Difference between revisions of "Run Plan (DVCS3)"
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Revision as of 11:17, 11 September 2014
For the 12 GeV DVCS experiment, go to [DVCS3 wiki ].
Assume:
- longitudinally polarized beam
- max 20 uA but for short times when it can go higher
- 7.3 GeV-4 pass and 5.5GeV-3Pass and possibly 9.10 GeV-5Pass later on
Commissioning/ Calibration
Beam instruments
BPM/Raster checks/Beam centering
- 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.
- JR: How to decide on beam centering beyond the RAD readings in the beam dump? Do we need to even go further than that?
- Check size raster using the spot++ tool. Pending target boiling studies result, we will use a 2*2 mm raster.
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?
BCMs
Use the procedure that is under .....
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.
JR: Do we want to calibrate against the Unser monitor? Is the Unser operational? Do we know its calibration constant
Moeller
The proposal goal calls for ΔP/P=1%.
JR: How often do we want to measure the polarization?
Compton
At this time, we are hoping to be able to use the Compton asa beam quality monitor.
Luminosity
Target Boiling
Check that the Carbon target doesn't boil. In similar conditions check if th hydrogen target does boil.
Deadtime check
The plan is to have multiple trigger that would let us check the deadtime. The cabling of these is yet to be defined.
