Difference between revisions of "Quad Tuning 1pass 48d"
From Hall A Wiki
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(→Procedure without Sieve-slit) |
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* If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure. | * If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure. | ||
* Electron rates assume 9 out of 11 carbon foils, 5 mSr acceptance, and 8% delta acceptance. | * Electron rates assume 9 out of 11 carbon foils, 5 mSr acceptance, and 8% delta acceptance. | ||
| − | * <b>A GMp expert will check the data quality and decide, if the | + | * <b>A GMp expert will check the data quality and decide, if the HRS tunes need to be adjusted to change the size of the acceptance.</b> |
* This process will be repeated until the spectrometer tune is satisfactory.<br> | * This process will be repeated until the spectrometer tune is satisfactory.<br> | ||
| Line 24: | Line 24: | ||
<td>2.217</td> | <td>2.217</td> | ||
<td>0.85</td> | <td>0.85</td> | ||
| − | <td> | + | <td>17.5</td> |
<td>1.28</td> | <td>1.28</td> | ||
<td>1.47</td> | <td>1.47</td> | ||
Revision as of 13:01, 8 October 2016
Procedure without Sieve-slit
- Kinematics need to be updated!
- Time estimate: 1-2 hours
* Take a run at the following kinematics without the sieve-slit collimator. * Start with initial HRS spectrometer tunes for the left and right arms with the new quads in place of Q1s. * If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure. * Electron rates assume 9 out of 11 carbon foils, 5 mSr acceptance, and 8% delta acceptance. * A GMp expert will check the data quality and decide, if the HRS tunes need to be adjusted to change the size of the acceptance. * This process will be repeated until the spectrometer tune is satisfactory.
- Left-HRS Kinematics: 1st Pass (Ebeam = 2.2 GeV)
| Ebeam [GeV] | P0 [GeV/c] | θe [deg] | Q2 [GeV2] | W [GeV] | Rate [Hz] at 20 μA | minutes for 71k events at 20 μA |
| 2.217 | 0.85 | 17.5 | 1.28 | 1.47 | 119 | 10 |
We want to take runs with the following Q1 currents:
- 0%: 159.75 A
- -6%: 150.165 A
- -5%: 151.7625 A
- -4%: 153.36 A
- -3%: 154.9575 A
- +5%: 167.7375 A
- Right-HRS Kinematics: 1st Pass (Ebeam = 2.2 GeV)
| Ebeam [GeV] | P0 [GeV/c] | θe [deg] | Q2 [GeV2] | W [GeV] | Rate [Hz] at 20 μA | minutes for 71k events at 20 μA |
| 2.217 | 0.85 | 48.75 | 1.28 | 1.47 | 119 | 10 |
We want to take runs with the following Q1 currents:
- 0%: 159.75 A
- -6%: 150.165 A
- -5%: 151.7625 A
- -4%: 153.36 A
- -3%: 154.9575 A
- +5%: 167.7375 A
