Procedure without Sieve-slit
* Take a run at the following kinematics without the sieve-slit collimator on the multi-foil carbon target.
* Start with initial right HRS spectrometer tune with the SOS 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.
* Rates assume 5 carbon foils, 6 mSr acceptance, and 9% 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 300k events at 20 μA |
| 3.8 |
1.002 |
33.0 |
1.23 |
2.214 |
316 |
16 |
Procedure with Sieve-slit
* Trained personnel will be required to install the 1-inch lead sieve-slit collimator onto the front face of the HRS.
* Take a sieve slit run with the multi-foil carbon target for the inelastic kinematics in the table.
* If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure.
* Repeat the above with the beam position shifted so that you see a vertical shift by one row.
* Rates assume 5 carbon foils, only 25 out of 63 sieve holes have events (~ 0.265 mSr acceptance), and 9% delta acceptance.
* Note: if the right HRS minimum angle is 35 degrees instead of 33 degrees, then the rate will be ~ 50 Hz instead.
| Ebeam [GeV] |
P0 [GeV/c] |
θe [deg] |
Q2 [GeV2] |
W [GeV] |
Rate [Hz] at 20 μA |
minutes for 90k events at 20 μA |
| 3.8 |
1.002 |
33.0 |
1.23 |
2.214 |
17 |
90 |
Delta Scan with Hydrogen Elastic
* Trained personnel will be required to remove the 1-inch lead sieve-slit collimator onto the front face of the HRS.
* Take a run with the 15 cm liquid hydrogen target for the elastic kinematics in the table.
* There will be a time lapse between settings until the right dipole reaches the desired momentum and is stable.
* If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure.
| Ebeam (GeV) |
k' (GeV) |
θe (deg) |
ΔP (%) |
Rate [Hz] at 20 μA |
minutes for 10k events at 20 μA |
| 3.8 |
2.39025 |
33.0 |
-4 |
6 |
30 |
| 3.8 |
2.34429 |
33.0 |
-2 |
6 |
30 |
| 3.8 |
2.29832 |
33.0 |
0 |
6 |
30 |
| 3.8 |
2.25235 |
33.0 |
+2 |
6 |
30 |
| 3.8 |
2.20639 |
33.0 |
+4 |
6 |
30 |
Elastic from Hydrogen
* If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure.
* Elastic electron-proton measurement. Assuming a 15 cm LH2 target, a spectrometer acceptance of 5 msr and elastic from Eric's rate program
to compute the cross-section.
| Ebeam (GeV) |
e' (GeV) |
θe (deg) |
Q2 (GeV2) |
Rate [Hz] at 20 μA |
minutes for 20.6k events at 20 μA |
| 3.8 |
2.29832 |
33.0 |
2.82 |
6 |
60 |
| 2.056 |
1.706 |
25.0 |
|
|
|
| 2.056 |
1.192 |
48.7 |
|
|
|
