[b1_ana] Fwd: beam pol.

[Karl Slifer]

---------- Forwarded message ----------
From: Jay Benesch <benesch at jlab.org>
Date: Fri, May 24, 2013 at 2:51 PM
Subject: Re: beam pol.
To: Dustin Keller <dustin at jlab.org>
Cc: Karl Slifer <karl.slifer at unh.edu>


Dustin,

First, my last email to Karl tried to say that with the present injector
all three halls got polarized beam or all three unpolarized.  As a member
of the scheduling committee I've spent lots of time helping tweak to get
acceptable polarization for multiple halls.  Start-up is an odd period,
however, and hall B is delayed beyond hall C.  So the question becomes: is
there an experiment in hall A which also wants about 30 days PAC time with
unpolarized beam after hall C starts up?  And are the A/C pair high enough
priority that Steve and Thia will buy it?  While I've read all the
proposals I can't recall enough to say.  Hall D doesn't need electron
polarization, of course.

Parity experiments have reversed polarization at 30, 240 and 960 Hz.
Pockels cell mechanical ring time forced a cut of order 5% on Qweak at 960
Hz.  MOLLER wants 2 kHz but there's a lot of development remaining since
cut would be >10% with present technology. See Paschke or Dalton for
details on the ringing.

Jay
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