Thanks for the report, Pete.
Regards,
Michael
On Fri, 4 Feb 2005, Peter Karpius wrote:
> Hi Michael-
>
> I have received calculations from Daniel Phillips as well, GC, GQ,
> and GM, I assume the same that Chi rec'd. Am working to incorporate them
> into my code soon. Currently I am working out stat error in Q2 and
> overall systematic errors. H. Arenhoevel has sent me correspondence
> regarding his conventions for relating the spherical and cartesian tensor
> moments and I am working to reconcile any differences with what I am
> using. H.A. will be sending calculations soon. I asked that he break
> things up into different contributions (MECs etc). Also seeing
> what happens when we go from two data points to one. This
> exercise has a motivation that is two-fold. First, it lowers
> statistical errors. Second, the weighted mean Q2 value will place
> my G_M measurement in a region more barren of world data. Hopefully will
> have something soon.
>
> Cheers,
> Pete
>
>
>
>
>
>
> On Thu, 3 Feb 2005, Michael Kohl wrote:
>
> > Hi,
> >
> > here are the minutes of our meeting yesterday:
> >
> > Visit of D. Phillips - Post-Discussion
> > + Theoretical framework is very nice and highly appreciated
> > + CZ received email from D. Phillips, needs to convert file format
> > + Extraction of GEn from T20 (Schiavilla and Sick) is not further
> > improved when T20 is improved, because T20 would only determine the
> > G_Q piece in A, but the sensitivity to GEn is still coming from A;
> > and is limited by the uncertainty of A. T20 by itself is
> > proportional to GC/GQ, i.e. the isoscalar charge form factor, where
> > GEn contributes at a 5% level only
> > + Theory has some flaws though:
> > Main weakness recognized is the issue to reproduce the quadrupole
> > moment. In adjusting it, the theory leaves its path from first
> > principles. Arising uncertainties not quantitatively clear.
> > + Discussion about ion polarimeter measurement/theory normalization:
> > The character of the theoretical uncertainty suggest to push for an
> > ion pol measurement. A purely experimental error of comparable size
> > like the theoretical is still preferrable, at least it adds
> > information.
> > It's not clear at this point if a measurement is now feasible.
> >
> > Kinematical corrections: Hydrogen method (EG) vs. MC method (AM)
> > + Eugene showing dp=pe-pe(te) vs. pe, for various TOF numbers. Data
> > from each TOF appear as slices
> > + plotting projected dp histograms for individual TOFS: centroids
> > appear to TOF-number dependent
> > + angle reconstruction is fine theta_p - theta_calc(e): centroids
> > zero, resolution <1 degree.
> > + comparing pe and pecalc for different tofs:
> > - p(theta) much better defined than p
> > - pe resolution at forward angle (electrons) better than at larger
> > angle
> > - proton momentum better defined than electron momentum
> > + Momentum corrections for electrons up to 50 MeV
> > + Speculations why electron momentum is wrong:
> > - TOSCA for Cerenkov shieldings?
> > - Error in magnetic field map or its application
> >
> > Holding field map (AS, CZ)
> > + Not discussed at this time
> >
> > Inclusive + N-Delta analysis (NM, TF, YX)
> > + TF not present, NM has Wednesday class, YX needs more time
> >
> > Recrunch status and disk space
> >
> > Recrunch status:
> > + Runs 11251-12672 have been lrn'ed with v3.4.4 (i.e. now they have
> > "proper" DSTs). They are presently in ANALDIR/v3_4_4 and will soon
> > be moved to $ANALDIR=/net/data/9/Analysis/data.
> > + Backup copies of the original online-crunched runs 11251-12672 are
> > on the buds (md5sum-checked) with links pointing to them in
> > $ANALDIR/online_crunch.
> > + $ANALDIR/v3_4_4 will be used further for lrd-recrunch(es).
> > + Runs 12673-13266 have been lrd'ed and are in $ANALDIR/v3_4_4.
> > + I will invoke a recrunch with lrn for runs 11250 backwards soon, in
> > order establish "proper DSTs" and use improved
> > calibrations. Previous online-crunch results will be temporarily
> > backed up on the buds with links in ANALDIR/online_crunch.
> >
> > Disk space:
> > + At present, one 750GB spud is completely available, and another,
> > presently mirrored spud will be available after tape archiving is
> > complete.
> > + Yet another spud (750GB) would be available if pre-production data
> > are deleted or moved
> > + 1.5TB spud10 to be available soon
> > + Two mirrored spuds are necessary at all times for DAQ during the new
> > run
> > + Enough space atpresent to start running, but need to extend after
> > ~1 month
> > + Desirable to have two analysis partitions, one which covers all lrn
> > results, and one which covers all lrd results, i.e. two spud raids
> > for analysis.
> > + Consider to spend ~$8k for 2 more (spud11 and spud12), with >2TB
> > raid servers.
> >
> > 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 | |
> > +-------------------------------------+--------------------------+
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
> ----------------------------------------------
> Pete Karpius
> Graduate Research Assistant
> Nuclear Physics Group
> University of New Hampshire
> phone: (603)978-6152
> FAX: (603)862-2998
> email: karpiusp@einstein.unh.edu
> http://pubpages.unh.edu/~pkarpius/homepage.htm
> ----------------------------------------------
>
--+-------------------------------------+--------------------------+ | 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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