General Experimental Requirements
measure APV ~ -3 to -40
ppm with precision DAPV /APV ~ 5%
statistical and systematic
uncertainties roughly equal
Statistics (5%
1013 - 1014 events):
• high e-
polarization (70-80%)
• high e-
current (40 mAmps)
• high
luminosity (2.1 x 1038 cm-2 s-1)
• large
acceptance detector (0.5-0.9 sr)
• long
target (20 cm)
• high
count rate capability detectors/electronics (1 MHz)
Systematics (reduce false asymmetries,
accurately measure dilution factors):
• small
helicity-correlated beam properties
• ability
to isolate elastic scattering from other processes
