<div dir="ltr"><div><br></div><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Jay Benesch</b> <<a href="mailto:benesch@jlab.org">benesch@jlab.org</a>><br>
Date: Fri, May 24, 2013 at 2:51 PM<br>Subject: Re: beam pol.<br>To: Dustin Keller <<a href="mailto:dustin@jlab.org">dustin@jlab.org</a>><br>Cc: Karl Slifer <<a href="mailto:karl.slifer@unh.edu">karl.slifer@unh.edu</a>><br>
<br><br>Dustin,<br>
<br>
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.<br>
<br>
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.<font color="#888888"><br>
<br>
Jay<br>
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