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

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(Proton Elastic Kinematics)
(Proton Elastic Kinematics)
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     <td>53.25</td>
 
     <td>53.25</td>
 
     <td>12.54</td>
 
     <td>12.54</td>
     <td>0.018</td>
+
     <td>0.011</td>
     <td>19 (for 29k events)</td>
+
     <td>19 (for 17.4k events)</td>
 
   </tr>
 
   </tr>
 
   <tr>
 
   <tr>
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     <td>53.25</td>
 
     <td>53.25</td>
 
     <td>16.33</td>
 
     <td>16.33</td>
     <td>0.003</td>
+
     <td>0.002<td>
     <td>22 (for 5.7k events)</td>
+
     <td>22 (for 3.6k events)</td>
 
   </tr>
 
   </tr>
 
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Revision as of 16:16, 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 0.011 19 (for 17.4k events)
15 cm Dummy 2 x 2 mm2 8.517 1.815 53.25 12.54 ---- 1 hour
Single Carbon Off 8.517 0.85 53.25 5.81 0.83 1 hour (for 3k events)


  • 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 1.896 53.25 16.33 0.002 22 (for 3.6k events)
15 cm Dummy 2 x 2 mm2 10.617 1.896 53.25 16.33 ---- 1 hour
Single Carbon Off 10.617 0.85 53.25 7.24 0.69 1 hour (for 2.5k events)