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User name pking
Log entry time 22:25:09 on May 13, 2004
Entry number 85004
keyword=Proposed detailed run plan for transverse running
Date: Thu, 13 May 2004 19:06:29 -0400
From: Paul King <pking@jlab.org>
To: Douglas Beck <dhbeck@uiuc.edu>
Cc: Mark Pitt <pitt@vt.edu>, Jacques Arvieux <arvieux@jlab.org>,
Jianglai Liu <jianglai@jlab.org>, Kazutaka Nakahara
<nakahara@jlab.org>,
Elizabeth J. Beise <beise@physics.umd.edu>, Julie Roche
<jroche@jlab.org>,
Joseph Grames <grames@jlab.org>, Dave Gaskell <gaskelld@jlab.org>,
Tanja Horn <hornt@jlab.org>
Subject: Proposal for running over the next few days.
Hello,
After some discussion with Joe and Reza, the Wien change to 90
degrees would probably take 1.5 - 2 hours, instead of the ~0.5 hours
for the change to 60 degrees. So this is what I suggest for the
running:
a) Request the Wien angle to be changed to -57.5 degrees at
16:00 on Friday afternoon. If the other halls object, this
change may need to be pushed earlier to 15:30 to fall within
the "leakage" running period.
b) The SOS tests are currently scheduled for 8 hours beginning
at 16:00 on Friday, including switching the water for the
magnet power supplies from the SMS to the SOS magnets.
Last time the switch back started after the eight hours, so
we could guess that the switch back to G0 running might not
be until 02:00.
c) Begin running with transverse beam at the highest current
possible (hopefully 40 uA).
Take an IA, and PZT scan and set up feedback. [1 hour]
d) Take a 1-hour run at 40 uA on LH2.
e) Take a 10 minute run with Hall C laser off to check the
leakage effects for this data.
f) Take four 1-hour runs at 40 uA on LH2.
Then repeat steps (e) and (f).
g) It would probably be a good idea to take a Moller measurement
during the day shift, so that we have a cross-check on the
spin; Tanja suggests this might take an hour.
Until we are ready to do that, take 1-hour runs at 40 uA
on LH2 as in (e) and (f).
h) At about 15:00, change the IHWP state.
Take an IA, and PZT scan and set up feedback. [1 hour]
i) Take a 1-hour run at 40 uA on LH2.
j) Take a 10 minute run with Hall C laser off to check the
leakage effects for this data.
k) Take four 1-hour runs at 40 uA on LH2.
Then repeat steps (j) and (k).
L) At 04:00 on Sunday, The last 8 hour period of Hall A off
running begins.
Take 1 hour of 40 uA Hall C running, followed by about 30 minutes
of Hall C laser off.
m) Have the Wien angle changed back to +2.5 degrees. Joe thought
that this could be done by the operators in about a half hour,
but if there was a problem that they had to call in support, it
could be an hour or two after that beam would be restored.
n) Take the Hall A off longitudinal running as deisred.
If the Wien change went well and only took a half hour,
we would have six hours for the longitudinal leakage running.
o) At 12:00, the beam goes away for about 4 hours to setup the
Hall A pass change.
We may want to have the Wien angle changed back to -57.5 degrees
either during or after the pass change set-up.
p) If we have had the Wien angle changed again, take transverse
data, otherwise take longitudinal data.
The plan as outlined above would give about 23 hours of transverse
running on Saturday, with perhaps another 14 hours of transverse
running on Sunday and Monday. If we get 50% efficiency, that would
give us 12 or 19 hours of data with the spin at 60 degrees.
This plan does not include any more frame running in transverse
mode. Does anyone think that we should take some more? Actually,
I think maybe we should take an hour or two again as a cross-check
at this Wien setting.