GEM Meeting, April 26, 2010
From Hall A Wiki
Analysis of Pedestals, runs taken until April 21, 2010 (Francesco)
Analyzed all the run listed in the Run List, until run 27402.
The pattern is stable for UVA GEM both chambers, while it looks having two different "states" in the INFN chambers. Within one hour the pedestals looks very stable (run 23355-23358) Pedestals calculated from a pedestal-run (27336) have no significant differences with respect to the values extracted from an on-beam run, but of course the noise is smaller. The pedestals show a "common-mode" shift on a 24-hour time-scale (comparison between runs 27355-27358 and run 27402)
Pedestal runs 27456 HV Off 27461 HV ON
File rich_ped_bottom_happexsp_27456-zero.dat and rich_ped_bottom-480.dat have no pedestal subraction on channel 0 ,239,240,479 of each planes
