No specific topic, we are going around the people being present.
- NM:
+update on inclusive D(e,e')
60 cm runs 71??-77??
plots yields/asymmetries vs. w-Q2/2m
comparison with MC
applies show_deepn_asym....C sees discrepancies, looks into it.
- PK:
+Working on online monitoring of tdc offsets, pedstals, etc.
+Uses TGraph for datbase monitor GUI, discusses "update" feature of the
GUI, whenever there is a new, latest database entry.
+Monitors expected to be ready next week.
- VZ:
+Generates neutron timing constants from cosmics analysis
+Resolution of photon peak presently at 5-7ns FWHM (~13%)
+lower limit of 5% resolution due to detector thickness of L20 (20cm)
+MC changes: holding field map for 45 degree angle implemented, works with
white generator only, rescaling of longitudinal component planned
- AM:
+shows first 60cm MC for deuterium compared with Arenhoevel theory
gross behavior looks fine
+background/empty target:
background between 40cm/60cm cell has rised
electronics.map issues should not be the case for empty target analysis
new empty target data not yet analyzed
VZ interested in background versus Q2. Background asymmetry?
- TA:
+continued full tracking on line segments, not complete, ongoing
- CC:
+Progress on wire chamber calibration, inter-connecting cells.
Wants to give talk next time
+Requests a (grad) student to perform fitting work (Eugene?) or an
undergrad.
+Has an explanation for jump in resolution as function of phi (at certain
phi cells drifting apart of each other)
- DH:
+gives lecture on attempt to parameterize swimming of tracks
+mid-point of a track in each superlayer best defined (115mu) compared to
the other two (200mu)
+gets x1-x6 for three superlayers (2 x's each)
+parameterize P,theta,phi,z (x_i) with polynomial
+generates MC e': P 50MeV-1GeV, theta 5deg-100deg, phi -17.5-17.5 ,
z -500-500
+propagate events into Wch
+resolve for polynom parameters
+CUBCUB lazy-6th order solution (reduced matrix)
+200mu assuming 200mu in x_i resolution
+obtained resolutions:
LIN QUAD CUB BLASTMC CUBCUB +200mu
p/MeV 160 87 67 30 8 30
h/mr 32 12 5 8 0.6 4.8
f/mr 15 3 2 12 0.4 2.3
z/mm 24 9 3.5 10 0.5 4.5
+obtained momentum resolution is ~2% on MC data. Needs to apply to real
data.
+turn on physics in MC
+can "train" the algorithm also with real (elastic) data
+assumes that t2d works correctly
+Maybe ultimately a replacement for the swimming method. Is FAST! VERY FAST!
- about recrunching
+separate neutron analysis and Wch resolution needs for recrunch
+neutron recrunch from dst, need to change "lrd" such that tracking is
not repeated for electron (or implement option to do so).
+A whole dataset is then expected to be recrunched within a day (CC)
+Total (Wch) recrunch from raw also needed before collaboration meeting,
best peroid during shutdown 6/8-6/22, all buds and spuds available.
+TB fixed Electronics~???.map's, just specify path in blastrc and use
electronics.ma from MYSQL
+CC: Suggested to create tagged cvs versions for lrd/lrn to be used
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 | | +-------------------------------------+--------------------------+
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