Difference between revisions of "Spectrometer Optics First pass 48p75d"
From Hall A Wiki
(→Integration with LHRS plan) |
(→Step R5: Procedure without Sieve-slit) |
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<td>L1 (sieve)</td> | <td>L1 (sieve)</td> | ||
<td>R1 (sieve)</td> | <td>R1 (sieve)</td> | ||
| − | <td> | + | <td> 3h </td> |
<td> 60 uA DIS with sieve slit on optics foils and LH2</td> | <td> 60 uA DIS with sieve slit on optics foils and LH2</td> | ||
| − | <td><b></b></td> | + | <td><b>L1 Completed</b><br>R1 in progress</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 25: | Line 25: | ||
<td> 1-2h </td> | <td> 1-2h </td> | ||
<td> Elastic Delta Scan on LH2, 10 uA</td> | <td> Elastic Delta Scan on LH2, 10 uA</td> | ||
| − | <td><b></b></td> | + | <td><b>Completed</b></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 32: | Line 32: | ||
<td> 3-4h </td> | <td> 3-4h </td> | ||
<td> Elastic Delta Scan on LH2, 60 uA</td> | <td> Elastic Delta Scan on LH2, 60 uA</td> | ||
| − | <td> </td> | + | <td><b>Completed</b> </td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 39: | Line 39: | ||
<td> 1h </td> | <td> 1h </td> | ||
<td> Elastic dummy </td> | <td> Elastic dummy </td> | ||
| − | <td> | + | <td><b>R3 completed</b><br>L3 skipped</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 45: | Line 45: | ||
<td> R4 (no sieve)</td> | <td> R4 (no sieve)</td> | ||
<td> 1h </td> | <td> 1h </td> | ||
| − | <td> LHRS: elastic LH2<br> | + | <td> LHRS: elastic LH2, 60 uA<br> |
| − | RHRS: DIS on single carbon and optics </td> | + | RHRS: DIS on single carbon and optics, 60 uA</td> |
| − | <td></td> | + | <td><b>R4 Completed</b><br>L4 not started</td> |
</tr> | </tr> | ||
| Line 56: | Line 56: | ||
==== Step R1: Procedure with Sieve-slit ==== | ==== Step R1: Procedure with Sieve-slit ==== | ||
| − | * Time estimate: | + | * 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. | * Trained personnel will be required to install the 1-inch tungsten sieve-slit collimator onto the front face of the HRS. | ||
| Line 69: | Line 69: | ||
<td>E<SUB>beam</SUB> [GeV]</td> | <td>E<SUB>beam</SUB> [GeV]</td> | ||
<td>P<sub>0</sub> [GeV/c]</td> | <td>P<sub>0</sub> [GeV/c]</td> | ||
| + | <td>RQ1</td> | ||
<td>Raster</td> | <td>Raster</td> | ||
<td>θ<SUB>e</SUB> [deg]</td> | <td>θ<SUB>e</SUB> [deg]</td> | ||
| Line 81: | Line 82: | ||
<td>2.217</td> | <td>2.217</td> | ||
<td>1.0</td> | <td>1.0</td> | ||
| + | <td>200.41</td> | ||
<td><b>Off</b></td> | <td><b>Off</b></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
| Line 93: | Line 95: | ||
<td>2.217</td> | <td>2.217</td> | ||
<td>1.0</td> | <td>1.0</td> | ||
| − | <td> | + | <td>200.41</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>1.51</td> | <td>1.51</td> | ||
| Line 117: | Line 120: | ||
<tr> | <tr> | ||
<td>E<SUB>beam</SUB> (GeV)</td> | <td>E<SUB>beam</SUB> (GeV)</td> | ||
| − | <td>k' (GeV)</td> | + | <td>k' (GeV)</td> |
| + | <td>RQ1</td> | ||
<td>Raster</td> | <td>Raster</td> | ||
<td>θ<SUB>e</SUB> (deg)</td> | <td>θ<SUB>e</SUB> (deg)</td> | ||
| Line 128: | Line 132: | ||
<td>2.217</td> | <td>2.217</td> | ||
