Accelerator Update - July 11-July 14
Operations terminated store 2774 at 1:04 PM. Operators prepared the Collider Detector Facility (CDF) and D-zero (D0) experimental collision halls for an access. Both experiments were out of access by 2:30 PM.
Operations resumed sending beam to MiniBooNE at 5:33 PM.
Operations put the TeV into shot setup at 6:25 PM.
The Booster suffered a vacuum burst at 7:47 PM. Everything was reset within five minutes.
At 8:41 PM, Operations established store 2780 with an initial luminosity of 37.90E30. Pbar resumed stacking.
A MI expert began conducting damper studies at 9 PM.
Saturday July 12
The MI damper studies were finished at 1 AM.
At 1:52 AM, operators discovered a Tevatron (TeV) RF station (TRF5) not working. Operators called an expert who suggested that the station's water heater be turned off.
The I- Source started sparking a little at 3:40 AM.
Two Switchyard experts tried to conduct studies at 9:53 AM, but many problems delayed them.
The I- Source tripped off at 10:38 AM. It reset okay.
Stacking stopped at 11:49 AM due to a kicker problem (A:IKIK). Operators called in an expert who, at 1 PM, found a bad connector.
A MI expert began conducting studies at 12:53 PM. She ended her studies four hours later.
A Booster expert arrived at 2 PM to investigate a problem with a kicker (MKS04). It took about two hours to complete repairs.
A Linac RF station tripped off at 3:14 PM. Operators had the station back on by 3:41 PM, but it tripped off again just a few minutes later. Operations rebooted several systems.
Operations put the TeV through a dry squeeze at 5:09 PM.
A TeV RF expert arrived to work on TRF5 at 5:42 PM. He replaced a power supply, among other things, and had the station working by 6:30 PM.
Operations adjusted the Booster coalescing at 6 PM. Operators noticed another problem and contacted a Booster expert to come in. He said the problem was with a kicker (MKS03) and that it wouldn't last long. The repair, which required a tunnel access, was scheduled for 8:30 AM, Sunday morning.
Operations put the TeV into shot setup at 8:36 PM. At 11 PM, while performing a reverse proton tune up, problems occurred. Operation consulted with experts for advice.
A Linac RF station (LRF4) tripped off at 11:22 PM for the first of three times within fifteen minutes.
Sunday July 13
A Linac RF station tripped off at 12:09 AM. It reset okay.
Operation halted shot setup at 1 AM because the TeV problems were not understood.
A Booster power supply (ORBMP) tripped off at 1:46 AM due to an interlock fault. It tripped off three more times within the next forty-five minutes. Operators adjusted a limit on a LCW flow switch.
Operations resumed shot setup at 2:27 AM.
Operations established store 2783 at 3:40 AM. Its initial luminosity was 32.62E30. Pbar resumed stacking.
Operators rebooted the Switchyard front end at 7:22 AM to restore a link, but it didn't work. Operators contacted a controls expert who swapped out some equipment, but there were still problems. Eventually, techs found a bad crate power supply and replaced it at 10:52 AM.
Operations turned off the Booster at 7:32 AM in preparation for the tunnel access and repair of kicker MKS03. This halted all stacking and MiniBooNE beam. The repairs began at 8:44 AM. At 9:18 AM, an expert stated that the kicker was beyond repair and had to be replaced.
The Booster work was completed by 11 AM. Stacking resumed at 11:13 AM, and beam to MiniBooNE at 11:27 AM.
The Booster suffered a vacuum burst at 8:06 PM. It reset okay.
At 9:49 PM, the Booster ORBMP power supply tripped off again on an interlock fault. It tripped off two more times within the next thirty minutes. At 10:33 PM, operators adjusted two LCW flow switches.
The TeV store 2783 aborted at 10:16 PM. A number of TeV RF stations tripped off. TRF4 sparked and may have caused the other station to also spark. There was no quench. An expert came in and began investigating the TeV damper system.
Pbar resumed stacking at 10:33 PM.
Booster RF stations 13 and 14 tripped off at 11:45 PM on a high vacuum fault. The fault would not clear.
Monday July 14
MiniBooNE beam returned at 12:25 AM.
At 12:30 AM, a TeV RF expert replaced a bad power supply.
Operations put the TeV through a squeeze with beam at 1:35 AM. At 2:13 AM, Operations put the TeV into shot setup.
Operations established store 2786 at 3:32 AM with an initial luminosity of 30.92E30. Pbar resumed stacking.
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|last modified 7/15/2003 email Fermilab|