[Halla_running] [New Logentry] RC update and run plan, 14 Oct

[pking at jlab.org]

Logentry Text:
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The hall is in beam permit, and beam restoration and harp scans are in progress.  Initial conditions are with the target field off, SBS off,  BigBite on.

Run plan
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1)  Beam restoration
2)  Harp scans at 1H01, 1H04A, 1H04B to check beam spot size.  Adjust beam spot size if needed
3)  Low current CW beam to check beam spot at the dump.
4)  Unrastered beam  5uA, on carbon hole target @ X=0.25, Y=-0.5, then go to +/- 0.5 mm in each of X and Y to verify rates are minimized at the nominal center
5)  Turn on raster, centering check on the carbon hole target , at +1mm in X from nominal center (X=1.25, Y=-0.5, if nothing has changed).  Check raster size as compared to the hole, check centering.
6)  Raster on, carbon hole target, with 5uA beam at nominal center.
7)  Turn raster off on the carbon hole target, take a run and note the rates, then turn the target field on and take a run and note the rates.
7B)  If the raster-off rates are the same, then centering is the same; if they are not, take another run on the carbon hole offset by +1mm in X to reevaluate centering
8)  Go to no target, and test the ramp rate protection.
9)  Move to carbon optics target at nominal center, with target field off.  Take a 5uA run to check raster uniformity
10)  Turn on the target field.  Take a run to verify target field doesn't impact raster uniformity.
11)  If not too late, take a run to do a bullseye scan on carbon optics target with unrastered beam and harp scans for positions at the +/- 2mm corners from the nominal center.  If 
12)  Take target out, and start Moller polarimeter setup and polarization measurement.  Don would like to be called ~1hr before this starts.
13)  After Moller backout is complete, go to the carbon hole target and take a run at 5uA with +1mm offset in X from nominal position to verify centering.  Simona would like to be called when the Moller is ramping down.
14)  Turn on SBS to 100%.  OPS will need to check the beam motion on the dump.  Take a 5uA run on carbon hole run with +1mm offset in X from nominal position to verify centering.
15)  Go to target out, and try to ramp the beam current up as high as it can go with reasonable trip rates
16)  Do a BCM calibration with target out
16)  Take a run on the evacuated reference cell to check scraping.  {What beam current?  Or should this be a range of currents?}
17)  Go to the He-3 cell.  Step the current up "slowly" {What maximum current, 40uA, 60uA?  How will we decide when to stop?}


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