Difference between revisions of "Right Quad Tuning 2pass 48d"
From Hall A Wiki
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==== Procedure without Sieve-slit ==== | ==== Procedure without Sieve-slit ==== | ||
* <b>Kinematics need to be updated!</b> | * <b>Kinematics need to be updated!</b> | ||
| − | * Time estimate: 2 hours | + | * Time estimate: 1-2 hours |
* Take a run at the following kinematics without the sieve-slit collimator. | * Take a run at the following kinematics without the sieve-slit collimator. | ||
Revision as of 21:48, 29 September 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 right HRS spectrometer tune with the new quad in place of right Q1. * If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure. * Electron rates assume 11 carbon foils, 5 mSr acceptance, and 8% delta acceptance. * A GMp expert will check the data quality and decide, if the right HRS tune needs to be adjusted to change the size of the acceptance. * This process will be repeated until the spectrometer tune is satisfactory.
| Ebeam [GeV] | P0 [GeV/c] | θe [deg] | Q2 [GeV2] | W [GeV] | Rate [Hz] at 20 μA | minutes for 87k events at 20 μA |
| 2.217 | 0.85 | 48.75 | 1.28 | 1.47 | 145 | 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
