Log entry time 16:31:07 on April 01, 2004

Entry number 81138

Run Coordinator's Report for 31 March Swing to 1 April Swing

Summary

We ran pretty well overnight; vertical beam steering reduced halo rates to nominal values. Beam back very late into Day shift after beam studies and installation of Hall A laser in injector due to problems getting beam out of injector and various beamline issues.

Significant News

• Harp scans performed (for pictures see ELOG entry 1203850). IHA3HG0 Harp still very noisy.
  
• After Harp scans, MCC lowers vertical position at G0 and G0B BPM's by approximately 0.5 mm, which reduces halo rates to nominal values.
  
• The new interface box for the DMCH's apparently does not work in 120 Hz mode. 120 Hz runs unable to be performed over the last day. This will be addressed by Paul with input from Orsay.
• Relatively smooth LH2 running over night, but MCC reports systematic shifts in E-lock cavities. BPM's near these cavities confirm that this effect is a real energy shift in the beam.
• Beam taken at 9:00 for beam studies and to install Hall A laser in injector.
• Paul investigates interface box for DMCH's: New interface box reduces ratio of measured asymmetry widths to statistical widths for Detectors 1 and 2 of Octants 2 and 6 (but not for Detectors 13 and 14 in Octants 4 and 8), but does not work in 120 Hz mode. For now, other ideas emerge, we will go back to the old interface box to ensure we can perform 120 Hz runs.
• A few green block runs for French DNL, and NA DNL runs studies performed while beam is gone.
  
• After discussions with PD and MCC folks at 8:00 meeting, they agree to spend 1 hour after beam is back as "Recovery" time after beam studies to investigate halo issue.
• Difficulty getting beam out of the injector, and into Hall C. Beam not back until almost the end of Day shift, so halo studies get scrubbed.
• Setup for BCM calibration (rock RHWP until we find a zero crossing in charge asymmetry).
  

Plans

1. BCM Calibration.
2. Wells plot data.
   
3. RIP scans and get feedback operational.
4. LH2 production running until 9:00 on 4/2/04 when MCC takes beam for beam studies.
   

Concerns

• Spikes in French electronics
• Beam steering: Harp and BPM positions off by more than 0.5 mm from Moller BPM's all the way down to the G0 target.
• HALO! More specifically, the beam steering issue above which we believe is the cause of the halo, as the absolute halo rates are only X2 relative to nominal.
  
• Non-statistical widths in detectors 13 and 14 of octants 4 and 8.
• Non-understood influence of Interface Box to DMCH's. Spare does not work in 120 Hz mode.
  
• Apparent increasing frequency of NA LTD errors. (This should be alleviated by Brian's work on the LTD's).
  
• Crosstalk with target IOC and target FSD box when the Musson box is rebooted remotely
• Changed behavior of BPM 3H00C Y position with respect to other hall BPMs.
• Discrepancy in beam current measured by BCM1/2 and the MPS BCM (This should be cured after the BCM calibrataion.).