Summary of E832 Week 7: July 22-29

Rick Kessler (kessler@hep.uchicago.edu)
Fri, 30 Jul 1999 10:42:52 -0500

Summary of E832 Week 7: July 22-29 Runs: 13985 14060

Hours of beam used/delivered : 69.4/82.0 = 0.85

Vac00 (week) : 0.185 million
Vac00 (99run) : 1.844 million

Live DAQ with beam/elapsed time (week) : 0.44
Live DAQ with beam/elapsed time (99run) : 0.56

Comments: Most beam loss due to two ComEd shutdowns followed
by one day recovery. Also had a ground fault.

KTEV used only 85% of the available beam ==> worst ktev week!
KTEV loss due mainly to DAQ problems:
DLT failure, stuck DDD veto, ktev4 died and ktev3 crashed.

hours of beam:
Shift used/delivered comment
---------------------------------------------------------------------
Fri July 23 OWL: 0.0/0.0
DAY: 0.0/0.0 ComEd shutdown
EVE: 0.0/0.0 Begin recovery from shutdown

Sat July 24 OWL: 0.6/1.1 BOA ~ 2, SEM = 3.5E12
DAY: 3.5/4.0 BOA ~ 2, SEM = (2.5-3.3)E12
EVE: 0.0/0.0 TeV cryo problems, ground fault

Sun July 25 OWL: 0.0/0.0
DAY: 4.7/6.0
EVE: 5.7/7.5 ktev2 crashed; BOA>2, SEM < 3.5E12

Mon July 26 OWL: 6.3/6.4 BOA ~ 1.3, SEM ~ 3.8E12
DAY: 1.5/2.3 another DLT failure; begin ComEd shutdown
EVE: 0.0/0.0 Begin recovery from shutdown

Tue July 27 OWL: 0.0/0.0 ?????
DAY: 0.0/0.0
EVE: 7.4/7.8

Wed July 28 OWL: 7.2/7.5
DAY: 8.2/8.5
EVE: 5.6/8.4 Lost pipeline stream, then DDD2 veto

Thu July 29 OWL: 4.9/7.0 ktev4 died.
sub-total 55.6/66.5
DAY: 6.8/8.0 ktev3 crash; ktev4 power supply replaced.
EVE: 7.0/7.5 atev2 re-boot (mouse stuck?)
---------------------------------------------------------------------
TOTAL 69.4/82.0 = 0.85
---------------------------------------------------------------------