Accelerator Update - May 16-May 19
Last week Fermilab set a new integrated luminosity record with a level of 9159 nb-1.
At 10:12 AM, Operations terminated store 2549, and then at 10:53 AM put the TeV into shot setup.
At 1:45 PM, Operations established store 2551 with an initial luminosity of 43.08E30. Pbar resumed stacking.
Pbar sustained a stack-rate of 13.35 mA for one hour at 2:52 PM. This set a new stacking record.
Saturday May 17
Operations terminated store at 2551 at 8:05 AM.
At 8:22 AM, Operation had both the Collider Detector Facility (CDF) and D-zero (D0) collision halls ready for access.
At 10:31 AM, while an expert was investigating the problem with BRF13, it started working. Operations will keep an eye on the station.
Power supply techs put a diagnostics on T:HE17, and then Operations put the TeV through another dry squeeze at 12:56 PM. Operations then put the TeV into shot setup at 1:02 PM.
At 3 PM, Operations established store 2555 with an initial luminosity of 44.895E30. This set a new luminosity record.
Pbar set another new stacking-rate record with a rate of 13.51mA for one hour between 3:15 and 4:15 PM.
Sunday May 18
At 7:38 AM, a MI expert began conducting coalescing studies.
Operations terminated store 2555 and, at 8:10 AM, operators prepared the D0 collision hall for an access. The D0 experimenters were out of access by 9:20 AM.
Operations put the TeV through a dry squeeze at 9:26 AM, and then into shot setup at 10:06 AM.
At 12:36 PM, the TeV suffered an abort just after the last of the antiprotons were loaded due to a RF station (TRF3) trip; a power supply faulted. Pbar resumed stacking.
An expert began his investigation of the TRF3 fault. He didn't believe that TRF3 was the cause of the abort.
At 3:26 PM, Operations put the TeV through a dry squeeze.
A TeV expert arrived at 4:28 PM to begin orbit studies.
At 8:50 PM, the TeV suffered a sector BA quench while attempting to terminate the study beam.
A Linac RF station (LRF3) tripped off at 10:49 PM and then again at 11 PM. At 11:13 PM, LRF3 tripped off and would not reset. Operators called in a Linac tech.
Monday May 19
The Linac tech had LRF3 back in operation by 1:35 AM.
Operations put the TeV into shot setup at 2:30 AM. Store 2562 was established at 3:56 AM. Its initial luminosity was 3o.07E30. Pbar resumed stacking.
At 4:11 AM, the Linac tech reported that LRF3 was still having problems. He said he'd come back during the morning and change out a driver tube.
LRF3 tripped off at 5:16 AM. Operators turned it and other stations off in preparation for the scheduled access day. They also began making MI ready for the Recycler access.
Comments and Suggestions
|last modified 5/19/2003 email Fermilab|