As I reported on Fri, 4 Mar 2005:
>-Runs 11251-12672 have been lrn'ed with v3.4.4 (i.e. now they have
> "proper" DSTs). They have now been moved to
> $ANALDIR=/net/data/9/Analysis/data.
I'm in the process of lrd'ing runs 11251-12672 (see my message from
Sat, 26 Mar 2005). This recrunch is complete now but I still have to
verify it in terms of crashes etc.; results went to
/net/data/10/Analysis/data/v3_4_5/ .
Regards,
Michael
p.s. I'm keeping you guys posted about any changes of the recrunching
status, so please keep those emails in a particular place if you are
interested in doing analysis
On Wed, 30 Mar 2005, Eugene J. Geis wrote:
> Where are the recrunched runs from v3_4_4, specifically, 11252-12013?
> They're not in /net/data/9/Analysis/data/v3_4_4
>
>
>
> Quoting Michael Kohl <kohlm@mit.edu>:
>
> > Attending EG,VZ,TA,BT,CC,AS,MK
> >
> > -We should have a rate monitor for (e,e'p, e,e'd, e,e'n) candidate
> > events per Coulomb and log this run-by-run.
> >
> > -Discussing the beam blowup effect. The beam blowup has been
> > quantified by VZ for the neutron trigger by comparing the normalized
> > quasielastic (e,e'n) rates for empty target and for hydrogen target
> > (there is no quasielastic e,e'n production rate from the proton
> > target ...). Therefore this is sensitive to any additional production
> > from cell walls when the target is filled with hydrogen. The result
> > is that the blowup factor is very close to 1.
> >
> > -It may be that the beam blowup effect is different for e,e'p from
> > hydrogen. In principle, one would have to look at a channel that is
> > forbidden in the reaction under consideration. One such channel could
> > be the (e,e'pi-) rate which would require the presence of neutrons in
> > the target. A comparison of (e,e'pi-) with empty and with hydrogen
> > target could be an alternative way to quantify the blowup effect in
> > the charged-trigger channel trig=1
> >
> > -Another way to quantify the background for p(e,e'p) is to vary the
> > cuts on the elastic peak while looking at the observables, or to
> > sample the elastic peak and tail region. Pure radiative-tail events
> > should exhibit the same asymmetry like elastic events (radiative
> > effect is mostly independent of polarization), while any change of
> > the
> > background contribution may dilute the asymmetry (unpolarized
> > background) or change the asymmetry (polarized background, e.g. from
> > pion production events that range in)
> >
> > -The cell background fraction is different for the (e,e'p) and (e,e'n)
> >
> > channels: N_empty/N_deut (e,e'p) > N_empty/N_deut (e,e'n). A possible
> >
> > reason could be that the ratio of e,e'p/e,e'n is different for
> > scattering from aluminum and for deuterium.
> >
> > -The missing momentum in p(e,e'p) is also sensitive to background
> > from other sources than hydrogen. It should peak at a very small value
> >
> > suggested by the resolution (20?? MeV/c?) whereas in quasielastic
> > scattering it should peak around 50 MeV/c for deuterium and 80-100MeV/c
> >
> > for heavier nuclei.
> >
> >
> >
> > -The definition of the dataset for the next release of preliminary
> > data will be "BLAST 2004", including all deuterium and hydrogen data
> > of 2004. This will be the data shown at coming conferences and on
> > other occasions. It extends the previous preliminary dataset on
> > deuterium by about four weeks of running in Sept/Oct 2004, and for
> > hydrogen it will be extended by the whole run of Oct-Dec 2004.
> > The 2005 data is not at a stage where a preliminary version may
> > be released. Nevertheless at next week's collaboration meeting the
> > present status of the analysis also of the 2005 data shall be
> > discussed. People should therefore prepare results separately for the
> > BLAST 2004 dataset and the 2005 or 2004+2005 data!
> > We shall have a projected gain of the figure-of-merit for the 2005 run
> > by
> > next week that may be quoted in presentations.
> >
> > -Plan is to have all data calibrated and recrunched by the next
> > collaboration meeting end of June / early July (= pre-final data)
> >
> > -After this some fine-tuning may still be necessary. We shall push hard
> > to
> > get final results for the "key reactions" (GEn, T20, A_ed^V(e,e'p),
> > GEp/GMp by fall!
> >
> >
> > -I will send out an agenda for the coming big meeting on Wednesday 4/6
> >
> > soon.
> >
> >
> > Regards,
> >
> > Michael
> >
> > --
> >
> > +-------------------------------------+--------------------------+
> > | Office: | Home: |
> > |-------------------------------------|--------------------------|
> > | Dr. Michael Kohl | Michael Kohl |
> > | Laboratory for Nuclear Science | 5 Ibbetson Street |
> > | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
> > | Middleton, MA 01949 | U.S.A. |
> > | U.S.A. | |
> > | - - - - - - - - - - - - | - - - - - - - - -|
> > | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
> > | Work: +1-617-253-9207 | Home: +1-617-629-3147 |
> > | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
> > | http://blast.lns.mit.edu | |
> > +-------------------------------------+--------------------------+
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
> --------------------------------------------------------------------------
> Eugene Geis
> PhD Student, Physics Department, ASU
> Research Affiliate, MIT-Bates Laboratory of Nuclear Science
> eugene.geis@asu.edu
> --------------------------------------------------------------------------
> http://quickreaction.blogspot.com
>
--+-------------------------------------+--------------------------+ | Office: | Home: | |-------------------------------------|--------------------------| | Dr. Michael Kohl | Michael Kohl | | Laboratory for Nuclear Science | 5 Ibbetson Street | | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 | | Middleton, MA 01949 | U.S.A. | | U.S.A. | | | - - - - - - - - - - - - | - - - - - - - - -| | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de | | Work: +1-617-253-9207 | Home: +1-617-629-3147 | | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 | | http://blast.lns.mit.edu | | +-------------------------------------+--------------------------+
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