Fermi National Laboratory


Accelerator Update for May 20, 2005 - May 23, 2005

Friday May 20
The day shift began with the Antiproton Source (Pbar) stack at 76.9 E10, Tevatron (TeV) studies, and with Pbar stacking, and with MiniBooNE, NuMI, and the Meson MCenter taking beam.

Shot setup begins at 12:08 PM.

Operations established store 4162 at 2:17 PM with an initial luminosity of 64.63E30. Pbar resumed stacking, beam to MCenter, and NuMI began low intensity target scans.

Operations put the Recycler into shot setup at 5:11 PM to stash antiprotons.

The Recycler stash ended at 6:26 PM.

Saturday May 21
The midnight shift began with Operations monitoring store 4162, with Pbar stacking, and with MiniBooNE, NuMI, and MCenter taking beam.

The Tev quenched at 6:16 AM. The quench was caused by a voltage drop on the C49 separator.

D0 went in for a 1 hour access at 7:16 AM.

Shot setup began at 10:43 AM.

Operations established store 4164 at 1:23 PM with an initial luminosity of 101.32E30. Pbar resumed stacking, beam to MCenter, and NuMI.

Disabled Mcenter at 8:14 PM for shots to the Recycler ring.

Pbar stacking and beam to Mcenter resumed at 10:24 PM.

Sunday May 22
The midnight shift began with Operations monitoring store 4164 and the stash, with Pbar stacking, and with MiniBooNE , NuMI, and MCenter taking beam.

The interlocks for MC7 dropped at 3:14 AM, Operations re-secured and beam returned to MCenter at 3:51 AM.

Tev quench at 8:49 AM, recovery and investigation began.

The cause of the quench was traced to C:B0Q3 and the DCCT chassis was replaced for the power supply by 2:31 PM.

Shot setup was delayed by controls problems with the Tev BPMs and began at 11:28 PM.

Monday May 23
The midnight shift began with Operations in shot setup to the Tev.

At 12:34 AM, the store was lost at low Beta due to a radiation trip caused by a tune shift.

The Plan for Wednesday
The plan for today is to stack to 100ma and then go into shot setup.


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

Comments and Suggestions
What do you think about the Accelerator Updates? Please send comments and suggestions to: accelupdates@fnal.gov.



last modified 5/23/2005   email Fermilab