[Frost] target polarization

[Sungkyun Park]

Hi all,

I have simply summarized the target polarization in the circular polarized beam

  http://hadron.physics.fsu.edu/~skpark/research/research_jan2811.html

In the data of the circular polarized beam of g9a, there are seven groups of runs with similar conditions (target polarization, 1/2 wavr plate status), I defined them as period. 

Simply, period 1,2,3, and 5 are mismatched between Jo's results and results on the run-table. We need to check their status again.

Sung 
Florida Status University


----- Original Message -----
From: mcandrew at jlab.org
Date: Friday, January 28, 2011 7:44 am
Subject: Re: [Frost] target polarization
To: Michael Dugger <dugger at jlab.org>
Cc: Steffen Strauch <strauch at sc.edu>, FROST <frost at jlab.org>

> Hi all,
> 
> Back in October I looked again at the NMR data to check the signs 
> of the
> target polarisation in the run table.
> 
> For what it's worth, here's my Wiki page summarising this 
> investigationand tables showing what I believe the target 
> polarisation should be for
> all runs:
> 
> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Checking_Target_Polarisation
> 
> Hope this helps!
> 
> Jo.
> 
> >
> > Hi,
> >
> > Is there a general agreement within FROST that we use the helicity
> > assignments given at the bottom of the Helicity assignment web 
> page at
> > 
> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Helicity_assignment_for_g9a> ?
> >
> > Is anyone using helicity assignments different than those given by
> > Steffen?
> >
> > I think we should be clear as to what values everyone should use.
> >
> > Thanks for your time.
> >
> > Take care,
> > Michael
> >
> > On Thu, 27 Jan 2011, Steffen Strauch wrote:
> >
> >> Dear Michael,
> >>
> >> The statistics of the pi+N data is good enough to look at the
> >> asymmetries run-by-run.  That all runs give consistent results 
> of the
> >> experimental asymmetry despite different target polarizations, 
> target>> field settings, and half-wave plate configurations, except 
> for all runs
> >> with 1.645 GeV beam energy, hints in my opinion at a difference 
> between>> the status of the helicity bit and the actual beam 
> helicity in the hall
> >> for the two electron beam energies.
> >>
> >> I discussed this some time ago with Stepan and he mentioned that 
> "it is
> >> not uncommon that definition of the helicity bit changes with 
> changes in
> >> injector."  I was hoping the Moeller runs would allow to give a 
> unique>> correlation between the helicity bit and the actual beam 
> helicity.>> Information about the g9a Moeller runs are posted at 
> the bottom of the
> >> following page:
> >>
> >> 
> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Beam_Polarization_%28Circ.%29>>
> >> I haven't followed up on that since though.
> >>
> >> All the best,
> >> Steffen
> >>
> >>
> >>
> >> On Jan 27, 2011, at 2:54 PM, Michael Dugger wrote:
> >>
> >>>
> >>> Hi,
> >>>
> >>> I would like to have a FROST approved list of target polarization
> >>> directions for g9a on a run by run basis.
> >>>
> >>> I have been looking at the "Helicity assignment for g9a" web 
> page at
> >>> 
> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Helicity_assignment_for_g9a>>> and see different results!
> >>>
> >>> Brian has told me that I might want to use Steffen's list, but 
> I am
> >>> concerned about the comment:
> >>> "The asymmetry of the 1.645 GeV data has the opposite sign 
> without an
> >>> additional sign change. This sign change needs still to be 
> understood.">>>
> >>> We need one single FROST approved list. Does this list exist?
> >>>
> >>> Thanks for your time.
> >>>
> >>> -Michael
> >>> _______________________________________________
> >>> Frost mailing list
> >>> Frost at jlab.org
> >>> https://mailman.jlab.org/mailman/listinfo/frost
> >>
> >>
> > _______________________________________________
> > Frost mailing list
> > Frost at jlab.org
> > https://mailman.jlab.org/mailman/listinfo/frost
> >
> 
> 
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 Florida State University