Accelerator Update for July 19, 2006 - July 21, 2006
Wednesday July 19
The day shift began with Operations monitoring store 4839 and a Recycler stash, with the Collider Detector at Fermilab (CDF) and D-Zero (D0) using the colliding beam, with the Antiproton Source (Pbar) stacking, with the Linac, Booster, Main Injector (MI), and Recycler operating normally, with the NuMI horn cooling work continuing, and with MiniBooNE taking beam.
A Pbar expert reported at 8:57 AM that he had valved in both cooling pumps at Pbar and the system temperatures were coming down.
At 9:05 AM, Operations received a report of a LCW leak in the lower Linac in the area of the Neutron Therapy Facility (NTF) water skid. A Linac expert investigated and reported that the leak was on the Linac test station. He will investigate further.
Operations established beam to the Meson MTest experiment at 9:16 AM.
A Pbar expert began a target scan at 9:19 AM.
Booster experts began tuning for higher intensities at 10:09 AM.
Operations began preparing the Recycler at 11:19 AM to stash antiprotons.
At 12:17 PM, Operations reported that the Recycler low-level RF went into a strange state. It wasn’t responding to commands. Operations halted the stash and resumed stacking.
MTest resumed taking beam 12:22 PM.
At 12:55 PM, Booster experts began working on a RF station (BRF17). This held off beam for fifteen minutes.
Operations reported at 1:36 PM that the heat exchanger for the Booster LCW system was clogged. Technicians brought the backup heat exchanger online and then began cleaning the main exchanger.
The Recycler began preparing to stash at 3:07 PM.
The stash ended and MTest resumed taking beam at 3:54 PM.
Operations prepared D0 for a collision hall access at 4:10 PM.
TeV RF experts reported at 5:26 PM that they were working on problems with TRF2, 3, and 4.
Operations prepared the CDF collision hall for access at 5:53 PM.
TeV RF experts reported that they were done with their work at 6:05 PM.
D0 came out of access at 6:41 PM.
CDF came out of access at 7:01 PM.
Operations put the TeV through a dry squeeze at 7:43 PM.
The MTest experiment finished using the beam at 8:27 PM.
Operations put the TeV into shot setup at 8:28 PM.
MI and Instrumentation experts began working on the MI BPMs at 8:33 PM.
MI experts began a BPM study at 9:02 PM.
Operations established store 4841 at 11:44 PM with an initial luminosity of 125.1E30.
The Recycler began preparing to stash at 11:45 PM.
Thursday July 20
The midnight shift began with Operations monitoring store 4841, with the Recycler preparing to stash, and with MiniBooNE taking beam.
At 12:10 AM, Operations reported that the stash was on hold due to a sequencer problem. The problem was resolved and the stash ended.
Operations put the TeV through a dry squeeze at 5:53 AM.
At 6:53 AM, Operations reported a flash of light, a clap of thunder, and then the MI power supply loop and MI-40 kickers went down. Everything reset okay.
The Recycler began stashing at 6:58 AM. The stash ended and Pbar resumed stacking at 7:06 AM.
At 7:09 AM, the TeV pond pump (M:C4PNDP) at sector C4 tripped off. Operators could not restart the pump and called the Duty Mechanic. He managed to get the pump back on an hour later.
Operations reported at 8 AM that the Recycler had stashed antiprotons three times during the midnight shift.
Operations put the TeV into a wet squeeze around 8 AM.
At 8:52 AM, Operations reported that the temperature in the TeV sector E2 service building electronics room was 104 degrees F. The Duty Mechanic investigated. Operations put the shot setup on hold.
The Duty Mechanic installed a portable air conditioner at E2 at 9:15 AM.
Operations put the TeV through a dry squeeze at 9:57 AM.
Operations put the TeV back into shot setup at 10:27 AM.
Operations established store 4845 at 1:31 PM with an initial luminosity of 102.68E30.
MTest resumed taking beam at 1:54 PM.
At 2:09 PM, BRF7 tripped off with no status to indicate what was wrong. An operator contacted a RF expert.
The Recycler began preparing to stash at 3:13 PM. The stash ended and Pbar resumed stacking at 4:05 PM. MTest resumed taking beam.
The Recycler began preparing to stash at 8:24 PM. The stash ended and Pbar resumed stacking at 9:04 PM. MTest resumed taking beam.
Friday July 21
The midnight shift began with Operations monitoring store 4845 and the stash, with Pbar stacking, and with MiniBooNE taking beam.
The Recycler began preparing to stash at 1:12 AM. The stash ended and Pbar resumed stacking about 1:45 AM.
The Recycler began preparing to stash at 5:42 AM. The stash ended and Pbar resumed stacking at 6:07 AM.
The Plans for Friday and the Weekend
The plans for today are to terminate the store at 2 PM and then allow CDF and D0 to access their collision halls. The plans for the rest of the day and the weekend are to stack, stash, and store.
Major Sources of Downtime
Downtime: 6 hours, plus a Linac half hour access
Beam on target
Beamline auto orbit correction (a.k.a. Overthruster)
Debuncher cooling kicker repair
Fix stacktail cooling
Transverse emittance growth during momentum mining/extraction
Current criteria for Tevatron shots
Work Done this Week
Work for Next Week
Comments and Suggestions
|last modified 07/28/2006 email Fermilab|