[E12-15-001] Elastics for VCS experiment

[Mark Jones]

I agree that it is better to start at the high HMS momentum and work down,
so the HMS will not have to be cycled.
The SHMS is easier to cycle since we set all the SHMS magnets by current.

CHeers,
            Mark
________________________________
From: Joosten, Sylvester Johannes <sjoosten at anl.gov>
Sent: Tuesday, July 2, 2019 2:19 PM
To: Hamza Atac
Cc: Mark Jones; e12-15-001 at jlab.org
Subject: Re: [E12-15-001] Elastics for VCS experiment

Hi Hamza,

My two cents: It might make sense to keep the elastics together to properly commission the coincidence trigger and study the effects of proton nuclear interactions.

You can keep things efficient by starting with the highest HMS momentum, and then continuously lowering the momentum while going through the settings (going through them in reverse order from how Mark send them).

Anyway, just my two cents :-).

Cheers,
Sylvester

On Jul 2, 2019, at 1:06 PM, Hamza Atac <tuc72417 at temple.edu<mailto:tuc72417 at temple.edu>> wrote:

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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