Accelerator Update for October 23, 2007 - October 24, 2007
Tuesday October 23
The day shift began with the accelerator complex in access.
Linac experts established beam to the Linac absorber at 11:34 AM. Linac Work: they fixed the Debuncher, connected an NMR probe to the spectrometer magnet, replaced failed counters on a Klystron RF station (KRF3), and checked the brushes on the I- Source Haefely.
The Tevatron (TeV) came out of access at 1:49 PM.
The Antiproton Source (Pbar) came out of access at 2:41 PM.
Operations put current on the TeV bus at 4 PM.
Operators completed a search and secure of D-Zero (D0) at 5:39 PM. The D0 experiment successfully completed their preamp repair.
Operations put the TeV through a dry squeeze at 8:12 PM.
Operations established beam to the MI absorber at 8:29 PM.
TeV experts began a study period around 8:47 PM.
Pbar resumed stacking around 11 PM.
Wednesday October 24
The Recycler expert studies ended around midnight. However, operators completed a requested Recycler study during the shift.
At 1:10 AM, the MI power supply interlock loop tripped off. It reset.
Around 6:14 AM, the MIPS interlock loop tripped off for the first of two times. Operators reset it.
At 6:38 AM, a Pbar power supply (M:V105) tripped off on a magnet over temperature indication. Operators contacted an expert and per his instructions reset the supply.
Operations reported that the Pbar stack rate had been poor all shift. At 7:21 AM, Operators turned off the Pbar momentum cooling system; the stack rate improved.
At 7:42 AM, the Pbar beam permit dropped on a “Target Station Permit – Dump.” An expert investigated, but wasn’t able to reset the trip. Another expert investigated.
Operations put Pbar into standby mode at 7:53 AM for the investigation.
The Plans for Wednesday
The current plan for today is for the accelerators to continue with startup commissioning.
Comments and Suggestions
|last modified 10/24/2007 email Fermilab|