Accelerator Update for February 1, 2006 - February 3, 2006
Wednesday February 1
The day shift began with Operations monitoring the Antiproton Source (Pbar) stack and the Recycler stash, with the Tevatron (TeV) in shot setup, with Pbar experts investigating problems with the Lithium Lens, with Switchyard (SY) off due to shot setup, and with NuMI and MiniBooNE taking beam.
At 8:35 AM, experts accessed the Pbar AP0 target vault.
Operations resumed sending beam to the Meson MTest and MCenter experiments at 11:09 AM.
Pbar experts reported that the Lithium Lens repairs were completed by 5:02 PM.
NUMI resumed taking beam at 5:28 PM.
Pbar resumed stacking at 5:54 PM.
BRF5 tripped off at 7:08 PM. When it tripped, the station took down all the other Booster RF stations. Operators had Booster running within a few minutes, but called in RF experts to investigate anyway.
The Recycler began stashing antiprotons at 7:51 PM. The stash ended and Pbar resumed stacking at 8:45 PM.
At 9:51 PM, Operations reported that stacking had stopped. An expert reported that he thought the problem was due to a VCB. Experts investigated.
At 11:36 PM, power supply experts had to switch out a feeder (MOS89) that halted all beam except for beam to MiniBooNE.
Thursday February 2
The midnight shift began with Operations monitoring the stack and stash, and with the F17B3 power supply work continuing. MiniBooNE was off at the beginning of the shift.
Operations prepared the D-Zero (D0) experiment at 12:01 AM for a collision hall access.
MiniBooNE resumed taking beam at 12:26 AM.
D0 came out of access at 2:03 AM.
Operations reported that power supply experts completed repairs on F17B3 at 4:50 AM.
Operations put the TeV into shot setup at 4:51 AM.
NuMI resumed taking beam at 5:26 AM.
At 7:34 AM, Pbar resumed stacking due to problems with the TeV shot. Investigations continue.
Operations put the TeV back into shot setup at 10:34 AM.
The NUMI experiment reported at 12:04 PM that they had finished their low intensity run. NUMI beam was turned off for an access.
Operations established store 4621 at 12:35 PM with an initial luminosity of 67.95E30.
The Recycler stashed antiprotons at 1:50 PM. The stash ended and Pbar began stacking at 2:59 PM. Beam to SY resumed two minutes later.
NUMI resumed taking beam at 3:26 PM.
At 4:48 PM, Operations reported problems with the Booster RF system. Experts investigated.
Operations turned off BRF4 and noted at 6:33 PM that the Booster RF problems cleared up.
The Recycler stashed antiprotons at 7:52 PM. The stash ended and Pbar began stacking at 8:47 PM.
At 10:56 PM, the Tevatron Electron Lens (TEL) tripped off. Operators investigated but found no bad status. An expert advised Operations to just keep reseting the device.
Friday February 3
The midnight shift began with Operations monitoring store 4621 and the stash, with Pbar stacking, and with MTest, MCenter, NuMI, and MiniBooNE taking beam.
The Recycler stashed antiprotons at 1:02 AM. The stash ended and Pbar resumed stacking at 1:56 AM. MTest and MCenter resumed taking beam.
The Recycler began preparing to stash antiprotons at 5:38 AM. The stash ended and Pbar resumed stacking around 6:30 AM. MTest and MCenter resumed taking beam.
Operations terminated store 4621 at 8:15 AM.
The Plans for Friday and the WeekendThe plans are to establish a store later this morning after D0 completes their access. Pbar experts will be allowed to access their tunnel after the shot. The weekend will consist of stacking, stashing, and storing.
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|last modified 02/03/2006 email Fermilab|