On Thu, 26 Feb 2004, Electronic Log Book wrote:
I am concerned that alwys flipping the spin when the beam falls below
a certain current is a good way of building in false asymmetries. I
would prefer to see the spin flipped for alternate complete fills or,
if it is to be flipped during a fill, then it should be done in a
random fashion.
> Operators: franklin zhangchi akdogan
>
> Beam came back a little before 8:00. Took 3 runs of polarized
> deuterium (5072-5074), then spent some time setting up spin flipper.
> We were able to find a set of parameters which allowed it to work
> with high efficiency. At present, we are taking polarized D2 data
> again, filling to 100 mA, spin flipping at 70 mA, and dumping beam at
> 50 mA. The discrepancy between P+ and P- which has been present in the
> Compton results for the past several days is apparently all false
> asymmetry. Spin flipper will run in automated mode tonight to document
> this
> more thoroughly.
>
>
>
>
-- John R. Calarco Dept. of Physics Univ. of New Hampshire Durham, NH 03824 phone: (603)862-2088 FAX: (603)862-2998 email: calarco@unh.edu
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