Log entry time 23:19:29 on April 19, 2004

Entry number 82619

Run Coordinator's Report for 18 April Swing to 19 April Swing

Summary

Continued with production data taking on LH2 data during owl shift. Beam was excellent at times. Some periods with Frequent beam trips and IOC crashes. At 7am Beam OFF for CD-0 tour. IOC SE20 was changed after tour had left the Hall. Beam restoration, IHWP changed to IN. Started with production data on LH2, but seeing strange left-right asymmetry in pion production.

Significant News

• Production data taking with parity quality beam on LH2. Very smooth running during for most of the time. Some periods with frequent beam trips which also triggered some IOC SE20 crashes.
• 07:00am beam was taken away to open accelerator and Hall(s) for the CD-0 tour.
• IOC SE20 crashes continue on a rather regular basis (still about 2-3 per shift).
  The IOC was changed during the downtime after the CD-0 tour (see ELOG-entry number 1207627)
• Beam restoration takes longer than scheduled. (1800 instead of 1300).
• Moller, IHWP change, Moller. Results can be found in log entry number 82588
• IA/PZT scans look horrible (scraping in the INJ). Kaz asked MCC to improve the beam and we get usable beam at 2100.
• Strange left-right asymmetry in pion rates for Det1-10 in Oct 1-4. See Dave's and Julie's log-entries.

Short term Plans

• Continue with production data taking on LH2 until beam studies period tomorrow morning 09:00am when beam will taken away for beam studies until 11:00am.
• Moller/IHWP insertion/Moller every 3 three days.
• Beam energy measurement next week during the day shift. Mark Jones will be present for this.
• Continue with LH2 production running.

Longer term Plans

• Moller/IHWP insertion/Moller every three days.
• A long (restricted) access is planned for Wednesday to pump the cryo line for the magnet (Damon). This will be done during a 4 hr beam studies period from 09:00am to 01:00pm. If the IOC crashes will not improve we will also try to get some maintenance done on this during this period.
• Beam energy measurement of the beam into Hall C (Mark Jones).
• 24hrs of aluminum frame target running (?)
• Deuterium target(?)
• Long 10uA running for deadtime studies(?)
• PMT gain calibration at 1uA (6hrs at Julie's request)

Concerns

• Left-right asymmetry in the data after the beam restoration from the CD-0 tour. This is under investigation while writing this report.
• Even after replacing the IOC SE20 controller board there are still rather frequent IOC SE20 crashes. The IOC crashes in way that makes it hard to detect: The EPICS values freeze at a non-zero value. If this happens the IOC has to be rebooted. Paul King has written a script that gives an audible alarm if the G0 BPM flatline and the PD will talk to the software people to get an alarm implemented at the MCC. We will also try to find out if the IOC can be moved to a more radiation safe area in the Hall during the long access next week.
  When the IOC crashes the run should be immediately stopped and a note put in the end-of-run comments and in the run summary that states that the IOC crashed at the end of the run.
• Temperature in the electronics cage is rising during the afternoon hours above alarm levels. We started the big fan in the cage to increase airflow to the FR electronics rack.
• Spikes in French electronics, possibly caused by a network problem. Paul King claims that the buffer of ROC3 may not be big enough (currently ~2sec) and could be increased up to ~3sec, but then we would have to boot ROC3 every time we change the configuration. Shift crew should also clearly mark runs with spikes.
• NA LTD errors still occurring at a small rate. Brian has generated a "HowTo" document for trouble shooting.