[E12-15-001] Elastics for VCS experiment

[Mark Jones]

I would suggest that we do all the elastic at the beginning. This will cover the range
of concidence times so we will be sure that the trigger works over the
range. Also it will allow us to check the central momentum of the spectrometers.

CHeers,
           Mark
________________________________
From: Hamza Atac <tuc72417 at temple.edu>
Sent: Tuesday, July 2, 2019 2:06 PM
To: Mark Jones
Cc: Nikos Sparveris; e12-15-001 at jlab.org; Paolone
Subject: Re: [E12-15-001] Elastics for VCS experiment

Hi Mark,

Do you want to run all elastics in the beginning of the experiment or run each elastic before running the corresponding kinematics? Since it will take some time to change the momentum settings, would it be more efficient to run each elastic  just before we run  the corresponding kinematics run?

Regards,
Hamza

On Tue, Jul 2, 2019 at 1:50 PM Mark Jones <jones at jlab.org<mailto:jones at jlab.org>> wrote:
1 hour for single only and 1 hour for coincidence.

CHeers,
           Mark
________________________________
From: Hamza Atac <tuc72417 at temple.edu<mailto:tuc72417 at temple.edu>>
Sent: Tuesday, July 2, 2019 1:45 PM
To: Nikos Sparveris
Cc: Mark Jones; e12-15-001 at jlab.org<mailto:e12-15-001 at jlab.org>; Paolone
Subject: Re: [E12-15-001] Elastics for VCS experiment

Hi Mark,

I am updating the runlist on wiki. How long do you think each run  should take? Would one hour be enough for each run ?
Best regards,
Hamza


On Tue, Jul 2, 2019 at 1:24 PM Nikos Sparveris <sparveri at temple.edu<mailto:sparveri at temple.edu>> wrote:
Yes Mark, agreed!
Hamza, please update the run plan accordingly.

N.

---------------------------------------------------
Nikos Sparveris
Associate Professor

Physics Department, Temple University
1925 N. 12th Street
Philadelphia, PA 19122-1801

Phone: +1-215-204-7425
---------------------------------------------------


On Tue, Jul 2, 2019 at 12:54 PM Mark Jones <jones at jlab.org<mailto:jones at jlab.org>> wrote:
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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--
Hamza Atac

Department of Physics
Temple University
SERC Room 413
1925 N. 12th Street
Philadelphia, PA 19122-1801
Phone: +1 215-204-<tel:%2B1%20215-204-5971>1331



--
Hamza Atac

Department of Physics
Temple University
SERC Room 413
1925 N. 12th Street
Philadelphia, PA 19122-1801
Phone: +1 215-204-<tel:%2B1%20215-204-5971>1331

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