Parasitic Production Run Plan R-HRS 48.75 degrees

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Proton Elastic Kinematics

* If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure.
* Elastic electron rates assume 20 μA on 15 cm LH2 target, 5 mSr acceptance.
* Use the following prescale factors: ps1=1, ps2=1, ps3=1, ps8=100. All other triggers should have zero prescale factor.
* For the optics pointing run, decrease the spectrometer momentum to 0.85 GeV/c.  The right dipole will need about 1.5 hours to settle.
* Take one hour on the optics target.
* After the optics run is completed, then increase the spectrometer momentum back to the elastic setting.  
Make sure to cycle the right Q2 and Q3 when increasing the momentum. * The 15 cm dummy runs need to be taken at the elastic setting. So keep the momentum as is for this run. * A GMp expert will check the data quality.


  • 5th Pass (Ebeam = 11.0 GeV) Time estimate: 39 days @ 20 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 20 μA PAC days at 20 μA
15 cm LH2 2 x 2 mm2 11.021 2.204 48.74 16.54 0.003 38 (for 10k events)
Optics Off 11.021 0.85 48.74 6.38 4.4 1 hour (for 16k events)
15 cm Dummy 2 x 2 mm2 11.021 2.204 48.74 16.54 ---- 1 hour


  • 4th Pass (Ebeam = 8.8 GeV) Time estimate: 22 days @ 20 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 20 μA PAC days at 20 μA
15 cm LH2 2 x 2 mm2 8.841 2.101 48.74 12.65 0.018 21 (for 32k events)
Optics Off 8.841 0.85 48.74 5.12 4.9 1 hour (for 17k events)
15 cm Dummy 2 x 2 mm2 8.841 2.101 48.74 12.65 ---- 1 hour