[E12-15-001] Elastics for VCS experiment

[Hamza Atac]

Hi Mark,

would we need a dummy run for each elastic run also?

Best regards,
Hamza

On Tue, Jul 2, 2019 at 3:11 PM Mark Jones <jones at jlab.org> wrote:

> 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> 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> wrote:
>
> 1 hour for single only and 1 hour for coincidence.
>
> CHeers,
>            Mark
> ------------------------------
> *From:* Hamza Atac <tuc72417 at temple.edu>
> *Sent:* Tuesday, July 2, 2019 1:45 PM
> *To:* Nikos Sparveris
> *Cc:* Mark Jones; 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>
> 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> 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- <%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- <%2B1%20215-204-5971>1331
>
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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- <%2B1%20215-204-5971>1331
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