Accelerator Update - July 21-July 23
The integrated luminosity for last week was 5106.9 nb-1.
At 9:32 AM, cryo experts installed new software for controlling cryo valves that should stop the occasional valve excursions that have caused quenches in the past. If this test code works on the sector A cryo system, it will be installed everywhere.
Both D-zero (D0) and the Collider Detector Facility (CDF) experiments had accessed their collision hall around 9:42 AM. Both experiments were out of access by 11:30 AM.
Cryo experts began conducting wet engine repairs around the TeV ring at 10:23 AM.
At 9:13 PM, the Pbar stack went away. Operators investigated and discovered an interlock problem. Operators called in a safety system technician who replaced a failed summation switch at 11:30 PM.
Tuesday July 22
Cryo techs at CHL noticed a low speed alarm occasionally showing on the sector B3 wet engine. This will have to be repaired later.
Operations conducted a quick end-of-store study and then terminated store 2810 at 2:09 PM.
CDF and D0 accessed their collision halls at 2:26 PM. Both experiments came out of access about thirty minutes later.
At 3:03 PM, a Main Injector RF station (MIRF9) started tripping off. Operations asked an expert to investigate.
Operations put the TeV through a dry squeeze at 3:40 PM.
Booster RF stations 5 and 6 tripped off due to a high vacuum alarm. Everything reset okay.
Operations established store 2813 at 7:40 PM with an initial luminosity of 31.64E30. Pbar resumed stacking.
Wednesday July 23
A Linac RF station (KRF4) tripped off at 7:27 AM. Operators responded and beat up an offending LCW flow switch. The station was off for about ten minutes.
Switchyard experts were preparing to conduct beam studies at 8 AM.
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|last modified 7/23/2003 email Fermilab|