Difference between revisions of "CDC 216 channels"
Line 115: | Line 115: | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|[[Image:cdc_run_32542_dt216.png|thumb|x250px|Run 32535 drift times]] | |[[Image:cdc_run_32542_dt216.png|thumb|x250px|Run 32535 drift times]] | ||
+ | |} | ||
+ | |||
+ | <hr/> | ||
+ | Looking for the oscillation start times - searched for 3 consecutive dips below adc value of 20, starting at sample 0. The first dip time is recorded for each channel. | ||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_run_32542_diptimes_start_0.png|thumb|x250px|Run 32542 dip times]] | ||
+ | |[[Image:cdc_run_32542_diptimes2_start_0.png|thumb|x250px|Dip time in 1 channel vs every other dip time in the same event]] | ||
|} | |} |
Revision as of 14:07, 10 October 2013
Switched HVBs 3 and 5 (all electronics swapped at the chamber)
Event pics
These data (run 32488) were recorded using a filter in the event readout list, so only channels with 6 consecutive samples exceeding a threshold of 116 were recorded, provided that 5 channels had 8 consecutive samples over 124. (pedestal ~ 60, #sigma ~ 16)
Compare resolution with channels 68 (on noisy board E4) and 148 (similar position on different board E14)
Looking to see if zero-crossings are linked to hits in other channels. Zero-crossing time is the sample number when the adc content drops to 0 - pedestal is not subtracted. Pedestals are set to approx 60, with pedestal width ~ 16.
Switched HVBs 3 and 5 (first is at top, increase top to bottom, L to R)
Below: This run started after the CO2 had run out - more Ar reaching boards 1 and 2 (I8, I9, at the top of the chamber) and then 5 (E6)
Below: Switched preamps for HVBs 3 and 5. There is more CO2 in the gas mix. All else unchanged.
Looking for the oscillation start times - searched for 3 consecutive dips below adc value of 20, starting at sample 0. The first dip time is recorded for each channel.