Difference between revisions of "Winter 2016 calorimeter calibration (elastic)"
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| − | [[Image:Elastic_kinematic_4.5.jpg| | + | Need to remove the plastic shield. <br> |
| + | Calorimeter-Target distance =6.2m<br> | ||
| + | LH2 target, unrastered beam (which means beam current at less than 5 uA). <br> | ||
| + | LHRS in positive polarity.<br> | ||
| + | Open LHRS collimator<br> | ||
| + | DAQ: DVCS config, trigger is S0+S2, autovalidation.<br> | ||
| + | angle<SUB>LHRS</SUB>= 38.04 [deg]<br> | ||
| + | momentum<SUB> LHRS</SUB>= 2.127 GeV<br> | ||
| + | beam energy= 4.5 GeV<br> | ||
| + | |||
| + | We will take about 1 hour beam with three calorimeter angles: 26.5, 25 and 23.5 deg. | ||
| + | |||
| + | |||
| + | |||
| + | [[Image:Elastic_kinematic_4.5.jpg| 1000px]] | ||
| + | |||
| + | |||
| + | [[Image:Kine_elast_versus_e_angle.jpg| 1000 px]] | ||
| + | |||
| + | |||
| + | We are going to move the calorimeter and leave the HRS fixed but we could have done the contrary (see table below). | ||
| + | |||
| + | |||
| + | <table border="1" style="width:90%"> | ||
| + | <tr> | ||
| + | <td> p<SUB>HRS</SUB> [GeV]=2.217</td> | ||
| + | <td> angle<SUB>LHRS</SUB> [deg]=36.80</td> | ||
| + | <td> minutes to 500 evts per blocs at 10uA=12</td> | ||
| + | <td> kp [GeV]=3.0</td> | ||
| + | <td> Q<SUP>2</SUP>=2.7585</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td> p<SUB>HRS</SUB> [GeV]=2.127</td> | ||
| + | <td> angle<SUB>LHRS</SUB> [deg]=38.04</td> | ||
| + | <td> minutes to 500 evts per blocs at 10uA=9</td> | ||
| + | <td> kp [GeV]=3.1</td> | ||
| + | <td> Q<SUP>2</SUP>=2.603</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td> p<SUB>HRS</SUB> [GeV]=2.046</td> | ||
| + | <td> angle<SUB>LHRS</SUB> [deg]=39.18</td> | ||
| + | <td> minutes to 500 evts per blocs at 10uA=6.</td> | ||
| + | <td> kp [GeV]=3.2</td> | ||
| + | <td> Q<SUP>2</SUP>=2.464</td> | ||
| + | </tr> | ||
| + | </table> | ||
Latest revision as of 11:07, 13 February 2016
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 |
