Accelerator Update for January 16, 2008 - January 18, 2008

Wednesday January 16

The day shift began with Operations monitoring the Tevatron (TeV) store 5850 (158.53E30), with the Recycler stash empty, with the Antiproton Source stacking, with the Main Injector (MI), Linac, and Booster operating normally, with the Collider Detector at Fermilab (CDF) and D-Zero (D0) experiments using the colliding beams, and with the NuMI and SciBooNE / MiniBooNE (BNB) experiments taking beam.

At 8:25 AM, a Booster RF station (BRF14) tripped off. It reset.

At 9:10 AM, Operations reported that the Booster West Anode Power Supply (WAPS) had tripped off several times. Experts investigated and discovered a switch box that wasn’t working. BRF11, which had been bypassed, was causing WAPS to trip.

At 11:37 AM, LRF2 tripped off. It reset, but then a Linac Klystron RF station (KRF4) tripped off. It reset.

Operations reported at 12:51 PM that the LRF4 gradient regulation had been acting erratically ever since its problem with bad VME code from last night. Experts were working on the station.

At 1:44 PM, the NuMI beam permit tripped off for the first of eight times in about 2.5 hours. It reset.

At 1:50 PM, MIRF18 tripped off for the first of three times in 14 minutes. An expert investigated after the last trip.

At 2:03 PM, BRF10 tripped off. It reset.

At 2:08 PM, MIRF8 & 18 tripped off. An expert investigated.

Operations turned off the Booster beam at 2:53 PM so that an RF expert could bring BRF11 back online. Booster resumed sending beam at 3:16 PM.

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

At 4:20 PM, Operations reported that MIRF18 had tripped off four times in a few minutes. It reset.

At 7:13 PM, BRF10 tripped off for the first of three times in 18 minutes. It reset.

At 8:49 PM, KRF7 tripped off for the first of two times in about 30 minutes. It reset.

At 9:01 PM, KRF4 tripped off. It reset.

Operations reported at 11:54 PM that the Recycler had stashed five times during the evening shift.

Thursday January 17

The midnight shift began with Operations monitoring store 5850 (48.44E30) and the stash (381.9E10), with Pbar stacking (31.6E10), and with NuMI and BNB taking beam.

At 1:46 AM, KRF3 tripped off. It reset.

At 5:30 AM, MIRF18 tripped off. It reset.

Operations turned off the beam for NuMI at 6:02 AM in preparation for an access.

Operations terminated store 5850 at 6:32 AM.

Operations prepared CDF and D0 for a collision hall access at 6:49 AM.

Operations reported at 7:57 AM that the Recycler had stashed once during the midnight shift.

At 8:04 AM, LRF4 tripped off. It reset.

D0 and CDF came out of access around 8:24 AM.

Operations put the TeV through a dry squeeze at 8:59 AM.

Operations put the TeV into shot setup at 9:29 AM.

The Neutron Therapy Facility (NTF) reported at 10:16 AM that they had completed treatment on their last patient for the day.

At 10:29 AM, the TeV aborted due to bad beam positions at TeV sector B1. This occurred with un coalesced protons during tune-up. Coincidentally, a TeV corrector magnet power supply (VC43) alarmed with a bad fuse fault. Experts investigated and replaced its regulator.

Operations established store 5852 at 12:42 PM with an initial luminosity of 275.4E30.

Operations resumed sending beam to NuMI at 12:43 PM.

At 12:45 PM, Operations reported that MI was continually tripping off due to bad beam positions. Experts investigated.

At 12:54 PM, LRF2 tripped off. It reset.

MI experts had their tuning problem resolved by 1 PM.

At 1:22 PM, KRF4 tripped off for the first of three times in about an hour.

Pbar experts began a study period at 2:40 PM.

At 3:27 PM, LRF2 and KRF4 tripped off. Linac experts investigated.

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

Linac resumed sending beam at 4:19 PM.

Pbar experts completed their study at 6:35 PM. Pbar resumed stacking.

At 6:36 PM, the Booster WAPS tripped off for the first of many times in about 45 minutes. It reset.

At 8:36 PM, BRF3 tripped off. It reset.

At 9:06 PM, Operations reported a MI quadrupole power supply (M:Q105) was tripping off after every reset. An expert investigated.

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

Friday January 18

The midnight shift began with Operations monitoring store 5852 (85.99E30) and the stash (216.8E10), with Pbar stacking (39.7E10), and with NuMI and BNB taking beam.

Around 3:22 AM, KRF4 tripped off. It reset.

At 3:33 AM, KRF2 tripped off for the first of two times in three minutes. It reset.

At 5:30 AM, LRF2 tripped off. It reset.

At 7:30 AM, Operations reported that the NuMI and Pbar beam permits had dropped multiple times due to a “No Beam in NuMI Kicker Gap” indication. Operators investigated.

At 7:33 AM, Operations reported that the Pbar stack was lost due to a power supply (A:IB) tripping off on a ground fault indication. Operators contacted an expert.

Operations loaded a NuMI only timeline at 7:51 AM.

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

The Plans for Friday and the Weekend

The plans for today and the weekend are to stack, stash, and store. The Run Coordinator will allow TeV and MI experts to conduct studies today.

Accelerator Update Archive

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