User name R. Michaels
Log entry time 22:55:30 on October 11,1998
Entry number 2692
This entry is a followup to: 2671
Followups:
keyword=repeatability runs and SUMMARYSame setting (120 units) on waveplate. Repeatibility test.
Run 1709 (spectr), 8085 (happex), 4029 (moller)
spectrometer q1 0.0%, q10 -0.05 % (error unknown)
HAPPEX +0.195 +/- 0.006 %
Moller -0.18 +/- 0.02 % (again the relative sign of HAPPEX/Moller did
not change)
Another repeat:
Run 1719 (spectr), 8089 (HAPPEX), 4031 (Moller)
spectrometer q1 0.0%, q10 -0.04%
HAPPEX +0.164 +/- 0.011 %
Moller -0.175 +/- 0.02 %
SUMMARY of tests so far:
1. HAPPEX and Moller appear to be in excellent agreement, but
beware of signs -- I'm not sure of the relative sign, though it
remained fixed.
2. While the Q asymmetry responds to the have waveplate, it never
is nulled to zero (best is about 0.1%) and furthermore it appears
to drift by order 0.1% over time.
3. Alarmingly, the spectrometer scalers measurement of charge
asymmetry does not make sense.
See the plot of scan from Moller DAQ below.
FIGURE 1
