Winter 2016 calorimeter calibration (elastic)
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Back to [Winter2016 DVCS run plan]
Need to remove the plastic shield.
Calorimeter-Target distance =6.2m
LH2 target, unrastered beam (which means beam current at less than 5 uA).
LHRS in positive polarity.
Open LHRS collimator
DAQ: DVCS config, trigger is S0+S2, autovalidation.
angleLHRS= 38.04 [deg]
momentum LHRS= 2.127 GeV
beam energy= 4.5 GeV
We will take about 1 hour beam with three calorimeter angles: 26.5, 25 and 23.5 deg.
We are going to move the calorimeter and leave the HRS fixed but we could have done the contrary (see table below).
| pHRS [GeV]=2.217 | angleLHRS [deg]=36.80 | minutes to 500 evts per blocs at 10uA=12 | kp [GeV]=3.0 | Q2=2.7585 |
| pHRS [GeV]=2.127 | angleLHRS [deg]=38.04 | minutes to 500 evts per blocs at 10uA=9 | kp [GeV]=3.1 | Q2=2.603 |
| pHRS [GeV]=2.046 | angleLHRS [deg]=39.18 | minutes to 500 evts per blocs at 10uA=6. | kp [GeV]=3.2 | Q2=2.464 |
