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| − | For the 12 GeV DVCS experiment, go to [[https://hallaweb.jlab.org/wiki/index.php/DVCS3 DVCS3 wiki ]]. | + | For the 12 GeV DVCS experiment, go to [[https://hallaweb.jlab.org/wiki/index.php/DVCS3 DVCS3 wiki ]]. <br> |
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| − | Assume:
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| − | <ul>
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| − | <li>longitudinally polarized beam
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| − | <li>max 20 uA but for short times when it can go higher
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| − | <li>7.3 GeV-4 pass and 5.5GeV-3Pass and possibly 9.10 GeV-5Pass later on
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| − | </ul>
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| − | == Commissioning/ Calibration ==
| + | For the Fall of 2016 (FY2017), we plan on taking the kinematics 36_2, 36_3 and as many of the 60_* ones as we can. |
| − | === Beam instruments ===
| + | |
| − | ==== BPM/Raster checks/Beam centering ====
| + | |
| − | <ol>
| + | |
| − | <li> Send unrastered beam to the four corners of a 2*2 mm square around assumed (0,0) position (as defined by RAD reading in beam dump). At each position compare harps against BPMs reading.
| + | |
| − | <li> ''JR: How to decide on beam centering beyond the RAD readings in the beam dump? Do we need to even go further than that?''
| + | |
| − | <li>Check size raster using the spot++ tool. Pending target boiling studies result, we will use a 2*2 mm raster.<br>
| + | |
| − | '' JR: Is it a matter to ask MCC for a 2*2 mm raster or does the info needs to go to them in a more "native" unit. Do we have a choice of frequency?'' | + | |
| − | </ol>
| + | |
| | | | |
| − | ==== BCMs====
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| − | Use the procedure that is under .....<br>
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| − | Need: To insure that minimal beam lost in the machine can be measured, beam that would go up to about 100 uA. We also need to be the only hall receiving beam.<br>
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| − | ''JR: Do we want to calibrate against the Unser monitor? Is the Unser operational? Do we know its calibration constant''
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| | | | |
| − | ==== Moeller ====
| + | [[Image:Fall2016.jpg | 1200px]] |
| − | The proposal goal calls for ΔP/P=1%.<br>
| + | |
| − | ''JR: How often do we want to measure the polarization? ''
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| | | | |
| − | ==== Compton ====
| + | [[Fall 2016 optic plans]] |
| − | At this time, we are hoping to be able to use the Compton asa beam quality monitor.
| + | |
| | | | |
| − | === Luminosity ===
| + | [[Fall 2016 calorimeter calibration (elastic)]] |
| − | ====Target Boiling ====
| + | |
| − | Check that the Carbon target doesn't boil. In similar conditions check if th hydrogen target does boil.
| + | |
| | | | |
| − | ====Deadtime check ====
| + | <hr> |
| − | The plan is to have multiple trigger that would let us check the deadtime. The cabling of these is yet to be defined.<br>
| + | <hr> |
| − | | + | <hr> |
| − | === HRS ===
| + | <hr> |
| − | ===Measure efficiencies S2m, Cerenkov and wire chamber ===
| + | |
| − | | + | |
| − | === Calorimeter ===
| + | |
| − | ==== DC readings ====
| + | |
| − | === Elastic Calibration ===
| + | |
| − | | + | |
| − | ==Main DVCS kinematics==
| + | |
