Accelerator Update for May 19, 2008 - May 21, 2008

Monday May19

The day shift began with Operations monitoring Tevatron (TeV) store 6149 (161.47E30) and the Recycler stash (100.9E10), with the Antiproton Source (Pbar) stacking (24.1E10), with the Main Injector, Booster, and Linac operating normally, with the Collider Detector at Fermilab (CDF) and DZero (D0) using the colliding beams, and with the NuMI, SciBooNE / MiniBooNE (BNB), and the Meson MTest experiments taking beam.

FESS personnel reported at 8:34 AM that they were replacing an air conditioner fan motor at TeV sector E2.

At 8:38 AM, a Linac RF station (LRF4) tripped off. It reset.

At 8:45 AM, a Booster RF station (BRF7) tripped off. It reset.

At 8:55 AM, a Linac Klystron RF station (KRF3) tripped off. It reset.

At 9:08 AM, LRF4 tripped off. It reset.

At 11:06 AM, KRF3 tripped off. It reset.

At 1:27 PM, Operations reported a Pbar injection orbit problem to a Pbar expert.

At 1:28 PM, Operations reported that a Linac quadrupole (QPS216) power supply’s current was out of tolerance. Operators adjusted the current.

At 1:43 PM, Operations contacted a Pbar expert about a Pbar Debuncher RF station (ARF1-7); its voltage was drifting low. The expert made adjustments.

At 1:53 PM, KRF6 tripped off. It reset.

At 1:57 PM, Operations reported that the air conditioner at TeV sector E2 had tripped off. An air conditioning technician investigated.

Operations reported at 3:21 PM that TeV experts were moving the D0 beam interaction point.

A Pbar expert reported at 3:28 PM that he had bypassed Accumulator RF station 1-2 (ARF1-2) due to a station problem. It will be repaired.

At 3:45 PM, a Linac quadrupole power supply (QPS106) tripped off. It reset.

Operations reported at 3:50 PM that the Recycler had stashed antiprotons four times during the day shift.

A MI expert began a coalescing study around 4 PM.

At 4:41 PM, KRF1 tripped off. It reset.

At 5:58 PM, the Booster East Anode Power Supply (EAPS) tripped off. It reset.

Operations disabled beam to MTest at 6:02 PM.

At 6:39 PM, KRF2 tripped off. It reset.

At 7:20 PM, KRF6 tripped off. It reset.

Operations terminated store 6149 at 9:55 PM.

Operations put the TeV into shot setup at 10:06 PM.

At 11:37 PM, the P2 transfer line beam permit tripped off due to a correction magnet power supply’s (VTF11F) current going too high. Operators restarted a Pbar autotune program and reloaded a data file.

Operations established store 6150 at 11:49 PM with an initial luminosity of 259.57E30.

Operations reported at 11:57 PM that the Recycler had stashed four times during the evening shift.

Tuesday May 20

The midnight shift began with Operations monitoring store 6150 (240.18E30) and the stash (42.8E10), with Pbar stacking (23.5E10), and with NuMI and BNB taking beam.

At 1:25 AM, ARF1-7 tripped off. It reset.

At 2:42 AM, the Linac Klystron RF vernier tripped off on a transformer LCW flow indication. It reset.

At 3:32 AM, KRF3 tripped off. It reset.

At 3:51 AM, Operations reported that the Recycler VSA wasn’t operating normally. A power cycle fixed the problem.

At 4:24 AM, KRF6 tripped off for the first of two times in one minute. It reset.

At 5:08 AM, KRF3 tripped off. It reset.

Operations established beam to MTest around 6:10 AM.

At 6:26 AM, KRF4 tripped off. It reset.

At 6:29 AM, MIRF18 tripped off. It reset.

Operations reported at 8 AM that the Recycler had stashed six times during the midnight shift.

At 8:36 AM, LRF4 tripped off. It came on about 9 minutes later.

At 8:39 AM, KRF4 tripped off. It reset.

At 8:57 AM, KRF6 tripped off. It reset.

