Log entry time 23:49:06 on April 22, 2004

Entry number 82949

Run Coordinator's Report for 22 April Owl to 22 April Swing

Summary

Significant News

• Magnet  power supply causes  grief well into the wee hours of the morning: Magnet fastdump post-mortum
•  For info on Musson box voltage drift & timime lock see Musson Box and related entries.
  
• Following the SMS recovery, the beam feedback code could not be run from the analysis-minder.   This problem confounded
data taking until 0900hrs when the code was fixed.  The problem was linked to a software compile at approx 0345.  

•  Next on the grand tour of events, was a successful Moller scan, a 1/2wave plate change followed by another Moller scan. The 1/2 plate is now  OUT.  Mean polarization  measured for the IN and OUT states respectively
  
  IHWP IN : -74.90 +/- 0.52
  IHWP OUT : 74.47 +/- 0.42
• Per Discussion in the morning MCC meeting,  it was decided to  give MCC 2 hours to optimize the injector tune in an attempt to reduce the number of beam trips.  The reasoning being this would lead to a quieter, more productive data taking weekend.  Beam was returned an hour and a half late, however stability seems to be better.... But Hall A has been off line due to magnet problems....
  
• Shortly into beam and production running, the ESR warm return pressure climbed above the LHe reservoir pressure.   This prevented gaseous He from flowing across the power leads.  They warmed up, the magnet Quenched. Recovery at about 1800hrs and we return to production running. 

Short term Plans

• Continue with production data taking on LH2 until beam studies period Monday morning 09:00am when beam will taken away for beam studies.
• Beam energy measurement Thursday evening. Mark Jones will come in about 2030hrs  for this.
• Moller/IHWP insertion/Moller every 3 three days.
•  Take a 120Hz run once per day, preferably on day shift.

Longer term Plans

• Moller/IHWP insertion/Moller every three days.
• NO beam studies until Monday morning.
• 24hrs of aluminum frame target running. Discussion ongoing.
• Deuterium target(?)
• Long 10uA running for deadtime studies(?). This is still under discussion, also because Brian Quinn and Angela Biselli proposed a different way to extract the "deadtime" of sub-threshold particles.

Concerns

• HV files not loading correctly and need to be watched: HV Restore
  
• What raster focus were we running with in the last few weeks?
• After replacing the IOC SE20 controller board there are still a few IOC SE20 crashes, but they have gotten a lot less frequent (about once a shift or once every 2 shifts). 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.
  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. The big fan in the cage should be started to increase airflow to the FR electronics rack. See Paul King's log entries Monday and Tuesday.
• 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.