<td>1.277</td> | <td>1.277</td> | ||
| − | <td> | + | <td>255.93</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>-4</td> | <td>-4</td> | ||
| Line 137: | Line 142: | ||
<tr> | <tr> | ||
<td>2.217</td> | <td>2.217</td> | ||
| − | <td>1.253</td> | + | <td>1.253</td> |
| − | <td> | + | <td>251.11</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>-2</td> | <td>-2</td> | ||
| Line 147: | Line 153: | ||
<tr> | <tr> | ||
<td>2.217</td> | <td>2.217</td> | ||
| − | <td>1.228</td> | + | <td>1.228</td> |
| − | <td> | + | <td>246.10</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>0</td> | <td>0</td> | ||
| Line 157: | Line 164: | ||
<tr> | <tr> | ||
<td>2.217</td> | <td>2.217</td> | ||
| − | <td>1.204</td> | + | <td>1.204</td> |
| − | <td> | + | <td>241.29</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>+2</td> | <td>+2</td> | ||
| Line 167: | Line 175: | ||
<tr> | <tr> | ||
<td>2.217</td> | <td>2.217</td> | ||
| − | <td>1.179</td> | + | <td>1.179</td> |
| − | <td> | + | <td>236.28</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>+4</td> | <td>+4</td> | ||
| Line 189: | Line 198: | ||
<td>E<SUB>beam</SUB> (GeV)</td> | <td>E<SUB>beam</SUB> (GeV)</td> | ||
<td>k' (GeV)</td> | <td>k' (GeV)</td> | ||
| + | <td>RQ1</td> | ||
<td>Raster</td> | <td>Raster</td> | ||
<td>θ<SUB>e</SUB> (deg)</td> | <td>θ<SUB>e</SUB> (deg)</td> | ||
| Line 198: | Line 208: | ||
<tr> | <tr> | ||
<td>2.217</td> | <td>2.217</td> | ||
| − | <td>1.228</td> | + | <td>1.228</td> |
| − | <td> | + | <td>246.10</td> |
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
<td>48.75</td> | <td>48.75</td> | ||
<td>0</td> | <td>0</td> | ||
| Line 236: | Line 247: | ||
<td>2.217</td> | <td>2.217</td> | ||
<td>1.0</td> | <td>1.0</td> | ||
| − | <td> | + | <td>200.41</td> |
<td>48.75</td> | <td>48.75</td> | ||
<td>1.51</td> | <td>1.51</td> | ||
| Line 248: | Line 259: | ||
<td>2.217</td> | <td>2.217</td> | ||
<td>1.0</td> | <td>1.0</td> | ||
| − | <td> | + | <td>200.41</td> |
<td>48.75</td> | <td>48.75</td> | ||
<td>1.51</td> | <td>1.51</td> | ||
| Line 258: | Line 269: | ||
</table> | </table> | ||
<br> | <br> | ||
| + | |||
| + | ==== Step R5: Procedure without Sieve-slit ==== | ||
| + | <table border="1" style="width:80%"> | ||
| + | <tr> | ||
| + | <td>Target</td> | ||
| + | <td>Raster</td> | ||
| + | <td>E<SUB>beam</SUB> [GeV]</td> | ||
| + | <td>P<sub>0</sub> [GeV/c]</td> | ||
| + | <td>Right Q1 Current [A]</td> | ||
| + | <td>θ<SUB>e</SUB> [deg]</td> | ||
| + | <td>Minutes</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td>15cm LH2</td> | ||
| + | <td>2 x 2 mm<sup>2</sup></td> | ||
| + | <td>2.217</td> | ||
| + | <td>1.204</td> | ||
| + | <td>241.29</td> | ||
| + | <td>48.75</td> | ||
| + | <td>Run parallel with LHRS optics step L4</td> | ||
| + | </tr> | ||
| + | </table> | ||
Latest revision as of 15:55, 17 October 2016
If you have questions call Vince Sulkosky or Kalyan Allada, Numbers are on white board
Contents
Integration with LHRS plan
| LHRS step | RHRS step | Approximate beam time | Goals | Status |
| L1 (sieve) | R1 (sieve) | 3h | 60 uA DIS with sieve slit on optics foils and LH2 | L1 Completed R1 in progress |
