Shift summary DAY 12/13/99

Richard Ford (
Mon, 13 Dec 1999 15:42:41 -0600 (CST)

Shift Summary for day shift, 12/13/99

On Shift: E. Turner, R. Ford

Hours of beam available at all intensities: 7.8
Hours of beam available at nominal intensity: 7.8
Hours of E799 data (special runs not included): 7.8
Hours of special runs (laser scans, muon runs...): 0.0

Accounting of lost time:

TeV PS water leak, NS1 LCW trip, spurious aborts

Runs ended this shift: 15211

Tapes brought to FCC this shift:

Accesses during shift:

Overview of shift:
Beam intensity was mostly optimal. Some beam quality problems manifested
by out of limit scaler rates. Overall decent datataking until end of
shift with TeV PS water leak.

Description of Shift:

run spill time comment
15211 07:30 Still getting SCALER/SEM errors; both high and
high and low limit. Called MCR to work on
spill quality.

07:56 HCC ineff. erros on channels 366,1767

08:00 Scaler errors much less frequent.

235-239 08:55 No Beam

09:00 Wire 84 of plane 9 has bad T0 offset

09:30 ET zeros Reg HV

10:25 PSH adjusted variable filter wheel for laser system
Laser light level increased by more than x2.

11:00 BobT and RickF look at rates and timing on new ACC4
counter. Results in log book.

11:55 Hogan wants be paged when beam is down 15min or more
so he can start a new run.

450 13:45 Scaler alarms go wild; ET notices epicure red light
Further investigation shows NM1U and NM1H tripped off.
Called MCR. They were unaware so we requested they
turn off beam until fixed.

459 13:52 Beam returns; LCW trip.

14:05 Spill structure gets bad. MCR informed.

515 15:07 Ch.13: Investigating TeV PS water leak.
Stop run 15211. Hogan calls within seconds of beam
disappearing as if he somehow knew. He is enroute.
Various special interests are organizing for accesses.

Follow up Notes on Previous Shift

Items to Follow up on Next Shift
CsI 2081 has a large gain drift(~5%), keep an eye on it.
HCC channels 2803 and 1767 were both highly inefficient
during the run, watch to make sure that they aren't getting worse,
experts have been notified.