Run Plan (DVCS3)

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

1. 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.
2. JR: How to decide on beam centering beyond the RAD readings in the beam dump? Do we need to even go further than that?
3. 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

For no w