Fermi National Laboratory

Accelerator Update for July 5, 2006 - July 6, 2006


Wednesday July 5

The day shift began with Operations monitoring store 4813 and a Recycler stash, with the Collider Detector at Fermilab (CDF) and D-Zero (D0) using the colliding beam store, with the Antiproton Source (Pbar) stacking, with the Linac, Booster, Main Injector (MI), and Recycler operating normally, with NuMI off due to a horn cooling problem, and with MiniBooNE taking beam.

Operations established beam to the Meson MTest experiment at 10:07 AM.

Operations turned off all beam at 11:48 AM and began preparing the Preaccelerator , Linac, Booster, and MI for accesses.

The access into the H- Source ended at 1:21 PM.

Linac came out of access at 2:27 PM.

Booster came out of access at 4:56 PM.

MiniBooNE began taking beam at 5:35 PM.

Pbar began stacking at 5:39 PM.

At 5:43 PM, Operations reported that two cold compressors had tripped off due to over heating for the TeV sector A0 area. Cryo system technicians turned on a compressor at Switchyard (SY) and two other compressors (at D0 and E0) to compensate. The Duty Mechanic reported that this was a flow issue due to a clogged pond strainer.

At 6:34 PM, Operations halted beam for fifteen minutes so that techs could investigate a problem with the Booster ORBUMP power supply.

Pbar resumed stacking at 6:49 PM.

At 7:15 PM, Operations reported that the SY work wasn’t going well. Operations decided to prepare the Recycler to stash antiprotons.

The stash ended and Pbar resumed at 8:13 PM.

A FESS expert reported at 8:37 PM that they had added a fire hose at TeV sector A0 to improve water pressure. However, while doing this, the water pressure returned to normal; the clog released on its own.

Thursday July 6

The midnight shift began with Operations monitoring store 4813 and the stash, with Pbar stacking, and with MiniBooNE taking beam.

The Recycler began preparing to stash at 12:31 AM. The stash ended. Pbar resumed stacking at 1:13 AM.

At 1:17 AM, all of the quadrupole power supplies associated with the first Linac RF station (LRF1) alarmed. Operators replaced a Timing Pulse Repeater module.

At 4:32 AM, a Linac RF station (KRF6) tripped off on LCW flow. Operators were able to persuade the flow meter to resume normal operations.

The Recycler began preparing to stash at 5:17 AM. The stash ended. Pbar resumed stacking at 5:47 AM.

The Plans for Thursday

The plans for today are to terminate store 4813 at 1 PM and then allow TeV experts to conduct a two-hour study; a store will follow the study.

Accelerator Update Archive

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last modified 07/06/2006    email Fermilab