Accelerator Update for August 22, 2008 - August 25, 2008

Friday August 22

The day shift began with Operations monitoring the Tevatron (TeV) store 6373 (132.02E30), the Recycler (RR) stash (74.8E10), and the Antiproton Source (Pbar) stack (29.2E10), with Linac off due to work on a RF station (LRF4), with Booster and the Main Injector (MI) waiting for beam from Linac, with the Collider Detector at Fermilab (CDF) and DZero (D0) using the colliding beams, and with the MiniBooNE, NuMI, and the Meson MTest experiments not taking beam due to LRF4 problems.

A controls expert reported at 8:22 AM that he did some cable changes for MDAT and TCLOCK to fix the time jitters on two quadrupole power supplies (QF107 and QF12).

At 10:52 AM, LRF5 tripped off for the first of two times in 10 minutes. It reset.

The Neutron Therapy Facility (NTF) reported at 11:33 AM that they had treated their last patient for the day.

At 11:45 AM, Operations reported that LRF4 continued having problems. Experts continued to investigate.

Operations reported at 12:41 PM that Pbar, NuMI, MiniBooNE, and MTest were all getting a small amount of beam.

Operations terminated store 6373 at 1:05 PM.

The Run Coordinator reported at 1:15 PM that he was allowing cryo system experts to work on the TeV sector F4 wet engine and power supply experts to work on the TeV sector B3 bypass switch. CDF and D0 will be allowed to access their collision halls.

Operations prepared D0 and CDF for access at 1:34 PM.

At 2:12 PM, a Linac Klystron RF station (KRF7) tripped off. It reset.

At 2:15 PM, the TeV sector B1 air compressor tripped off. It reset.

At 2:57 PM, a quadrupole power supply (QF12) caused the P2 transfer line beam permit to trip. Everything reset.

Operations reported at 4:03 PM that the Recycler had stashed antiprotons two times during the day shift.

D0 came out of access at 4:08 PM.

Power supply experts reported at 5:07 PM that they had completed the TeV sector B3 knife switch replacement.

CDF came out of access at 5:26 PM.

At 6:48 PM, the TeV sector B1 air compressor came into alarm. Operators responded and then called in experts. The backup compressor was valved in during repairs.

Cryo system experts reported at 7:44 PM that they had completed wet engine bearing replacement at TeV sectors B4, C1, and E1 & 3.

Mechanical support technicians reported at 8:07 PM that they had completed their work on the B1 air compressor.

Cryo system experts reported at 8:34 PM that they had overhauled the wet engine at TeV sector F4.

Operations disabled the MTest beam at 9:06 PM.

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

Saturday August 23

The midnight shift began with Operations monitoring the stash (281.7E10), with the Pbar stacking (45.1E10), and with the MiniBooNE and NuMI experiments taking beam.

Operations put the TeV through a wet squeeze at 12:18 AM.

Operations put the TeV into shot setup at 1:50 AM.

Operations established store 6377 at 3:23 AM with an initial luminosity of 263.01E30.

Operations established beam to MTest at 4:21 AM.

At 4:33 AM, a Linac Klystron RF station (KRF2) tripped off. It reset.

At 7:07 AM, the TeV sector B11 separator sparked. About 40% of store 6377’s luminosity was lost.

Operations reported at 8:10 AM that the Recycler had stashed four times during the midnight shift.

At 9:19 AM, the Booster tripped off due to a beam detector trip. The detector tripped off due to an air conditioner drain that was running into conduit that protected data cables going to the detector, which was located in a pit. Operators replaced the detector and diverted the water away.

Booster resumed sending bean at 9:58 AM.

At 11:26 AM, the Pbar Sweeper magnet “A” power supply tripped off. It reset.

At 1:59 PM, QF12 took down the P2 transfer line beam permit. Everything reset.

At 2:06 PM, KRF5 tripped off. It reset.

Operations terminated store 6377 at 4:36 PM.

Operations put the TeV into shot setup at 4:48 PM.

Operations established store 6378 at 6:23 PM with an initial luminosity of 252.39E30.

Operations reported at 8:01 PM that the Recycler had stashed eight times during the last 12 hours.

At 8:22 PM, QF12 tripped off the P2 line. Everything reset.

Sunday August 24

The midnight shift began with Operations monitoring store 6378 and the stash, with Pbar stacking, and with the MiniBooNE and NuMI experiments taking beam.

At 4:14 AM, LRF2 tripped off for the first of two times in 22 minutes. It reset.

Operations established beam to MTest at 4:28 AM.

At 5:12 AM, BRF16 tripped off for the first of two times in about an hour. It reset.

At 7:29 AM, LRF3 tripped off. It reset.

Operations reported at 7:55 AM that the Recycler had stashed eight times during the last 12 hours.

At 8:41 AM, BRF16 tripped off. It reset.

At 9:31 AM, QF12 tripped off the P2 line for the first of three times in a bit over an hour. It reset.

Operations terminated store 6378 at 12:52 PM.

Operations put the TeV into shot setup at 1:03 PM.

At 2:04 PM, KRF7 tripped off. It reset.

Operations established store 6379 at 2:46 PM with an initial luminosity of 286.65E30.

At 3:54 PM, Operations reported that MIRF1 had tripped off twice. It reset.

Operations disabled the MTest beam at 6:02 PM.

Operations reported at 8 PM that the Recycler had stashed seven times during the last 12 hours.

At 9:08 PM, QF12 caused the P2 line to trip off for the first of two times in about two hours. Everything reset.

At 11:03 PM, BRF16 tripped off. It reset.

Monday August 25

The midnight shift began with Operations monitoring store 6379 and the stash, with Pbar stacking, and with the MiniBooNE and NuMI experiments taking beam.

At 12:16 AM, LRF4 tripped off for the first of two times in 19 minutes. It reset.

Operations established beam to MTest at 4:28 AM.

At 4:59 AM, MIRF5 tripped off. It reset.

At 5:41 AM, BRF16 tripped off for the first of two times in 90 minutes. It reset.

Operations reported at 8:02 AM that the Recycler had stashed eight times during the last 12 hours.

The Plans for Monday

The plans for today are to stack, stash, and store.

Accelerator Update Archive

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