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- 1st Engineering Run
- we are here
- 2nd Engineering Run
- Forward angle measurement
- Expected Results:
- (GEs + a GMs) for 7 values
of Q2 between 0.1 – 1.0 (GeV/c)2
- 3 Backward angle measurements
- Expected Results:
- Separated GEs
, GMs , and GAe for Q2
of 0.3, 0.5, and 0.8 (GeV/c)2
- NàD axial transition form factor
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- 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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- G0 has a broad experimental program that will result in the
first separated values of GEs, GMs,
and GAe over a wide range of Q2
- 1st G0 Engineering Run successfully completed
- all hardware operational
- obtained ~2 days of test asymmetry data
- clearly see weak interaction
- no unexpected false asymmetries seen
- On track to resume running in October 2003
- Look forward to first physics results late 2004
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