Fermi National Laboratory

Accelerator Update for July 11, 2005 - July 13, 2005

Monday July 11
The day shift began with the Antiproton Source (Pbar) down for repairs to A:IB, Tevatron (TeV) down for Cryo work at D1, MiniBooNE, NuMI, and Meson MCenter taking beam. The Recycler Ring (RR) stash is 42.0 E10.

At 10:54 AM the Main Injector (MI) began some studies.

Tev turned back on at 1:13 PM after the D1 Cryo work was completed.

A:IB repair was completed by 2:05 PM.

Pbar stacking resumed at 5:25 PM after a card was changed for power supply A:LQ. Currently Pbar stacking is being slowed by problems with power supply D:Q701 and interlock problems with the AP0 lens power supply D:LNV.

After replacing a firing circuit module for D:Q701 and a safety system interface chassis for D:LNV stacking resumed at 10:15 PM.

Tuesday July 12
The midnight shift began with Tev studies, the Recycler stash at 35.3 E10, with Pbar stacking, and with MiniBooNE, NuMI, and MCenter taking beam.

At 10:14 AM we lost Booster beam due to high losses, the losses were due to corrupt ramps for B:QL, normal beam returned at 10:40 AM.

Shot setup to the Tev began at 11:50 AM,

Operations established store 4269 at 1:51 PM with an initial luminosity of 75.1 E30. Pbar resumed stacking, beam to MCenter.

Problems with MECAR resulted in it being power cycled at 5:00 PM.

Operations put the Recycler into shot setup at 9:15 PM to stash antiprotons.

We lost 20% of the Tev luminosity due to problems with the longitudinal dampers, the dampers have been turned off, and will be looked at after the current store is terminated.

Wednesday July 13
The midnight shift began with Operations monitoring store 4269 and a Recycler stash, with Pbar stacking, and with CDF, D0, MiniBooNE, NuMI, and MCenter taking beam.

The Plan for Wednesday
Terminate the store, investigate the longitudinal damper problem, establish another store, return to stacking.

Accelerator Update Archive

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last modified 7/13/2005   email Fermilab