Shift summary - Eve 11/09/99

Julie Whitmore (
Wed, 10 Nov 1999 00:08:14 -0600 (CST)

Shift Summary for Eve shift, 09/Nov/99

On Shift:Ricardo, Julie

Hours of beam available at all intensities: 8.25
Hours of beam available at nominal intensity: 8.25
Hours of E799 data (special runs not included): 7.25
Hours of special runs (laser scans, muon runs...): 0.0

Accounting of lost time: Run aborted due to dirty ktev4 drive and/or
bad tape. Ended run early to update CSQ6 and DCT0
calibration constants.

Runs ended this shift:
Run 14933 - 23.8M events - BEAM_799
Run 14936 - 11.7M events - BEAM_799

Tapes brought to FCC this shift:
(including tapes for online split)


(vaulted by Arun)

Accesses during shift: None.

Overview of shift:
Relatively smooth data taking interrupted by Taku spontaneously aborting
a run. Beam structure is variable (sometimes 2Hz, sometimes smooth).
Updated CSQ6 and DCT0 constants.

Description of Shift:

run spill time comment
14933 15:30 Arrive to find Margaret Votava working on
DOT problem. Flying blind w/o tape usage

15:45 Phone MCR to complain about 2Hz structure.
No obvious improvment made.

16:15 Alcohol bubbler filled by DN.

16:10 Margaret gets DOT working (see logbook XXII,
p.201 for details). DOT struggles to catch
up to run.

16:23 Tapes over 100% full. Taku announces he is
full. We believed the run ended gracefully,
but CsI and DC experts find that calibration
files are missing (DCT0 and CSQ6) for that

14934 16:30 Start run 14934.

16:50 Run aborts. ktev4 tape drive 1 needs
cleaning. Page Sydney. Margaret sees
"hardware error" in log file. Decide to
clean drive and use new tape.

14936 17:35 Decide to overwrite tapes. Run init hangs
at stage 2. First dart fresh start fails
because of DAMP_FWDR problem. Second fresh
start works. Start run 14936. CsI 1096 gain
drift is down to -11%.

17:50 HyperCP folks phone to ask about beam
structure, which has been pretty bad during
our entire shift.

33-37 18:20 Beam gone.

48 18:35 Beam smooths out. We're wondering if HyperCP
complained too.

58-60 18:50 Missing and partial spills.

19:00 Onsplit tape mount - UPH019.

19:25 Onsplit tape mount - UPF031.

21:50 Onsplit tape mount - UPM025.

Discussed the gain drift and E/P situation
with BobT and Ed. Decide to end run early
and update CSQ6 constants. Ashkan wants
DCT0 updated also to fix ineff DC wire

23:10 Stop run. Page Ashkan. Update CSQ6 and
DCT0 constants.

23:15 Onsplit tape mount - UPLA06.

14937 23:20 Start run. Update laser gain reference
plot. This will be picked up at the
beginning of the next run.

23:30 Phone MCR to complain yet again about the
beam structure. They are working on it.

Follow up Notes on Previous Shift
Install CSQ6 constants and update laser gain reference plot. This should
rectify 1096 gain drift problem.

Items to Follow up on Next Shift
Updated laser gain reference plot. Should update at the start of the next

Noticed L3out/L3in has been slowly dropping (down to 0.135). Any ideas?