Difference between revisions of "CDC odd events"
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50/50 Ar/CO2 2100V | 50/50 Ar/CO2 2100V | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |[[Image:cdc_run_32099_evt_425_A8 | + | |[[Image:cdc_run_32099_evt_425_A8.png|thumb|x150px|Board A8, run 32099 evt 425]] |
− | |[[Image:cdc_run_32099_evt_425_B1 | + | |[[Image:cdc_run_32099_evt_425_B1.png|thumb|x150px|Board B1, run 32099 evt 425]] |
− | |[[Image:cdc_run_32099_evt_425_B9 | + | |[[Image:cdc_run_32099_evt_425_B9.png|thumb|x150px|Board B9, run 32099 evt 425]] |
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_noisebursts_run_32099.png|thumb|x150px|Time (? event number) of noisebursts (all 72ch dipping below 0)]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_run_32099_xthr.png|thumb|x150px|Threshold crossing times]] | ||
+ | |[[Image:cdc_run_32099_zthr.png|thumb|x150px|Threshold and zero crossing times]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Same straws, different day - ran overnight, no mass-noise oscillations occurred | ||
+ | |[[Image:cdc_run_32062_zthr.png|thumb|x150px|Threshold crossing times from a later run]] | ||
+ | |} | ||
+ | |||
+ | Possible clues from an earlier run | ||
+ | |||
+ | ch0:attenuated coincidence signal, ch1: attenuated discriminator signal from upper scint, ch2: atten discriminator signal from lower scint. | ||
+ | Their shapes look a bit odd because of the flash's shaping. | ||
+ | |||
+ | NB apart from during the pulse itself, the logic signal level usually varies by less than +/- 1 adc unit | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Run with a noise burst | ||
+ | |[[Image:cdc_run_32088_evt59.png|thumb|x150px|Event data from logic signals and 21 of the 24 CDC channels]] | ||
+ | |[[Image:cdc_run_32088_evt59_zoomed.png|thumb|x150px|zoomed in around the noise]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Clean run for comparison | ||
+ | |[[Image:cdc_run_32088_evt60.png|thumb|x150px|Event data from logic signals and 21 of the 24 CDC channels ]] | ||
+ | |[[Image:cdc_run_32088_evt60_zoomed.png|thumb|x150px|zoomed in ]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Another run with a noise burst | ||
+ | |[[Image:cdc_run_32088_evt113.png|thumb|x150px|Event data from logic signals and 21 of the 24 CDC channels]] | ||
|} | |} |
Latest revision as of 14:46, 25 April 2013
Monster signals
50/50 Ar/CO2 2200V (rare)
50/50 Ar/CO2 2200V (rare, 2 in 2k triggers)
Noise
50/50 Ar/CO2 2100V (few % events)
50/50 Ar/CO2 2200V (few % events)
Big bad noisy run (32099) 50/50 Ar/CO2 2100V
Possible clues from an earlier run
ch0:attenuated coincidence signal, ch1: attenuated discriminator signal from upper scint, ch2: atten discriminator signal from lower scint. Their shapes look a bit odd because of the flash's shaping.
NB apart from during the pulse itself, the logic signal level usually varies by less than +/- 1 adc unit