[BTeam] Hall A Energy discussion

[Mike Spata]

Good morning,

The last image<https://logbooks.jlab.org/files/2020/08/3830068/2008744.1.png> of the Lambertson that was logged had Hall A beam left of center. It may have been adjusted already and not logged. Hard to say if it's too far left of center since we can't see the wires anymore but might be worth taking a look. The comment was made this morning regarding the Hall B beam so if you are looking I would line them up as best you can.

I agree that the bunch compression is too large (>10 degrees from Eric's log) and we should not have to run like this for good transport. Definitely a topic for B-Team.

Mike


--
Michael Spata
Deputy Associate Director
Accelerator Ops and R&D
Jefferson Lab
12000 Jefferson Avenue
Newport News, VA 23606
Cell: (757) 876-0528<callto:(757)%20876-0528>

________________________________
From: BTeam <bteam-bounces at jlab.org> on behalf of Brian Freeman <bfreeman at jlab.org>
Sent: Monday, August 24, 2020 8:21 AM
To: bteam at jlab.org <bteam at jlab.org>; Michael Aiken <aiken at jlab.org>; HyeKyoung Park <hkpark at jlab.org>; Paul Vasilauskis <vasilaus at jlab.org>; ciprian at jlab.org <ciprian at jlab.org>; Daniel Moser <moser at jlab.org>; Eric Forman <eforman at jlab.org>
Subject: Re: [BTeam] Hall A Energy discussion

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/bteam/attachments/20200824/815c4a98/attachment.html>