Accelerator Update - July 25-July 28

Friday July 25
The day shift started with store #2817 colliding, AntiProton Source (Pbar) stacking, and beam to Miniboone.

Stacking and beam to Miniboone were intermittent between 8:30 AM and 11:40 AM due to a problem with a Main Injector (MI) trim power supply. The supply was eventually replaced.

Switchyard studies began at 12:17 PM.

Recycler (RR) studies began at 2:23 PM.

Slipstacking studies began at 2:41 PM.

Stacking, miniboone and studies were halted between 4:24 PM and 6:47 PM due to a Booster power supply tripping off. Insufficient cooling to the supply caused the trip.

Store #2817 was terminated at 7:15 PM

After a short D0 access and problems with a Tevatron (Tev) crate power supply the Tev went into ~ 1 hour of studies.

Switchyard studies ended at 10:50 PM.

Saturday July 26
The midnight shift started with the Tev in shot setup

Store #2821 was colliding by 1:55 AM with an initial luminosity of 40.44e30. We then returned to stacking.

They monitored the store and stacked for the rest of the day.

Switchyard 120 came on for studies between 4:20 PM and 7:47 PM.

Store #2821 was terminated at 11:30 PM.

Sunday July 27
Shot setup for the Tev began at 1:10 AM, with store #2824 colliding by 3:04 AM with an initial average luminosity of 45.34e30. This is a new record.

At 3:07 AM Pbar returned to stacking.

The day shift started with store #2824 colliding, AntiProton Source (Pbar) stacking, and beam to Miniboone.

Lost store #2824 at 5:38 PM due to a quench at E2. The quench appeared to be caused by vacuum and/or a leaking kautzky valve. It was decided to wait until after the next store to look at these problems.

The Tev quench recovery was completed by 11:30 PM.

Monday July 28
Store #2826 was colliding by 2:30 AM with an initial luminosity of 37.2e30. We then returned to stacking.

Today's Plan
Continue stacking and storing, and sending beam to MiniBoone.

Accelerator Update Archive

More Information
For Tevatron luminosity charts and the current status of Fermilab's accelerators and detectors (live!), please go to Fermilab Now

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