Difference between revisions of "CLAS12 r4139"
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| + | ;Discriminator threshold = 30 mV | ||
[[File:r4139_TDCtimeAllChan.png| 200 px]] | [[File:r4139_TDCtimeAllChan.png| 200 px]] | ||
| + | [[File:r4139_WireTimeDiff.png| 200 px]] | ||
if((evt_TDC1190[107]-evt_TDC1190[106]>-600) && (evt_TDC1190[107]-evt_TDC1190[106])<-250 && abs(evt_TDC1190[104]-evt_TDC1190[106])<300) | if((evt_TDC1190[107]-evt_TDC1190[106]>-600) && (evt_TDC1190[107]-evt_TDC1190[106])<-250 && abs(evt_TDC1190[104]-evt_TDC1190[106])<300) | ||
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[[File:r4139_TDCtimeAllChanCuts.png| 200 px]] | [[File:r4139_TDCtimeAllChanCuts.png| 200 px]] | ||
| + | [[File:r4139_Occupancy.png| 200 px]] | ||
| + | [[File:r4139_WireTimeDiffCuts.png| 200 px]] | ||
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| − | + | =Drift time= | |
| + | |||
| + | <math>t_{drift} = t_{start} - t_0 -t_{TDC}-t_{flight}-t_{prop} - t_{walk}</math> | ||
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| + | |||
| + | <math>t_{start}</math> =event start time | ||
| + | |||
| + | <math> t_0</math> =fixed time delay for the wire | ||
| + | <math>t_{TDC}</math>=raw TDC time measurement (time is subtracted because TDCs are in common stop mode) | ||
| − | + | <math>t_{flight}</math>=particles flight time from reaction vertex to the wire | |
| − | + | <math>t_{prop}</math> =signal propagation time along the wire | |
| + | <math>t_{walk}</math>=time-walk correction for short drift times due to different ionizations for slow and fast particles | ||
[[CLAS12_R1_S1_QA#Runlist_Disc.3D30_mv]] | [[CLAS12_R1_S1_QA#Runlist_Disc.3D30_mv]] | ||
Latest revision as of 14:29, 29 May 2013
- Discriminator threshold = 30 mV
if((evt_TDC1190[107]-evt_TDC1190[106]>-600) && (evt_TDC1190[107]-evt_TDC1190[106])<-250 && abs(evt_TDC1190[104]-evt_TDC1190[106])<300)
Drift time
=event start time
=fixed time delay for the wire
=raw TDC time measurement (time is subtracted because TDCs are in common stop mode)
=particles flight time from reaction vertex to the wire
=signal propagation time along the wire
=time-walk correction for short drift times due to different ionizations for slow and fast particles