[BTeam] Hall A Energy discussion

Brian Freeman bfreeman at jlab.org
Mon Aug 24 08:21:59 EDT 2020


Just some clarification  about the Hall A energy discussion of this morning.

  1.  Hall A is requesting a certain energy error (dp/p) -1E-4. This is an abnormal  request.
  2.  With FFB on in Energy mode,  or when running Arc 2 it does as designed and brings the error even closer to zero down to the E-5 range. So not sure what this request is about, and I believe this abnormal request is the root of the Hall A issue. (Cipran ?)
  3.  This issue with monitoring the SLMs, is that we are running 0L04 so far off crest that the spots almost encompass the entire image frame:
     *   https://logbooks.jlab.org/entry/3832990
     *   This was done to reduce Compton rates.
     *   I suggest we back out of the 0L04 change.

BTeam items for tomorrow's meeting? Yves you still on vacation?

Any others chime in, please.

-Brian
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