View source for Spectrometer Optics 1pass

==== Procedure without Sieve-slit ====
* Time estimate: 4 hours

 * 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.
 * Rates assume 5 carbon foils, 5 mSr acceptance, and 8% delta acceptance.
 * <b>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.</b>
 * This process will be repeated until the spectrometer tune is satisfactory.<br>

<table border="1"  style="width:80%">
  <tr>	
    <td>E<SUB>beam</SUB> [GeV]</td>	
    <td>P<sub>0</sub> [GeV/c]</td>	
    <td>&theta;<SUB>e</SUB> [deg]</td>	
    <td>Q<SUP>2</SUP> [GeV<SUP>2</SUP>]</td>	
    <td>W [GeV]</td>	
    <td> Rate [Hz] at 20 &mu;A</td>
    <td> minutes for 235k events at 20 &mu;A</td>
  </tr>	
  <tr>	
    <td>1.9</td>	
    <td>0.75</td>	
    <td>43.7</td>	
    <td>0.79</td>	
    <td>1.500</td>	
    <td>197</td>	
    <td>20</td>	
  </tr>	
</table>

==== Procedure with Sieve-slit ====
* Time estimate: 3 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.
 * 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 8% delta acceptance.
<table border="1"  style="width:80%">
  <tr>
    <td>E<SUB>beam</SUB> [GeV]</td>
    <td>P<sub>0</sub> [GeV/c]</td> 
    <td>&theta;<SUB>e</SUB> [deg]</td>
    <td>Q<SUP>2</SUP> [GeV<SUP>2</SUP>]</td>
    <td>W [GeV]</td>
    <td> Rate [Hz] at 20 &mu;A</td>
    <td> minutes for 100k events at 20 &mu;A</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>0.75</td> 
    <td>43.7</td>
    <td>0.79</td>
    <td>1.500</td>
    <td>10</td>
    <td>160</td>
  </tr>
</table>

==== Delta Scan with Hydrogen Elastic ====
* Time estimate: 1-2 hours

 * 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.<br>

<table border="1"  style="width:80%">
  <tr>
    <td>E<SUB>beam</SUB> (GeV)</td>
    <td>k' (GeV)</td> 
    <td>&theta;<SUB>e</SUB> (deg)</td>
    <td>&Delta;P (%)</td>
    <td> Rate [Hz] at 20 &mu;A</td>
     <td> minutes for 10k events at 20 &mu;A</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>1.5478</td> 
    <td>43.7</td>
    <td>-4</td>
    <td>12</td>
    <td>14</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>1.518</td> 
    <td>43.7</td>
    <td>-2</td>
    <td>12</td>
    <td>14</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>1.4882</td> 
    <td>43.7</td>
    <td>0</td>
    <td>12</td>
    <td>14</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>1.4585</td> 
    <td>43.7</td>
    <td>+2</td>
    <td>12</td>
    <td>14</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>1.4287</td> 
    <td>43.7</td>
    <td>+4</td>
    <td>12</td>
    <td>14</td>
  </tr>
</table>

==== Elastic from Hydrogen ====
* Time estimate: 1-2 hours

 * 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 <br>
   to compute the cross-section.<br>
<table border="1"  style="width:80%">
  <tr>
    <td>E<SUB>beam</SUB> (GeV)</td>
    <td>k' (GeV)</td> 
    <td>&theta;<SUB>e</SUB> (deg)</td>
    <td>Q<SUP>2</SUP> (GeV<SUP>2</SUP>)</td>
    <td> Rate [Hz] at 20 &mu;A</td>
     <td> minutes for 40k events at 20 &mu;A</td>
  </tr>
  <tr>
    <td>1.9</td>
    <td>1.2172</td> 
    <td>43.7</td>
    <td>1.28</td>
    <td></td>
    <td></td>
  </tr>
</table>