Difference between revisions of "CDC 216 channels"
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|[[Image:cdc_run_32535_diptimes_start_90.png|thumb|x250px|Run 32535 dip times]] | |[[Image:cdc_run_32535_diptimes_start_90.png|thumb|x250px|Run 32535 dip times]] | ||
|[[Image:cdc_run_32535_diptimes2_start_90.png|thumb|x250px|Dip time in any one channel vs every other dip time in the same event]] | |[[Image:cdc_run_32535_diptimes2_start_90.png|thumb|x250px|Dip time in any one channel vs every other dip time in the same event]] | ||
+ | |} | ||
+ | |||
+ | <hr/> | ||
+ | |||
+ | Switched off HV to CDC | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_run_32544_ringers.png|thumb|x250px|Run 32544 channels with oscillations]] | ||
+ | |[[Image:cdc_run_32544_diptimes_start_90.png|thumb|x250px|Dip times]] | ||
+ | |[[Image:cdc_run_32544_ox_5.png|thumb|x250px|Channel with hit <5 samples before oscillation in another channel]] | ||
|} | |} |
Revision as of 11:53, 11 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.
Changed search start time to sample 90.
Previous run, before preamps 3&5 were exchanged
Switched off HV to CDC