BigBite Optics #11
Comparison of the target positions:
I have found some potential problems with the relative positions of the targets. I realized that
carbon-optics target seems to be longer than the production cell, although we know, that they should be of
the same size. I believe that this is due to the larger spacing between first two carbon foils.
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Target-Y Calibration:
I realized this week, that my TgY variable has wrong sign. I have fixed this problem and now it is consistent with
the HRSL orientation. Because of this change I also had to correct the matrix elements for the rest of the variables.
This was quite a setback. I also received the email from John J. Lerose, who sent me his simulated BB optics matrix.This helped
me to reduce number of matrix elements from 70 to only 25.
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Current matrix elements for TgY:
Y 0 0 0 0.026327 0.01342 0.0021361 -0.045554 0
Y 2 0 0 0.067379 0.06355 0.014609 0 0
Y 0 1 0 1.0459 -0.13793 0 0 0
Y 0 2 0 0.26524 -0.16913 0 0 0
Y 0 3 0 0.15384 0 0 0 0
Y 0 0 1 -2.8239 0.04012 0 0 0
Y 0 0 3 -0.13591 0 0 0 0
Y 0 1 1 0.35979 -0.088644 0 0 0
Y 0 2 1 0.56537 0 0 0 0
Y 0 1 2 -0.20714 0 0 0 0
Y 2 0 1 3.0852e-06 0 0 0 0
Y 1 0 2 0.07197 0 0 0 0
Y 1 1 0 -0.00067713 0 0 0 0
Y 2 1 0 -0.00013797 0 0 0 0
Y 1 2 0 -0.26673 0 0 0 0
Y 1 1 1 -0.26796 0 0 0 0
Production Cell results (3GeV run #3608)
With my new matrix for the TgY, I compared TgY variable reconstructed with BB with the corresponding TgY variable
calculated from HRS-L. Here are the results:
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Sieve Slit - Current Results:
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Problems with the minimization algorithm:
I am also trying to determine how my final matrix elements depend on the initial set of elements. Here are some plots. It
seems that my minimization algorithm is not working properly. I am trying to do this for all the target variables. This is
work in progress.
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Last modified: 04/21/10
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