Difference between revisions of "Parasitic Production Run Plan R-HRS 48.75 degrees"

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(Proton Elastic Kinematics)
(Proton Elastic Kinematics)
Line 28: Line 28:
 
     <td>2 x 2  mm<sup>2</sup></td>
 
     <td>2 x 2  mm<sup>2</sup></td>
 
     <td>8.517</td>
 
     <td>8.517</td>
     <td>2.081</td>
+
     <td>1.815</td>
     <td>48.75</td>
+
     <td>53.25</td>
     <td>12.08</td>
+
     <td>12.54</td>
 
     <td>0.018</td>
 
     <td>0.018</td>
 
     <td>19 (for 29k events)</td>
 
     <td>19 (for 29k events)</td>
Line 39: Line 39:
 
     <td>8.517</td>
 
     <td>8.517</td>
 
     <td>0.85</td>
 
     <td>0.85</td>
     <td>48.75</td>
+
     <td>53.25</td>
 
     <td>4.93</td>
 
     <td>4.93</td>
 
     <td>6.9</td>
 
     <td>6.9</td>
Line 48: Line 48:
 
   <td>2 x 2  mm<sup>2</sup></td>
 
   <td>2 x 2  mm<sup>2</sup></td>
 
     <td>8.517</td>
 
     <td>8.517</td>
     <td>2.081</td>
+
     <td>1.815</td>
     <td>48.75</td>
+
     <td>53.25</td>
 
     <td>12.08</td>
 
     <td>12.08</td>
 
     <td>----</td>
 
     <td>----</td>

Revision as of 16:03, 29 October 2016

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 15 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.


  • 4th Pass (Ebeam = 8.5 GeV) Time estimate: 19 days @ 15 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 15 μA PAC days at 15 μA
15 cm LH2 2 x 2 mm2 8.517 1.815 53.25 12.54 0.018 19 (for 29k events)
Optics Off 8.517 0.85 53.25 4.93 6.9 1 hour (for 24k events)
15 cm Dummy 2 x 2 mm2 8.517 1.815 53.25 12.08 ---- 1 hour


  • 5th Pass (Ebeam = 10.6 GeV) Time estimate: 22 days @ 15 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 15 μA PAC days at 15 μA
15 cm LH2 2 x 2 mm2 10.617 2.187 48.75 15.82 0.003 22 (for 5.7k events)
Optics Off 10.617 0.85 48.75 6.15 6.0 1 hour (for 21k events)
15 cm Dummy 2 x 2 mm2 10.617 2.187 48.75 15.82 ---- 1 hour