[E12-15-001] Elastics for VCS experiment

[Mark Jones]

I would suggest that we do elastic for a range of the HMS momentum
that we are using in VCS.

Ebeam     q2    HMS mom HMS ang  SHMS mom   SHMS ang
 4.5500  0.543     0.790          63.8          4.261             9.60
 4.5500  0.687     0.900          60.8          4.184           10.90
 4.5500  0.818     1.00            58.4          4.114           12.00

We should do this first to check out the coincidence timing.
The HMS timing will shift about 30-40 ns compared to the electrons
that are presently in the HMS. I talked to Brad, so he will be available
to adjust the coincidence trigger timing.
We should do one run with singles SHMS trigger and then one run with coincidence
trigger so that we can measure the losses due to proton nuclear interactions at
these momentum.
The rates are very high. So this should not take to long.
Given the high rates , it might be useful to take a run with the sieve in the SHMS.

CHeers,
            Mark

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