Log entry time 11:53:18 on March 08, 2004

Entry number 79017

This entry is a followup to: 78876

RC Summary

Sunday, 7 Mar. owl through Monday, 8 Mar. owl

• Data taking on LH2 target with 40 ľA and with 6 mm hole target.
• IHWP was OUT.
• LH2 target parity quality
  • 15.8 hours of good data for this 32 hr period (runs 20536-20567) out of 17 hours on tape.
  • Overall efficiency: 29.1% (9.3/32) (very bad)
  • Beam (no trip) efficiency: 70.9% (11.2/15.8)
  • Parity efficiency: 83.0% (9.3/11.2)
  • Total parity hours: 240.5 (runs 19815-20567). We made it!
  • Overall IN/OUT charge ratio: 1.14

Achievements and events

• Production running at 40 ľA and running with 6 mm halo target.
• 120 Hz runs taken during
  • Sunday day shift: run #20542 analyzed
  • Monday owl shift: run #20566 analyzed
• Energy modulation runs taken during
  • Correction to previous summary We did take a energy modulation run on Saturday (run #20525), but it wasn't labled as such in the log. I've been caught not reading the shift summaries...
  • Sunday day shift (#20543)
  • Monday owl shift (#20567)
• G0Integrity results recorded during the
  • Sunday owl shift
  • Sunday day shift
  • Sunday swing shift
  • Monday owl shift
• Convergence of beam parameter asymmetries checked
  • Sunday owl shift
  • Sunday day shift
  • Sunday swing shift
  • Monday owl shift

Plans

• We are down for a maintenance period until (at least) Thursday swing. There is a lot to do:

  Task	G0 Responsible	Work	Done
  Install TLDs	McKee/Martin
  Replace IOCSE20	Williamson	MCC(?)
  Install more green blocks. (?)		Hall C
  Resolve "SMS PLC crash/freeze leads to fastsump"	Williamson
  SMS/target (?) vacuum pump maintenance	Spayde	Brindza
  Position/Energy modulation coil checkout/maintenance	Rutledge
  G0 harp signal noise	Williamson
  Harp PMTs connect/checkout HV and signals	Vulcan
  Install Halo 7,8	Phillips
  Fix BPMs C07, C20	Pitt	P. Francis
  Pivot BPM noise resolution(?)
  Vacuum photodiode	Pitt
  Laser phase noise	Nakahara	Poelker/Graims	100%
  Laser circular polarization
  Musson box timing issues		Musson
  FastSEE software issues		Dickson (?)
  Channel 16 HV cable move and software fixes	Breuer		25%
  CHC UPSs	Vulcan		100%
  Survey SMS vs. FPDs (?)	Roche
  Recovery plan	Martin/King

Concerns and Their Resolution

• Spikes in the French timing spectra appear from time to time. Louis is here and will be investigating, and has provided a scheme (see logbook entry #78667) for trying to learn more from the next run that shows them.

  Jianglia has provided an alarm on the realtime analysis. It may still need some work, but it has alerted the shift crew...

• More North American electronics errors persist. The error rate seems to be somewhat improved now.
• The issue of variation of BPM response with current has been investigated by looking at the replay and the EPICS archive (Log Book Link). Indeed, for the Y coordinate of the girder BPMs there appears to be a problem when using the 20 uA pulsed beam. We need to find a way to run the harps at higher current to find the proper BPM readings when we are doing real data collection. It is also possible that the BPMs behave differently with and without the raster. Preperations for a diagnostic test are underway, but the actual test won't happen until after the maintenance shutdown.
• The harps on the G0 girder have very large readout noise, and situation that is complicating our attempts to diagnose the BPM problem. If possible we would like to work on this over the maintenance.
• Musson box timing question remain.
• We should spend some time during the 4-day maintenance period to try to find a way to turn the magnet power supply off at full power without causing a fast dump and without compromising our quench protection.
• IOCSE20 seems to be needing more trips. A older, slower (but hopefully more robust) replacement is available. Time to install ~2 hours. No guarantee of that it will help. We probably want to have it put in during the maintenance period, but don't want to use beam time unless the problem becomes worse.

Accumulated Data for the RC's Weekly report

ABU:

	Owl	Day	Swing	Daily Total
Tuesday	5.15	3.47	6.13	14.75
Wednesday	5.99	3.78	5.67	15.44
Thursday	6.48	3.70	6.96	17.14
Friday	3.90	4.07	5.85	13.82
Saturday	6.45	6.70	5.97	19.12
Sunday	2.54	6.52	4.86	13.92
Monday	4.53	0	0	4.53

Total: 98.72

Non-trivial BANUs: (with causes)

	Owl	Day	Swing	Daily Total
Tuesday
Wednesday
Thursday		0.17[1]		0.17
Friday		0.19[2]		0.19
Saturday	0.33[3]	0.32[4]	1.87[5]	2.52
Sunday	4.86[5][6]			4.86
Monday	0.82[7]			0.82

Total: 8.56 BANU notes:

1. Related to spikes in the French detectors. Probably under-reported.
2. Target motion out of and into the beam for CW harp scans. Why does the target take 10 minutes to complete a move?
3. DAQ crash.
4. Target (Did we move it out for the Moeller measurements?)
5. SMS fast dump. Carries across the shift change into Sunday morning for 2.98 hours.
6. Target related for 1.81 hours. Two access.
7. 0.22 hours DAQ, the rest to IOC reboots and a power glitch casue counting house computers to reboot..

Raw data: List of shift summaries

• Sunday owl shift: Summary and ABU report
• Sunday day shift: Summary and ABU report
• Sunday swing shift: Summary and ABU report
• Monday owl shift: Summary and ABU report