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Accelerator Update for November 7, 2008 - November 10, 2008 |
Friday Nov 7 The day shift began with the Fermi accelerator complex recovering from a scheduled power outage to switch back to the Master Substation. Operators have begun turning on Linac and Booster. The Tevatron (TeV) was still in access. Cryo system experts at CHL reported at 8:12 AM that they had started their nitrogen plant. Operators reported at 8:34 AM that they had successfully hipotted the Main Injector (MI). Operations established a MI ramp at 9:33 AM. Operations and Linac experts established beam to the Linac dump at 12:21 PM. Operations established beam to the Booster dump at 12:24 PM. Operations established beam to MiniBooNE at 1:15 PM. Operations established beam to the MI abort at 1:16 PM. Operations sent protons to the Recycler at 1:49 PM. A TeV expert began conditioning the TeV separators at 2:32 PM. Operations established beam to the Meson M01 enclosure dump at 3:01 PM. Operators reported at 3:12 PM that they had search and secured the Collider Detector at Fermilab (CDF). Operations established beam to NuMI at 3:57 PM. A kicker expert reported at 5:05 PM that the TeV sector A0 abort kickers were in conditioning mode. Operations prepared D-Zero (D0) for access at 5:15 PM. Operations reported at 6:04 PM that they had successfully sent pings to Switchyard (SY). At 8:43 PM, Operations reported that the TeV LCW pressures were dropping all around the TeV. Operators investigated. Later they reported that the TeV sector F3 LCW pump had tripped off. At 9:37 PM, Operators reported that the F3 LCW pump would not turn on. Operations contacted an expert. At 10:11 PM, Operations reported that they were trying to send beam to Pbar, but they could not get it beyond the target. Operations contacted an expert who thought the beam stop might be closed. Saturday Nov 8 The midnight shift began with the TeV recovery underway, and with NuMI and MiniBooNE taking beam. Water experts reported at 1:11 AM that they had turned on LCW pump #2 at TeV sector F3. At 4:31 AM, MI RF station (MIRF13) tripped off for the first of several times on a LCW flow fault. Operators bypassed the station. Operations prepared the Pbar transport area for access at 5:59 AM. At 6:02 AM, Operations reported that they had reset the beam permit for the 400MeV area for the seventh time due to bad beam positions. Operators investigated, but could not find a cause. Operations reported at 6:30 AM that they had prepared the TeV and MI for access. Operations prepared TeV sector F for access at 7:10 AM. Linac experts began a LRF5 study around 8:02 AM. MI came out of access at 8:35 AM. A Meson expert reported at 8:44 AM that the MTest beam line was ready for beam. At 9:28 AM, Operations reported that the West Anode Power Supply would not reset. Operations called in an expert. Operations established beam to the Booster dump at 11:01 AM. Operations established beam to MTest at 12:11 PM. Operations reported at 2:43 PM that Pbar stacked for a short time to prove that it could. Operations took the TeV sector A0 kickers out of conditioning mode at 2:47 PM. Pbar experts began a reverse proton study at 3:29 PM. At 3:43 PM, Operations reported that MIRF17 had tripped off repeatedly. Operators bypassed the station. At 3:48 PM, Operations reported receiving a building alarm for the TeV sector D2 cryo system building. Operators investigated and discovered that a wet engine piston seal had failed and helium blew out into the building. The Cryo Coordinator reported that the engine would require an overhaul. The cryo experts put the system into JT valve mode. Operations disabled the MTest beam at 6:27 PM. Pbar experts resumed stacking at 8:32 PM for a 20-minute study. Sunday Nov 9 The midnight shift began with the TeV recovery underway, and with NuMI and MiniBooNE taking beam. Operations reported at 6:01 AM that the Pbar cryo system was cold and that an expert had begun stacking. Operations established beam to MTest at 6:10 AM. Operations reported at 7 AM that the Pbar stack rate was at 18 mA per hour. Operations reported that the TeV cooldown was progressing. The picture below and on the left showed the temperatures at 8 PM Saturday night; the picture on the right showed them on Sunday at 7:31 AM.
Cryo system technicians reported at 8:17 AM that they were beginning work on the TeV sector D2 wet engine. At 9:55 AM, Operations reported that the MeV 400 area had tripped off for the first of many times over an hour. It reset. Operations put the TeV sector A0 abort kickers into run mode at 11:41 AM. The kickers were run like this for about 2 hours. Pelletron experts reported at 1:26 PM that they were beginning to pump out the SF6 cooling gas to work on the system. At 1:55 PM, Pelletron experts reported a problem with the lens power supply. Operations disabled the MTest beam at 6:05 PM. Operations reported at 7:57 PM that the Recycler had stashed antiprotons five times during the last 12 hours. At 10:40 PM, Operations reported that the Booster West Anode Power Supply (WAPS) had tripped off. Operators reset the power supply locally and heard a “boom.” Operations contacted an expert. Operations reported at 11:14 PM that operators found a problem with BRF16. They bypassed the station from WAPS. Pbar resumed stacking. At 11:30 PM, Operations reported that the modulator for BRF14 would not turn on. Operations called in an expert. A Pelletron expert reported at 11:42 PM that all the cooling gas had been pumped out. They began troubleshooting the Electron Cooling (ECOOL) gun lens power supply. Monday Nov 10 The midnight shift began with the TeV recovery underway, and with NuMI and MiniBooNE taking beam. A Booster RF expert began working on BRF14 and the Booster RF system at 12:03 AM. Pelletron experts reported at 2:11 AM that they had replaced the T1B Box, which contained the lens power supply, but it was not regulating properly. Operations reported at 5:13 AM that the TeV cooldown was progressing well; only TeV sector F1 was still in transition. Operators conducted a hipot.  At 7:39 AM, Pelletron experts reported that the T1B Box they had installed had problems. They were scavenged parts from the original box to repair the second box. A power supply expert reported at 7:59 AM that he brought up the low beta magnet quadrupole power supplies. Operations reported at 8 AM that the Recycler had stashed once during the last 12 hours. The Plans for Monday The plans for today are to bring the TeV up and conduct studies. The next store might occur on the Tuesday midnight shift. |
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