Accelerator Update - June 16-June 18
The integrated luminosity for last week was 5549.7 nb-1.
At 3 PM, Operations established store 2691 with an initial luminosity of 26.5E30. Pbar resumed stacking.
Equipment rack temperatures alarmed for a Pbar service building, AP-50. Operators installed some temporary fans at 6 PM.
Operators interlocked Switchyard enclosures F1, F2, and F3 at 7 PM, and then at 10:30 PM interlocked the external beamline enclosures M01, M02, M04, and M05. M03 had a problem that will be resolved by the safety system technicians in the morning.
Tuesday June 17
Operations saw several Linac quadrupole power supply trips. Operators had the problem fixed by 1:30 AM.
Operators turned down MiniBooNE at 1 AM and then began tuning on the Booster beam.
Operations terminated store 2692 at 6 AM and put the TeV into shot setup forty minutes later.
Two Booster RF stations (BRF12 & 14) tripped off at 7:34 AM. They both reset okay. Another station (BRF17) tripped of fifteen minutes later. It also reset okay.
Pbar suffered a separator spark at 8:30 AM.
At 8:36 AM, Operations established store 2694 with an initial luminosity of 29.98E30.
Operators interlocked external beamline enclosure M03.
The Linac access ended around 1 PM and the Booster access ended around 4 PM. MI was ready for beam by 5 PM.
The 400 MeV Debuncher, located in Linac but used by Booster, began causing problems at 5:05 PM due to high temperature. Experts investigated. There may have been a flow restriction that cleared itself. The LCW pump was also acting odd.
Operations had sent beam to the Recycler, Pbar, MI, and MiniBooNE by 5:49 PM.
Linac experts had the 400 MeV Debuncher working by 6:32 PM.
Operators were still tuning Booster at 10:30 PM. The problems were due to fluctuating RF cavity temperatures.
Wednesday June 18
The Tevatron Electron Lens (TEL) tripped off around 2 AM. Fortunately, Operations had warned the Collider Detector Facility and D-zero experiments that end-of-store studies were about to begin so the experiments had their high voltages off. A TEL expert had the device operating by 2:20 AM. The end-of-store studies then began.
Operations terminated store 2694 at 7:30 AM.
Operations put the TeV through a dry squeeze at 7:53 AM.
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|last modified 6/20/2003 email Fermilab|