Accelerator Update for August 25, 2008 - August 27, 2008

Monday August 25

The day shift began with Operations monitoring the Tevatron (TeV) store 6379 (63.68E30) and the Recycler (RR) stash (360.5E10), with the Antiproton Source (Pbar) stacking (42.6E10), with the Linac, Booster, and the Main Injector (MI) operating normally, with the Collider Detector at Fermilab (CDF) and DZero (D0) using the colliding beams, and with the MiniBooNE, NuMI, and the Meson MTest experiments taking beam.

At 8:23 AM, a Booster RF station (BRF16) tripped off for the first of two times in 43 minutes. It reset.

Operations terminated store 6379 at 9:02 AM.

Operations put the TeV into shot setup at 9:14 AM.

Operations established store 6380 at 10:50 AM with an initial luminosity of 283.12E30.

Preaccelerator experts reported at 1:04 PM that they were beginning an I- Source cleaning.

At 1:24 PM, DRF1-3 tripped off. Operators investigated, found a failed Glassman 10kV power supply, and then called in an expert.

A Pbar expert reported at 1:48 PM that he had fixed the DRF1-3 Glassman supply.

A MI expert began a five-minute RF study at 2:21 PM.

Operations reported at 4:06 PM that the Recycler had stashed antiprotons five times during the day shift.

A MI expert began a 20-minute coalescing study at 4:44 PM.

Operations disabled the MTest beam at 6:06 PM.

At 6:29 PM, BRF15 tripped off. It reset.

At 8:01 PM, LRF4 tripped off. An operator followed instructions to bring LRF4 back on line. It took 52 minutes to bring the station online and it tripped off twice during the process.

At 8:15 PM, KRF5 tripped off for the first of five times over the rest of the evening shift. It reset.

At 8:56 PM, cryo system experts at CHL reported a problem with the Pbar cryo system. Operators investigated and found a problem with the wet engine. Cryo system experts were called in to investigate further.

At 10:36 PM, BRF16 tripped off. It reset.

Cryo system experts reported at 10:57 PM that the Pbar wet engine had a bad bearing and flywheel. They will begin repairs on Tuesday morning.

At 11:49 PM, BRF10 & 11 tripped off. They both reset.

Operations reported at midnight that the Recycler had stashed four times during the evening shift.

Tuesday August 26

The midnight shift began with Operations monitoring store 6380 (81.26E30) and the stash (251.7E10), with the Pbar stacking (35.9E10), and with the MiniBooNE and NuMI experiments taking beam.

At 4:09 AM, BRF15 and 16 tripped off. They reset.

Operations established beam to MTest at 4:16 AM.

Operations terminated store 6380 at 7:05 AM.

Operations put the TeV into shot setup at 7:07 AM.

Operations reported at 7:58 AM that the Recycler had stashed five times during the midnight shift.

At 8:18 AM, DRF1-3 tripped off and would not reset. An expert reported that its 20kV Glassman power supply had failed.

Operations established store 6381 at 9:17 AM with an initial luminosity of 275.79E30.

A Pbar expert reported at 9:31 AM that he had replaced the power supply for DRF1-3.

A MI expert began a one-hour slipstacking study at 10:15 AM.

A MI expert began a two-hour slipstacking study at 1:43 PM.

A MI expert began a one-hour NuMI study at 1:54 PM.

FESS personnel set up a portable air conditioner at AP50 at 2:06 PM. The fan-coil for the installed unit had failed.

At 3:21 PM, the MI Power Supply interlock Loop tripped off for no apparent reason. Everything reset.

At 3:48 PM, a quadrupole magnet power supply (QF12) had its current sag and caused the P2 transfer line beam permit to trip. Everything reset.

Operations reported at 3:58 PM that the Recycler had stashed four times during the day shift.

At 4:19 PM, the 400 MeV area beam permit tripped off due to mis-positioned beam. Everything reset.

At 4:29 PM, QF12 caused the P2 line to trip off for the first of three times in three hours. It reset.

Operations disabled the MTest beam at 6:25 PM. The experiment, T984, reported that they had completed their test run.

Linac experts completed tuning their beam line at 6:48 PM.

At 9:30 PM, QF12 caused the P2 line to trip off. Everything reset.

At 11:26 PM, BRF9 tripped off. It reset.

Operations reported at midnight that the Recycler had stashed five times during the evening shift.

Wednesday August 27

The midnight shift began with Operations monitoring store 6381 (73.08E30) and the stash (333.9E10), with Pbar stacking (11.6E10), and with the MiniBooNE and NuMI experiments taking beam.

CDF experimenters reported at 12:58 AM that they were turning off their solenoid magnet.

At 1:16 AM, BRF16 tripped off. It reset.

At 2:23 AM, BRF15 and 16 tripped off. They reset.

Operations terminated store 6381 at 2:36 AM.

Operations put the TeV into shot setup at 2:51 AM.

At 3:42 AM, CDF reported that they were not able to ramp up their solenoid magnet due to cryo system problems. They called in experts.

At 4:05 AM, the Linac Klystron Vernier tripped off on a LCW flow fault. It reset.

Operations established store 6382 at 5:17 AM with an initial luminosity of 290.65E30.

At 7:34 AM, BRF9 and 15 tripped off. They reset.

CDF reported at 7:57 AM that they were working on their solenoid power supply.

Operations reported at 8:08 AM that the Recycler had stashed four times during the midnight shift.

The Plans for Wednesday

The plans for today are to stack, stash, and store. The Run Coordinator has scheduled a 10-hour access for CDF on 8/28/08 beginning around 6 or 7 AM.

Accelerator Update Archive

More Information
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