Difference between revisions of "CDC prototype fADC data"

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[[Image:run_31716_maxamp20.png|thumb|400px|Histogram of first max in amplitude exceeding pedestal + 5 sigma ]]
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[[Image:run_31716_maxamp20.png|thumb|300px|Histogram of first max in amplitude exceeding pedestal + 5 sigma ]]
 
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Fit attempt 1<br/>
 
Fit attempt 1<br/>
−
Use pedestal before peak, max peak amplitude, end of peak - this is the first sample with contents > 20 less than its neighbor, starting with the last sample and working forwards. Function fitted to many events for range end-of-peak to final sample  was pedestal + 0.14 * maxamp * exp(-0.0056*(x-endpeak))
+
Use pedestal before peak, max peak amplitude, end of peak. Function fitted to many events for range end-of-peak to final sample  was <br/>
 +
pedestal + 0.14 * maxamp * exp(-0.0056*(x-endpeak)) <br/>
 +
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. 
  
 
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Fit attempt 2<br/>
 +
Use pedestal before peak, end of peak, integrated peak. Function fitted to many events for range end-of-peak to final sample  was
 +
<br/>
 +
pedestal + 0.0074 * integratedpeak * exp(-0.0056*(x-endpeak)) <br/>
 +
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. 
 +
 
 +
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[[Image:int167.png|thumb|300px]]
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|width="300pt"|
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[[Image:int266.png|thumb|300px]]
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|width="300pt"|
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[[Image:int428.png|thumb|300px]]
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|width="300pt"|
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[[Image:int334.png|thumb|300px]]
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[[Image:int2411.png|thumb|300px]]
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|width="300pt"|
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[[Image:int704.png|thumb|300px]]
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|}
 +
 
 +
Fit attempt 3<br/>
 +
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
 +
<br/>
 +
pedestal + 0.0072 * integratedpeak * exp(-0.00568*(x-endpeak)) <br/>
 +
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. 
 +
 
 +
{| border="0" cellpadding="2"
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|width="800pt"|
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[[Image:1exp-int2.png|thumb|800px ]]
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{| border="0" cellpadding="2"
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|width="300pt"|
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[[Image:int2fit133.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit147.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit167.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit266.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit428.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit334.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit2411.png|thumb|300px]]
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|width="300pt"|
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[[Image:int2fit704.png|thumb|300px]]
 
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Latest revision as of 14:11, 28 October 2011

Data from cosmics with 50/50 gas, 2100V

Event133.png
Event147.png
Event167.png
Event266.png
Event428.png
Event334.png
Event2411.png
Event704.png
Histogram of first max in amplitude exceeding pedestal + 5 sigma

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.

1exp.png
Fit133.png
Fit147.png
Fit167.png
Fit266.png
Fit428.png
Fit334.png
Fit2411.png
Fit704.png

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.

1exp-int.png
Int133.png
Int147.png
Int167.png
Int266.png
Int428.png
Int334.png
Int2411.png
Int704.png

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.

1exp-int2.png
Int2fit133.png
Int2fit147.png
Int2fit167.png
Int2fit266.png
Int2fit428.png
Int2fit334.png
Int2fit2411.png
Int2fit704.png
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