[Halla_running] [New Logentry] Hall A Status update -- Sunday AM

[brads at jlab.org]

Logentry Text:
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Well how about that -- we've had a few shifts of actual good beam!

The current has been successfully run up to 20+ uA in Hall A.  We've been running at 10 uA production with fairly stable beam.

The energy oscillation in the Accelerator was traced to issues with the LCW cooling system on the NL.  MCC ended up magnetically separating beam to Hall A and did get Hall B back online.  The mag separation, however, does prevent beam to Hall D.

The plan for today is for Accelerator to take beam away around noon to work on the RF separator and get Hall D back up.  There is some hope that will be possible now that the energy oscillations are fixed.  The interruption is expected to be 4--8 hours.

Hall A will use the down time to switch the LHRS to positive polarity so we can run an elastic calibration when beam returns.  The LHRS and DVCS Cal will be rotated to new angles during the same down.

NOTE: OWL shifts are in terrible shape starting Monday night -- Please sign up ASAP!
  https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?experimentRunId=HALLA-FALL2014


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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3329134
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