Fermi National Laboratory

Accelerator Update for October 22, 2007 - October 23, 2007


Monday October 22

The day shift began with the Antiproton Source (Pbar) stacking (100E10), with Operations monitoring a Recycler stash (235.7E10), with the Main Injector (MI), Recycler, Pbar, and Tevatron (TeV) conducting studies, with the SciBooNE / MiniBooNE experiments taking beam, and with the Neutron Therapy Facility (NTF) treating patients.

At 8:27 AM, Operations reported that a TeV RF station (TRF7) was failing.

Operations reported at 9:46 AM that TeV experts brought the TeV down to 150 GeV and emptied it of all protons.

Operations reported at 9:51 AM that RF experts began repairs on TRF7.

At 10:06 AM, Operations reported that a MI RF station (MIRF01) had tripped. Experts investigated and had it back on 20 minutes later.

Operations halted the stacking at 10:06 AM and Pbar experts began reverse protons studies.

Operations reported at 10:07 AM that they had stashed the Recycler with 2 transfers of antiprotons.

TeV experts resumed their study at 10:57 AM.

At 11:18 AM, the TeV suffered a quench at TeV sector A1. The cause was a kicker (AAK2) prefire. Experts investigated.

At 12:10 PM, Operations prepared the TeV for an access. Cryo system experts reported that there was a stuck kautzky valve at TeV sector A13.

Operations prepared the Collider Detector at Fermilab (CDF) for access at 12:36 PM.

Operation prepared the Transfer Hall, sector A, for an hour access at 12:40 PM to repair the stuck kautzky valve.

NTF completed treating their last patient for the day at 1:03 PM.

Operations reported at 1:41 PM that the Recycler began transfers of antiprotons to MI.

At 6:37 PM, Operations reported a quench indication while turning things on. No heater firing units had fired. There was no quench. They also found a lead failure at TeV sector C4.

Pbar resumed stacking at 7:02 PM.

Operations put the TeV through a dry squeeze at 7:47 PM.

TeV studies resumed at 8:21 PM.

At 8:29 PM, the TeV suffered a quench at sector E3. An operator reported that beam had been injected on top of beam. TeV experts investigated.

Pbar experts began sending reverse protons to the Accumulator at 9:07 PM.

Operators reported at 11:30 PM that they had searched and secure Meson enclosures M03, 4, and 5.

Operations began tunes ups for transferring antiprotons from the Recycler to the TeV at 11:44 PM.

Tuesday October 23

The midnight shift began with Pbar conducting studies, with Operations monitoring the stash, with TeV experts preparing to accept antiprotons, and with Sci/MiniBooNE taking beam.

TeV experts completed a successful reverse proton tune up at 1:08 AM.

Operations reported at 1:42 AM that the first transfer of antiprotons was successfully injected into the TeV. Three more transfers had been made by 1:42 AM. Eventually, Operations established a 0x36 antiproton only store.

Operators charged the TeV abort kickers and aborted the TeV store at 2:44 AM.

A Recycler expert began a proton study at 2:44 AM.

Operations put the TeV through a dry squeeze at 3:51 AM.

Operations turned off beam to Sci/MiniBooNE at 5:03 AM.

Operations began preparing the TeV for access at 5:54 AM.

Operations began preparing Pbar for access at 5:55 AM.

Operations had the CDF and D-Zero (D0) collision halls ready for access by 6:01 AM.

Operations began preparing Booster for access at 6:04 AM.

Operations had MI prepared for access by 6:29 AM.

Operations had Linac prepared for access by 6:50 AM.

The Plans for Wednesday

The current status for today is as follows: Linac, Booster, Main Injector, Tevatron, Antiproton Source, CDF, and D0 are all in access. The D0 detector repairs are driving the shutdown.

Accelerator Update Archive

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last modified 10/23/2007    email Fermilab