80K shield heater was burnt. An auto transformer was wired into the system and will be used until a replacement power supply can be purchased.   248   Mon Apr 28 09:03:22 2008 Doug Preddy Normal Running power leads warmed during weekend The power lead temperatures suddenly rose on Sunday morning. No rippling occured before the woarm up. I shut flow off this morning for about 10 minutes (until the LHe in went up to 30K) and then open the flow back up. The temperature seem to be recovering.   247   Thu Apr 17 13:52:25 2008 Doug Preddy Start Up switched to series mode at 9:30 this morning switched to series mode at 9:30 this morning. Added two bottles of helium gas. Started flow to power leads.

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