Shift summary for OWL, 4-July-1999

Alexander Ledovskoy (ledovsko@fnpxsr)
Sun, 4 Jul 1999 07:05:10 -0500

Shift Summary for OWL shift, 4-JULY-99

On Shift: Ruth Pordes, Sasha Ledovskoy

Hours of beam available at all intensities: 3.42h
Hours of beam available at nominal intensity: 3.28h
Hours of E832 data (special runs not included): 3.25h
Hours of special runs (laser scans, muon runs...): 0.5h

Accounting of lost time:
kfrend, stop/start run

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Runs ended this shift:

Run 13805 - 5.49M events - BEAM_832
Run 13806 - 0.05M events - BEAM_832 (no beam)
Run 13811 LASER_SCAN(aborted)

Tapes brought to FCC this shift: none

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Accesses during shift: none

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Overview of shift: E832 datataking

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Description of Shift:

run spill time comment
------------------------------------------------------------------------
13805 92 0:00 New shift crew takes over

135 0:55 ktevana errors (crate 53 is missing FFFF word)
KFREND fixes the problem - back to normal.

1:00 On-line histograms are checked. There is no new
problems.

1:00 No beam: SY energy conservation in effect.
1:11 TeV abort problems, est. for beam 20 min.
1:29 Beam returns in 5E12

2:25 DYC53 BUSY. KFREND does not help. Cycle cr53 power.
Get triggers going but spill number is missing.
Stop the run

13806 2:30 Start BEAM_832 run, but
No Beam: vacuum problems in TeV, no estimates

4:30 Still no beam and no estimates. Stop this run

13811 5:05 Desided to do LASER_SCAN. Reconfigure tape drive
destinations for LASER_SCAN (ktev2, drv3->drv5)
Start Long Laser scan.

5:35 Beam is back. Abort laser scan on second pass.

13812 5:40 BEAM_832

5:55 HCC is inefficient error - reload Etot-back to normal


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