[Mott] commissioning plan

[Xavier Roca Maza]

Dear all,

i wish you all success for the next ~2 weeks of mott commissioning. Please
let me know if you need some calculations (also for different foils) at
this point. From February 18th to February 26th I will be traveling.

Greetings,

Xavi


2014-02-05 22:49 GMT+01:00 Joseph Grames <grames at jlab.org>:

> I'm sorry....replace "March" with "February".  I've gotten too far ahead
> of myself.  :)
>
> ----- Original Message -----
> From: "Joseph Grames" <grames at jlab.org>
> To: mott at jlab.org
> Sent: Wednesday, February 5, 2014 4:42:53 PM
> Subject: [Mott] commissioning plan
>
> Dear Colleagues,
>
> With today's successful demonstration of 2.2GeV/pass CEBAF will change
> gears for the next ~month to allow for other activities.  The good news is
> this includes opportunities over the next ~couple of weeks for Mott
> commissioning.  While it's too early to forecast the entire period, we are
> firmly scheduled each day March 10-14 on SWING shift.  Riad, Marty and I
> will staff these shifts.  The schedule beyond this remains TBD, but has a
> firm end point of March 20 at 7am.   Our plan is to evaluate our progress
> next week before biting off more than we can, or are ready, to accomplish
> in any given day.  We will send out a daily summary and post results to our
> electronic logbooks for those who would like to participate/comment
> remotely.
>
> In the meantime, Riad, Marty and refined our goals for next week:
>
> PART I - Configuration
> ======================
> 1. Choose rep rate - identify whether 31MHz or 63MHz provides best beam
> quality at Mott target vs. seed bias and prebuncher
> 2. Test Mott setup script - completes revision of software to eliminate
> cryounit changes and integrate target motion
> 3. Set TDC timing delay - ensures signal and background events occur
> similarly from each detector package
> 4. Repeat PMT HV setup - increase and match PMT signal gain following
> recent repair of down-dE
> 5. Final DAQ punchlist - generate punch list of remaining DAQ
> labeling/cosmetic issues
> 6. Analysis macro development - produce high quality, high statistics run
> to generate analysis parameters for systematic studies
> 7. Beam setup - Set energy KE=5.0MeV crested, polarization transverse (X
> or Y), helicity reversal 30Hz, real-time, quartet
> 8. Mott setup - Dump dipole degaussed, 1 micron gold foil
> 9. Sign-off - Before moving on, a clear assessment of signal/DAQ setup,
> rates and instrumental asymmetries
>
> PART II - Systematics (coincident energy + TOF spectra to yield rate,
> physics asymmetry, instrumental asymmetry)
>
> ================================================================================================================
> 1. Beam position - deflect at target Left, Right, Up, Down, Center;
> estimate position from target ladder
> 2. Beam intensity - linearity and dead time study over allowed range 0-2 uA
> 3. Beam spot size - adjust MQJ0L02/MQJ0L02A for aspect ratio and size by
> factor two
> 4. Beam energy - change KE is finite steps (4.5MeV, 4.75MeV, 5.00MeV,
> 5.25MeV, 5.50MeV)
> 5. Beam energy spread - change cavity phase off crest while retaining
> KE=5.00MeV (-10deg, -5deg, 0deg, +5deg, +10deg)
> 6. Stability - long run (~2 hours) to study stability with statistics
> ~0.25% in 5min bin
> 7. Target reproducibility - compare pairs of foils (two 1um Au, two 0.5um
> Au)
> 8. HC Intensity - test response for intensity asymmetry applied by laser
> (IA)
> 9. HC Position/Angle - test response for position difference applied by
> magnets (HELMAG)
> 10. Sign-off - Before moving on a reasonable assessment of leading order
> term (intensity) and systematic issues for future investigation.
>
> PART III - Survey
> =================
> 1. Survey foils - collect ~similar statistics on Au, Ag, Cu to
> characterize foil and dump events
>
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>
>


-- 


Xavier Roca-Maza
Assistant Professor (Ricercatore a Tempo Determinato)

Dipartimento di Fisica,        e-mail: xavier.roca.maza at mi.infn.it
Universita' degli Studi,        Phone: *+39-02-503-17290* (Office)
Via Celoria 16                    Fax: *+39-02-503-17-487*
20133 Milano (Italia)           Web page: http://www.mi.infn.it/~jroca/
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