User name Antonin
Log entry time 01:18:18 on August17,2001
Entry number 70907
keyword=charge asym slope calibrationI made a calibration of the charge asymmetry slope, insertable HWP (in).
run 1969 was a test run to look at the correction the feedback made and it's look like
that it 's overcorrecting 400 ppm to -200 instead of 0.
the beam is really bad for the calibration we have fluctuations (like Todd shows in his entry) which causes big fluctuation in charge asymmetry ->increase the error.
bcm2 is like to be less sensible to the beam mood and give better results , bcm1 don't give a gaussian distribution anymore (run 1972) for the charge asym! (the values of charge asymmetry are more tighted for bcm2 and that's a gaussian distribution at least).
The slope is 13.3 ppm/step on my plot. I setted to 14, the value I was expected was around 20 !
run 1977 is a test to see if the feedback works.
run ....................RHWP.............Qasy +-errQasy
1970 ....................300................ -196+-40 (big rms -> big error !)
1971 ....................310................. -96+-33
1972.....................320..................-20+-21 (bcm2)
1973.....................330.................. 99+-25
1974.....................340.................. 297+-19
1975.....................350.................. 419+-20
1977..................320-322.............-15+-20
FIGURE 1
