Shift Summary for Owl shift, 9/11/99

Sydney A. Taegar (
Sat, 11 Sep 1999 05:48:58 -0700 (MST)

Shift Summary for Owl shift, 9/11/99

On Shift: Albert Erwin, Sydney Taegar

Hours of beam delivered at all intensities: 8.0/8.5
Hours of beam delivered at nominal intensity: 8.0
Hours of E832 data (special runs not included): 7.25
Hours of special runs (laser scans, muon runs...):

Accounting of lost time:

KTeV: 45 min - Diagnosis and access to swap ET board for CsI channel 1435.
MCR: 30 min - Problems taking us out of access.

Runs ended this shift:
Run 14499 - 20.3M events - BEAM_832

Tapes brought to FCC this shift:

Accesses during shift:

Sydney and Albert replace ET board to fix missing dynode
signal for 1435.

Overview of shift:

Smooth E832 running interrupted by access to swap ET board
for 1435. Channel 1435 inefficient for run 14499 spills 305 - 362.
Channel 920 inefficient for spills 360ish - EOR.

Description of Shift:

run spill time comment
14499 00:00 BEAM_832 run in progress.
AE and previous shiftees waiting for ST to arrive.

00:06 ST arrives...

01:30 NM2D1 error in EPICURE: 3603A is below
3606A lower limit. Inform MCR - they
bring it up a few amps and then notice
that autotune was off. Beam targetting
has been ok though.

305 01:35 Beginning at spill 305, continuous
HCC inefficient alarms for CsI 1435.
1435 has no dynode signal at monitoring
station; anode signal is fine. Consult
with Ed,Julie. Cycling HV for 1435
has no effect. Decide to make access
to check signal at ET.

01:55 AE and ST on access to investigate missing
dynode signal. Problem is blown input
buffer on ET board in TE crate slot 2.
Swap ET board.

02:15 Call out of access. Notice that someone
has been tampering with the ET test stand --
the HP pulse generator is missing!

02:25 MCR calls - having trouble taking us out of
access mode.

363 02:42 Beam returns.

04:30 Discover intermittent (~every 10-20 spills)
"HCC is inefficient"
warnings since beam returned are real:
CsI 920 (large channel) has missing dynode
signal at monitoring station. ST earlier
checked but failed to notice missing HCC
bit in laser illumination on kdisp. :(
On consultation with Ed, decide to wait
for a downtime/end of shift to fix.

06:00 Mount onsplit tape QKNL34.

07:00 Tapes full. Run 14499 ends.
Call for access to swap ET board for channel 920.

Follow up Notes on Previous Shift

Forgot to update pedestals.

Items to Follow up on Next Shift

Monitor HCC hotbits and inefficient channels carefully.
High temperature and multiple power cycling during
9/10 day shift may have caused some damage.

Update pedestals after run/during downtime since we forgot
to do so in the frenzy of swapping ET boards.