At 11:08 AM, KRF6 tripped off. It reset.

At 12:49 PM, store 6150 aborted; a TeV power supply (AQ7) tripped off. There was no quench.

Operations reported at 1:02 PM that the CDF detector went down around 12:30 PM. They requested a 2-3 hour access.

Operators had D0 and CDF prepared for access by 1:30 PM.

A TeV power supply expert reported at 2 PM that AQ7 had tripped off due to a transformer glitch. He began the repairs.

D0 came out of access at 2:29 PM.

CUB experts reported at 3:12 PM that they were bringing column #3 online.

TeV power supply experts reported at 3:21 PM that they had replaced a bad transductor on AQ7.

Operations reported at 4:05 PM that the Recycler had stashed five times during the day shift.

Operations put the TeV through a dry squeeze at 4:42 PM.

A MI expert completed a coalescing study at 4:49 PM.

TeV experts began a study period at 5:10 PM.

Operations disabled the MTest beam at 6:01 PM.

Operations put the TeV through a wet squeeze at 6:21 PM.

At 8:43 PM, a Booster vacuum pump (IP81) tripped off. It reset.

Operations put the TeV into shot setup at 6:45 PM.

At 6:52 PM, a Linac bulk power supply (Q7BULK) tripped off. It reset.

At 7:08 PM, Operations reported problems with the Booster beam. They lowered the Booster intensity and then slowly brought it back up.

At 7:11 PM, Operations reported a problem with BRF18 as well as problems with a number of other RF stations.

A Recycler expert began a Schottky study around 8 PM.

Operations established store 6153 at 8:14 PM with an initial luminosity of 277.91E30.

At 8:33 PM, Operations reported that they were still having problems with the Booster beam. Operators tuned.

At 9:40 PM, Operations had to lower NuMI’s intensity due to Booster beam problems during a stash. The stash ended and Operations had the intensities back to normal by 10:25 PM.

Operations reported at 11:55 PM that the Recycler had stashed three times during the evening shift.

Wednesday May21

The midnight shift began with Operations monitoring store 6153 (152.7E30) and the stash (134.2E10), with Pbar stacking (38.3E10), and with NuMI and BNB taking beam.

At 1:28 AM, the MI beam permit tripped off due to bad beam from the Booster. Operators reduced the Booster beam intensity, reset everything, and then brought the Booster intensity back up to normal.

At 1:34 AM, a Booster quadrupole power supply (B:QL3) alarmed on a tracking error. The power supply was not following in reference voltage. Operators investigated.

At 1:52 AM, another Booster power supply (B:LS110) alarmed on a tracking error. Operators reported that they could find nothing wrong with either power supply. Operations contacted a Booster expert who instructed operators to lower QL3’s reference.

At 5:06 AM, KRF6 tripped off. It reset.

At 5:19 AM, a Booster vacuum pump (IPRF23) tripped off and caused BRF13 & 14 to trip. Everything reset.

At 5:46 AM, KRF4 tripped off. It reset.

At 6:16 AM, Operations reported that the MI beam was aborting due to Booster extraction problems. Operators reduced the Booster intensity and the raised it back to normal.

Operations established beam to MTest at 6:22 AM.

At 6:32 AM, KRF6 tripped off. It reset.

At 6:42 AM, KRF4 tripped off. It reset.

Operations reported at 8:01 AM that the Recycler had stashed five times during the midnight shift.

The Plans for Wednesday

The plans for today are to stack, stash, and store. The Run Coordinator will allow several machine studies. Thursday, 5/22/08, will be a shutdown maintenance day for everywhere except the TeV and the Pbar rings. Beam will go down at 5 AM on Thursday with access to most areas starting around 7-8 AM. The Proton Source will resume sending beam around 2 to 3 PM. Here is a short list of jobs: MI RF work, NuMI LCW leak investigation and Far Detector work, Proton Source RF work, and a Pbar target replacement, which is the longest job and will not end until 8 or 9 PM.

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