[PEPPo] Fwd: [ATLis] COMPLETED: PEPPo: Beam to Compton Transmission Polarimeter (a.k.a. Party Time !)

[Paul Gueye]

Another great achievement!! Congratulations to all.

Begin forwarded message:

> From: grames at jlab.org
> Subject: [ATLis] COMPLETED: PEPPo: Beam to Compton Transmission Polarimeter (a.k.a. Party Time !)
> Date: February 29, 2012 8:00:02 AM EST
> To: theo at jlab.org, suhring at jlab.org, menefee at jlab.org, kujawa at jlab.org, jkelly at jlab.org, jennifer at jlab.org, suleiman at jlab.org, garza at jlab.org, okay at jlab.org, francis at jlab.org, gonzales at jlab.org, stitts at jlab.org, cumbia at jlab.org, musson at jlab.org, windham at jlab.org, colek at jlab.org, lir at jlab.org, wolfley at jlab.org, delacruz at jlab.org, roblin at jlab.org, keesee at jlab.org, grames at jlab.org, hansknec at jlab.org, marcy at jlab.org, kazimi at jlab.org, broeker at jlab.org, merz at jlab.org, baggett at jlab.org, hiatt at jlab.org, tiefen at jlab.org, woodg at jlab.org, mstan at jlab.org, philip at jlab.org, mtodd at jlab.org, eller at jlab.org, robertsn at jlab.org, sbruhwel at jlab.org, mahoney at jlab.org, bob at jlab.org, pharrell at jlab.org, rwright at jlab.org, lhurt at jlab.org, chrysost at jlab.org, davidg at jlab.org, wilsonn at jlab.org, higgins at jlab.org, weihl at jlab.org, taylor at jlab.org, tdesalvo at jlab.org, manthony at jlab.org, fanning at jlab.org, ywang at jlab.org, carlino at jlab.org, spraggin at jlab.org, lehmann at jlab.org, vasilaus at jlab.org, hamlette at jlab.org, welch at jlab.org, vylet at jlab.org, robertd at jlab.org, cuffe at jlab.org, bevins at jlab.org, lauze at jlab.org, tsm at jlab.org, lmclan at jlab.org, erb at jlab.org, dahlberg at jlab.org, curtis at jlab.org, voutier at jlab.org, gueye at jlab.org, poelker at jlab.org, real at jlab.org, covrig at jlab.org, cuevas at jlab.org, camsonne at jlab.org, hyde at jlab.org, cardman at jlab.org, tforest at jlab.org, murazj at jlab.org, golge at jlab.org, eforman at jlab.org, yjkim at jlab.org, marton at jlab.org, setisadi at jlab.org, dadoun at jlab.org, adeyemi at jlab.org, fanchini at jlab.org, may at jlab.org, kjeldsen at jlab.org, benesch at jlab.org, bickley at jlab.org, dnapier at jlab.org, freyberg at jlab.org, rmichaud at jlab.org, patrickc at jlab.org
> 
> PEPPo: Beam to Compton Transmission Polarimeter (a.k.a. Party Time !)
> comments/History:
> 02/29/12 07:58 COMPLETED by J_Grames:
> We successfully transported the beam (KE=6.2MeV, I<2nA)
> through the apparatus and to the final beam termination
> point, the "T2" reconversion target at the positron
> polarimeter. We measured the current on T2 because it's
> electrically isolated to our current monitors.  Turns out,
> pretty easy to do.  Then, we took some preliminary
> signal/background polarimeter measurements w/ beam in T2 and
> in the PEPDUMP (spectrometer vacuum chamber dump).  Details
> here: http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1672377
> 02/24/12 17:00 OPS REVIEW by P_Vasilauskis:
> 02/24/12 09:18 PRIORITY ASSIGNED by A_Freyberger:
> see more comments...
> Beam Test
> BEAM Testplan has been reviewed by Ops group.
> The test is invasive and will disrupt beam delivery to halls
> Test to be performed by Joe Grames, Riad Suleiman, Eric Voutier, Erica Fanchini
> Required Current(s)
> TUNE MODE
> Beam Source: C
> 0 uA - 1 uA
> Energy Requirement(s)
> Injector
> Termination Point(s)
> 5D - PEPPo Experiment
> Critical Tools
> The testplan author has specified that the following tools must be available.
> Archiver
> Striptool
> Beam Testplan Details
> Brief Purpose of Test
> Transport VL beam to Compton transmission polarimeter to continue HCO.
> Anticipated Benefits
> VL beam will be transported through beam line, vacuum window and to final termination point, the Compton transmission polarimeter reconversion target (W=2mm).  This allows HCO of all components of experiment.
> Special Beam Conditions Required
> Set crew chief CW inhibit
> Hardware and/or Software Changes Required
> None
> Special Hazards/Safety Considerations (enter ""None"" if not applicable)
> None
> Setup Procedure
> 1. Remove admin LOTO from MPD5D03
> 2. Reduce laser amp to improve control of <1nA VL and TUNE mode beam
> 3. Open PEPPo vacuum valve
> 4. Energize 5 MeV dipole to 4D termination (selection #4)
> 5. Set spectrometer for electron mode (NEGATIVE) nominally 152A
> 6. Set analyzer magnet nominal polarization 60A
> Test Procedure
> 1. Setup ~1nA VL beam to PEPCUP.
> 2. Measure PEPCUP current using ItoV
> 3. Remove PEPCUP to terminate beam on reconversion target T2
> 4. Measure T2 current using ItoV
> 5. Measure/study polarimeter signal
> 6. Measure/study fiber array signal
> Backout Procedure
> 1. Restore original magnet setpoints
> 2. Restore original laser power
> 3. Close PEPPo vacuum valve
>  
> Status
> Application:	ATLis
> Task ID:	12091
> Task Status:	DONE
> Time Estimate:	3 Hours
> Required PSS:	BP
> Priority:	Next Beam Studies
> Scheduled:	
> Created:	02/24/12 08:40
> Last Modified:	02/29/12 07:58
> Created By:	J_Grames (x.7097)
> Owned By:	J_Grames (x.7097)
> Created For:	INJECTOR
> Responsible:	Joe Grames
> Project:	Other - No Project
> Charge Code:	
> Risk Classification
> (pre-mitigation):	
> Risk Classification
> (post-mitigation):	
> Systems
> CONTROLS
> DIAGS
> GUN
> DC PWR
> PSS
> MAGNET
> INSTALL
> OPS
> RADCON
> SW
> ALIGNMENT
> PEPPO
> Areas
> ENCLOSURE:
> Injector
> BUILDINGS:
> Elog References
> 1673511: COMPLETED PEPPo: Beam to Compton Transmission Polarimeter (a.k.a. Party Time !)
> Attachments
> 
> Add an attachment...

-- 
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 Paul Gueye
* Hampton University
  Physics Department - 102E
  Hampton, VA 23668
  W: (757) 727-5542
  F: (757) 728-6910
  E: paul.gueye at hamptonu.edu
* Jefferson Lab
  Physics Division - F382
  12000, Jefferson Avenue
  Newport News, VA 23606
  W: (757) 269-6287
  E: gueye at jlab.org
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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