Difference between revisions of "Dead time calculation"
From Hall A Wiki
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| + | == What is deadtime, and how to correct for it offline == | ||
| + | [http://hallaweb.jlab.org/equipment/daq/dtime.html Bob Michael's notes] | ||
| + | |||
| + | [http://www.jlab.org/primex/documents/2001_12_11/Primex_daq_rate.html PrimEx Discussion (Dave Lawrence)] | ||
Latest revision as of 18:06, 18 November 2010
The dead time is computed in end of run script
and in the ~a-onl/scaler/dtime scdtime.c for online dead time calculation
I put this formula in the deadtime calculation
- Dead time calculation
- Correlation between trigger ( April 6 2007 ) A. Camsonne
- T1 =S1S2
- T2 =S1 or S2 all T1 are are in T2
- T3 =S1S2
- T4 =S1C or S2C
- T5 = T1T3 all T5 are T1 and T3
- T6 = T3T2 all T6 are T3 and T2
- T7 = T1T4 all T7 are T1 and T4
- evert T7 is s T1
- Expected number of triggers = (T1-T5-T7)/ps1+(T2-2T1-T6)/ps2+(T3-T5-T6)/ps3+(T4-T7)/ps4+T5/ps5+T6/ps6+T7/ps7+T8/ps8
foreach t $scalerinfo(triglist) {
set tcorr 0
set nt($t,$h) $map(trigger-$t,$h)
if { $t == 1 } {
set tcorr $t5corr+$t7corr
}
if { $t == 2 } {
set tcorr $t6corr+2*$t1corr
}
if { $t == 3 } {
set tcorr [ expr $t5corr + $t6corr ] } if { $t == 4 } {
set tcorr [ expr $t7corr ]
}
