1st Engineering Run - successfully completed
•Current
Work
–False Asymmetries
–Helicity correlated beam
charge effects (goal <1ppm over 700 hours)
–Helicity correlated beam
position effects (goal <20 nm over 700 hours)
–Deadtime
–typical deadtime ~10% with
rates of ~1-2 MHz/detector
–causes false asymmetries
when combined w/nonzero charge asymmetry
–uncorrected effect ~15% ;
after correction ~1% ; Afalse ~0.01ppm
–Background
Determination
–requires both yield and
asymmetry of background
–yield ~10-25% depending on
detector
–|Aback| ~ |Aelastic| near elastic peak (preliminary)
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