Fermi National Laboratory

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 reported at 3:09 PM that the SwitchYard 120 (SY) and the Meson primary beamlines have been given permission to take beam.

Operators began a search and secure of the Collider Detector at Fermilab (CDF) at 3:09 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 established a Main Injector (MI) ramp at 8 PM.

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 midnight shift began with Pbar stacking (13.5mA), with the Recycler and TeV experts conducting studies, and with SciBooNE / MiniBooNE taking beam.

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.

Operations prepared the Recycler to stash antiprotons at 2:25 AM.

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.

Accelerator Update Archive

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last modified 10/24/2007    email Fermilab