Meeting No.9: BigBite Optics Calibration #2
Current BigBite Optics Matrix:
[matrix]
t 1 0 0 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
y 1 0 0 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
p 1 0 0 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
D 0 0 0 -0.0317320 -0.7052700 0.84472400 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
D 1 0 0 2.65852000 -3.7330800 3.08174000 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
D 2 0 0 5.68038000 -4.2024800 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
T 0 0 0 0.0106750 -0.4968080 -0.1145100 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
T 1 0 0 0.4910920 0.12139600 -0.4243960 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
P 0 0 1 1.2000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
Y 0 0 1 -2.552E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
Y 0 1 0 0.9619E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
Y 0 0 0 0.0366E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
DB_run.dat Problem
I believe that BigBite information in the DB_run.dat file are not correct. BigBite scattering
angle is set to -74deg, although bigbite was positioned at -71deg during Ay and -75deg during
e'd. The central momentum of the BigBite also needs to be set. At the moment I set it to 0.5GeV/c
which approximately corresponds to the correct setting according to NIKHEF BigBite paper. At 518A
the field inside the BigBite is 0.92T and the central momentum is 0.5GeV/c
Y_tg calibration:
I have begun my calibration with the calibration of the y_tg variable, which should be fairly easy,
since this is the nondispersive coordinate and should in the first order depend only on FpY and FpPh.
For the calibration I have used the Carbon 7-foil run with sieve-slit (#3491).
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The work is not done yet, because it seems to be working for the Carbon, Deuterium and Helium runs,
but not for the elastic Hydrogen runs.
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For this calibration I have also been using the old DB for the left arm. When I changed the DB, things changed. Therefore I need to correct my results for this change.
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Tg_dp calibration:
For the calibration of the Tg_dp matrix elements I have used the 1GeV and 2GeV Hydrogen
elastic runs #1518 and #3487(#3488):
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In the end I did the fitting of the peaks in Mathematica. Results are shown in this pdf file :
fitDeltaTheta.pdf
Tg_th calibration:
For the calibration of the Tg_th matrix elements I have also used the 1GeV and 2GeV Hydrogen
elastic runs #1518 and #3487(#3488):
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In the end I did the fitting of the peaks in Mathematica. Results are shown in this pdf file :
fitDeltaTheta.pdf
Run #1518 Results with new DB:
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Run #3487+ #3488 Results with new DB:
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Run #3491 Results with new DB:
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Last Modified: 11/09/09
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