Difference between revisions of "Noise scan"
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- noise rate: hit_event divided by DAQ time. It is the rate of noise per strip. | - noise rate: hit_event divided by DAQ time. It is the rate of noise per strip. | ||
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| + | In the following plots it is possible to find an example for FEB 0. | ||
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| + | [[File:Rate strip tscan.pdf|thumb|Rate per strip at different values of T and E branch thresholds]] | ||
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| + | [[File:Occupancy tscan.pdf|thumb|Occupacy at different values of T and E branch thresholds]] | ||
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| + | ''' New thresholds''' | ||
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| + | A study with the new threshold setting is performed. Since GEMROC 0 FEB 2 is not properly calibrated, we have analysed GEMROC 4. Full detailed infomration can be found in the following file. | ||
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| + | [[File:New threshold rate scan.pdf|thumb|Noise scan information with new thresholds]] | ||
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| + | In the following plots it is possible to find an example for FEB 16. | ||
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| + | [[File:Occupancy tscan newTh.pdf|thumb|Occupancy with new threshold definition on GEMROC 4 FEB 16]] | ||
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| + | [[File:Ratestrip tscan newTh.pdf|thumb|Rate per strip with new threshold definition. ]] | ||
Latest revision as of 03:30, 7 June 2019
Using the information from the threshold scan it is possible to give an estimation of the noise, expressed both in occupancy (%) and in rate (Hz).
The following file contains the detailed information for all the investigated FEBs. FEB2 data are missing since it is not properly calibrated.
Some information on the variable used:
- noise: number of hits with charge > 2 fC and in a time window of -100 < t < 200 ns around the trigger time
- total: number of events in each run
- DAQ time: 300 ns time window times the number of events. It is the total time considered.
- hit_event: ratio between noise and total
- occupancy: hit_event divided by the number of channels (in the runs 63-87, 124 channels per each FEB) multiplied by 100.
- total noise: noise divided DAQ time
- noise rate: hit_event divided by DAQ time. It is the rate of noise per strip.
In the following plots it is possible to find an example for FEB 0.
New thresholds
A study with the new threshold setting is performed. Since GEMROC 0 FEB 2 is not properly calibrated, we have analysed GEMROC 4. Full detailed infomration can be found in the following file.
File:New threshold rate scan.pdf
In the following plots it is possible to find an example for FEB 16.
