[Frost] A couple of things

[Bill Briscoe]

Hi Mike,

We have worked together before, it should work. I would like this to include some student training for my students so they can carry on. Let's discuss this among the smaller ASU GWU groups.

Bill

----- Original Message -----
From: dugger at jlab.org
Date: Monday, June 14, 2010 2:50 pm
Subject: Re: [Frost] A couple of things
To: Bill Briscoe <briscoe at gwu.edu>
Cc: Eugene Pasyuk <pasyuk at jlab.org>, FROST <frost at jlab.org>

> Bill,
> 
> Did you want to work together on the pppi-? The only way that I am willing
> to spend time on it, is if I do the data analysis and am first author.
> 
> I am not willing to fight over that channel. You can have it if you want
> to do the data analysis. There are plenty of things for me to work on.
> 
> Take care,
> Michael
> 
> >
> > Hi Eugene,
> >
> > To answer one question -- we would also be interested in the pppi-
> > channel.
> >
> > Bill
> >
> > ----- Original Message -----
> > From: Eugene Pasyuk <pasyuk at jlab.org>
> > Date: Monday, June 14, 2010 3:36 am
> > Subject: [Frost] A couple of things
> > To: FROST <frost at jlab.org>
> >
> >> Hi all,
> >>
> >> There are couple of things on our hands to take care of.
> >>
> >> The first one is Run coordination for the next two months between June
> >>
> >> 19 and August 13. That's 8 weeks. So far I have not heard voices of
> >> volunteers except Patrick. I hope you don't expect two of us to cover
> >>
> >> these 8 weeks, or do you?
> >>
> >> The second is related to the potential three week extension and
> >> possibility to run with deuteron target. Volker needs written
> >> justification 1-2 pages with brief description of what and why we are
> >>
> >> going to do during this extra time. We also should say who is going 
> to
> >>
> >> analyze these data.
> >> We started this discussion awhile ago. It looks like we reached a
> >> consensus about what we are going to do. Let me summarize.
> >> We will run with linearly polarized beam on transversely polarized
> >> deuteron target. Since the time is limited we can run only one
> >> coherent
> >> edge setting. We can concentrate on the kinematical range around W=1.7
> >>
> >> GeV. I think it reasonable to set coherent edge probably at 1.2 GeV.
> >> Earlier Igor compiled and sent out some data to support this
> >> particular
> >> energy. We need to summarize to something half a page to a page of 
> text.
> >> To run with coh_edge at 1.2 the best would be to go with 3 pass beam.
> >>
> >> That would be 3.36 GeV electron beam. If we go 4 pass, the end of the
> >>
> >> tagging range will be about 0.89 GeV a bit to close to 1.2 GeV.
> >>
> >> We can go after three reactions.
> >> gn->pppi-
> >> gn->npi+pi-
> >> gn->K0Lambda
> >>
> >> There are no doubts about feasibility of the first two. The cross
> >> section is large.
> >> For the third one we need to get some estimates, what we can expect 
> in
> >>
> >> terms of statistics and uncertainties. Franz, you did it for HDIce.
> >> Could you quickly recalculate it for FROST.
> >> A few other things to consider for experiment configuration.
> >> Since all of those reaction requires at least two charged particles 
> to
> >>
> >> be detected we may go with two sector trigger.
> >> For the 2pi reaction we would need to detect recoil neutron. It makes
> >>
> >> sense to turn on LAC to have better acceptance for neutrons.
> >> There is also question of torus field polarity. Do we want to run
> >> reversed polarity (positive inbending) like g13 did or keep it as it
> >> is now?
> >>
> >> We still don't know what material we will have. Two options are being
> >>
> >> considered. d-butanol or d-propandiole. All depends on the
> >> availability
> >> of proper radical.
> >> d-butanol is preferable in terms of dilution factor. The figure of
> >> merit
> >> butanol vs. propandiole is roughly 1.2.
> >> As far as the degree of polarization is concerned with both materials
> >>
> >> people were able to get 80% polarization.
> >> Even though we are talking about three week extension realistically 
> we
> >>
> >> may expect that we will probably have two weeks for data taking (one
> >> week for conversion and set up of the target.
> >>
> >> Manpower for analysis. The list is open. There are some ideas
> >> Mike Dugger (ASU) expressed interest to analyze pppi-.
> >> I would imagine Volker and Steffen would be interested to analyze 2pi?
> >> KLamda - Franz?
> >> Please, comment on this.
> >>
> >> We have to prepare this justification within two weeks.
> >>
> >> -Eugene
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> Frost mailing list
> >> Frost at jlab.org
> >>
> > _______________________________________________
> > Frost mailing list
> > Frost at jlab.org
> > 
> >
> 
>