| L2 (sieve) | 1-2h | Elastic Delta Scan on LH2, 10 uA | Completed | |
| R2 (no sieve) | 3-4h | Elastic Delta Scan on LH2, 60 uA | Completed | |
| L3 (sieve) | R3 (no sieve) | 1h | Elastic dummy | R3 completed L3 skipped |
| L4 (no sieve) | R4 (no sieve) | 1h | LHRS: elastic LH2, 60 uA RHRS: DIS on single carbon and optics, 60 uA |
R4 Completed L4 not started |
Step R1: 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. * If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure. * Take sieve-slit runs with the multi-foil carbon target (optics) for the inelastic kinematics in the table. * Electron rates assume 9 carbon foils, only 37 out of 155 sieve holes per foil have events (~ 0.41 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] | RQ1 | Raster | θe [deg] | Q2 [GeV2] | W [GeV] | Rate [Hz] at 60 μA | hours at 60 μA | Good Electrons |
| Optics | 2.217 | 1.0 | 200.41 | Off | 48.75 | 1.51 | 1.287 | 14 | 2 | 100k events |
| 15 cm LH2 | 2.217 | 1.0 | 200.41 | 2 x 2 mm2 | 48.75 | 1.51 | 1.287 | 40.0 | 1.0 | 144k events |
Step R2: Delta Scan with Proton Elastic (without sieve slit)
- Time estimate: 3-4 hours
* Trained personnel will be required to remove the 1-inch tungsten sieve-slit collimator from the front face of the HRS. * Take runs with the 15 cm liquid hydrogen target for the elastic kinematics in the table. * There will be about a 40 minute 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 1.86 GeV2.
| Ebeam (GeV) | k' (GeV) | RQ1 | Raster | θe (deg) | ΔP (%) | Rate [Hz] at 60 μA | minutes at 60 μA | Good Electrons |
| 2.217 | 1.277 | 255.93 | 2 x 2 mm2 | 48.75 | -4 | 650 | 10 | 390k events |
| 2.217 | 1.253 | 251.11 | 2 x 2 mm2 | 48.75 | -2 | 650 | 10 | 390k events |
| 2.217 | 1.228 | 246.10 | 2 x 2 mm2 | 48.75 | 0 | 650 | 20 | 780k events |
| 2.217 | 1.204 | 241.29 | 2 x 2 mm2 | 48.75 | +2 | 650 | 10 | 390k events |
| 2.217 | 1.179 | 236.28 | 2 x 2 mm2 | 48.75 | +4 | 650 | 10 | 390k events |
Step R3: Dummy Target Runs
- Go back to the ΔP = 0% elastic setting. Make sure the R-HRS P0 = 1.228 GeV.
- Move the target to "15 cm Dummy"
- Take R-HRS run with same setting as previous step.
- Take data with this setting for 1 hour
| Ebeam (GeV) | k' (GeV) | RQ1 | Raster | θe (deg) | ΔP (%) | Rate [Hz] at 40 μA | hours at 40 μA | Good Electrons |
| 2.217 | 1.228 | 246.10 | 2 x 2 mm2 | 48.75 | 0 | 19.5 | 1 | 70k events |
Step R4: Procedure without Sieve-slit
- Time estimate: 1 hour
* Take a run at the following kinematics without the sieve-slit collimator. * If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure. * Electron rates assume 9 carbon foils or 1 single carbon foil, 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 60 μA | minutes at 60 μA | Good Electrons |
| Optics | 2.217 | 1.0 | 200.41 | 48.75 | 1.51 | 1.287 | 250 | 15 | 220k events |
| Single Carbon | 2.217 | 1.0 | 200.41 | 48.75 | 1.51 | 1.287 | 56 | 15 | 50k events |
Step R5: Procedure without Sieve-slit
| Target | Raster | Ebeam [GeV] | P0 [GeV/c] | Right Q1 Current [A] | θe [deg] | Minutes |
| 15cm LH2 | 2 x 2 mm2 | 2.217 | 1.204 | 241.29 | 48.75 | Run parallel with LHRS optics step L4 |
