Spectrometer Optics First pass 48p8d

Procedure without Sieve-slit

• Time estimate: 1 hour

* Take a run at the following kinematics without the sieve-slit collimator.
* 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.
* Electron rates assume 5 carbon foils or 2 Al dummy foils, 5 mSr acceptance, and 8% delta acceptance.
* A GMp expert will check the data quality.

Target	Ebeam [GeV]	P0 [GeV/c]	Right Q1 Current [A]	θe [deg]	Q2 [GeV2]	W [GeV]	Rate [Hz] at 20 μA	minutes for 50k events at 20 μA
Optics	2.301	0.75	153.36	48.74	1.18	1.617	70.5	12
4 cm Dummy	2.301	0.75	153.36	48.74	1.18	1.617	37.4	22

Procedure with Sieve-slit

• Time estimate: 11 hours

* Trained personnel will be required to install the 1-inch tungsten 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.
* Electron rates assume 5 carbon foils, only 37 out of 155 sieve holes per foil have events (~ 0.4 mSr acceptance), and 8% delta acceptance.
* Electron rates assume 2 aluminum foils, only 43 out of 155 sieve holes per foil have events (~ 0.47 mSr acceptance), and 8% delta acceptance.
* Electron rates assume 15 cm LH2 target, only 45 out of 155 sieve holes have events (~ 0.49 mSr acceptance), and 8% delta acceptance.
* Before moving on to the next target, a GMp expert will determine online how many good electron events have been collected. 

Target	Ebeam [GeV]	P0 [GeV/c]	Right Q1 Current [A]	θe [deg]	Q2 [GeV2]	W [GeV]	Rate [Hz] at 20 μA	hours at 20 μA
Optics	2.301	0.75	153.36	48.74	1.18	1.617	5.6	5 (for 100k events)
4 cm Dummy	2.301	0.75	153.36	48.74	1.18	1.617	3.5	4 (for 50k events)
15 cm LH2	2.301	0.75	153.36	48.74	1.18	1.617	20.0	1 (for 72k events)

• Wire Target

* After the above runs are completed, ask for the target group to insert the wire-target (we are not allowed to do it).
* Take a run with the wire target. 
*  A GMp expert will determine when enough good electron events have been collected.

Delta Scan with Proton Elastic

• Time estimate: 3 hours

* Trained personnel will be required to remove the 1-inch tungsten sieve-slit collimator from 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.
* Rate estimates only include elastic electrons and does not include rate from inelastic events or from the target endcaps. 
* The Q2 for these settings is 1.96 GeV2.

Ebeam (GeV)	k' (GeV)	Right Q1 Current [A]	θe (deg)	ΔP (%)	Rate [Hz] at 20 μA	minutes for 220k events at 20 μA
2.301	1.304	266.64	48.74	-4	176	21
2.301	1.279	261.53	48.74	-2	176	21
2.301	1.254	256.42	48.74	0	176	21
2.301	1.229	251.3	48.74	+2	176	21
2.301	1.203	245.99	48.74	+4	176	21

Proton Elastic Run and Dummy Target Runs

• Go back to the ΔP = 0% elastic setting. Make sure the R-HRS P0 = 1.254 GeV and Q1 current = 256.42 A.
• Take data with this setting for 1-2 hours

Ebeam (GeV)	k' (GeV)	θe (deg)	ΔP (%)	Rate [Hz] at 20 μA	minutes for 1M events at 20 μA
2.301	1.254	48.74	0	176	~ 105 mins

• Move the target to "Dummy"
• Take R-HRS run with same setting as previous step. We need at least 200 K events.