User name Markowitz
Log entry time 22:57:14 on December20,2003
Entry number 114751
keyword=A1 quick look & suggested HV changes
I took the pedestals and single PE channels and got the following table.
The 4th column (labelled "difference") is then the channels per photoelectron, which would ideally be 100.
The 5th column is the software gain correction needed at this voltage in order to give that difference (100 channels per photoelectron) in the calibrated spectra.
The sixth column is a suggested change to the hardware HV values for A1. I assumed 75 V is a factor of 2 in gain and that the change was linear. Most changes are small (and therefore seem to not be controversial). However, channel 8 (pmt 9) is basically not giving any signal now and needs inviestiaged, while