CDC prototype fADC data
Data from cosmics with 50/50 gas, 2100V
Fit attempt 1
Use pedestal before peak, max peak amplitude, end of peak. Function fitted to many events for range end-of-peak to final sample was
pedestal + 0.14 * maxamp * exp(-0.0056*(x-endpeak))
where x=sample number; maxamp= maximum peak value; endpeak=sample number of 2 samples after the last sample where ADC value is at least 20 less than the previous sample; pedestal=mean of 100 samples before the peak starts (the peak starts at the sample where the adc value exceeds pedestal mean + 5 x pedestal standard deviation for samples 0-100). The constants were the mean values of the fitted function parameters.
Fit attempt 2
Use pedestal before peak, end of peak, integrated peak. Function fitted to many events for range end-of-peak to final sample was
pedestal + 0.0074 * integratedpeak * exp(-0.0056*(x-endpeak))
where x=sample number; pedestal=mean of 100 samples before the start of the peak; integrated peak=integration from start of peak to end of peak. The constants were the mean values of the fitted function parameters.
Fit attempt 3
Use pedestal before peak, end of peak, integrated peak as for attempt 2 but use spot pedestal value instead of mean. Function fitted to many events for range end-of-peak to final sample was
pedestal + 0.0072 * integratedpeak * exp(-0.00568*(x-endpeak))
where x=sample number; pedestal=adc value 3 samples before the start of the peak; integrated peak=integration from start of peak to end of peak. The constants were the mean values of the fitted function parameters.
