Hi!
I am a little confused by the numbers below.
I have been looking on elog, compared with the MySQL database info etc.
It looks like immediately after switching to polarized H2, runs between
12144 and 12187 were at a target spin angle of 20 degrees (is that right
or just wrong epics read-back and if right why is it not mentioned
anywhere else?)...
After that, runs 12188 to 12274 are at a target spin angle of 48 degrees,
but the total is 20 kC not 12 kC as mentioned below (maybe some of them
were mistakingly marked as valid or the below info was not up-to-date?)...
Anyway, most importantly, Karen's email from 4PM yesterday says we are
running at 48 degrees and will continue like this, while all run numbers
since 12276 (Tuesday!) up to now have a target spin angle of 32 degrees.
I am just confused by the disagreement between what I see on elog and in
these various emails... can anyone explain, please?
Thanks you!
Adrian
>> We are back up to 165 mA on ABS hydrogen. The cell temperature is
>> down a bit, now at 120 K. Beam lifetime is about 30 minutes. We have
>> collected 30 kC on polarized hydrogen since 10/28. Almost 12 kC were at 48
>> degrees spin angle, the rest are at 32 degrees. The target polarization is
>> measured to be independent of spin angle. The product of beam and target
>> polarizations is about 0.45, for a target polarization of about 67%. Chris
>> Crawford gets about 75% with tighter cuts.
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