[BLAST_SHIFTS] Shift summary B shift 12/15

From: Chi Zhang (zhangchi@MIT.EDU)
Date: Sun Dec 15 2002 - 15:54:29 EST


Arron and Ben switched to unpol gas system before leaving. We continued to
take data till about 11:00am when Hall was open.

three runs 3148, 3149, 3151 are taken with 0.3sccm wave plate in and out
and empty target.

Later on, analyzed the data taken over night(runs 3140-3151). Some
observations:

Normalized rate is with ABS is 3% of the unpol system. which translates to
0.8 to 1*10e16 nuc/sec into the target cell.

false Asymmetry (wave plate out - wave plate in)/total:

        left14 with right 1 right14 with left 1
ABS -1.5% -0.1%
UNPOL -2.1% -4.6%

ABS calculations are based upon about 160 events collected over night(in
each paddle combo, each wave plate position)

See log book for detail.

Yuan and Chi



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