User name paschke
Log entry time 22:22:11 on July18,2005
Entry number 148530
This entry is a followup to: 148525
keyword=quality of new pedestals
The "quality" of these new bcm pedestals may be observed in the following
plots. Below I show the double difference vs. charge asymmetry for bcms 1 - 3,
then 1 - 2. There are apparent 1-2% pedestal errors between the bpms here.
This is not noticibly better than the what was seen before I went throught this
Another criteria, possibly more sensitive, is double difference, especially at
low current. So, for Run 3663, event <10000, bcm3 is about 10k channels. The
double difference width before the new pedestals was 360 ppm, now it is 338
ppm. Hardly seems worth all the trouble.