BigBite Optics #10
This week I continued my work on determination of the matrix elements "[TgY|xyz]",
"[TgPh|xyz]" and "[TgTh|xyz]". I was removing the matrix elements for variables
TgPh and ThY. I haven't considered TgTh yet. I have removed majority of forth-order
matrix elements for ThY and approximately 20 various matrix element for ThPh. Now I
have started my optimization again and when it will finish I will be able to see, if I
can remove some more elements.
I have also changed the way I am isolating events that correspond to each sieve-hole for
the TgPh calibration. So far I was using focal-plane cuts for the holes I was not able to see in
the beginning and Sieve cuts for those that were visible from the start. Now I have decided to
use FP cuts only for all the holes. This way I will also be able to easily determine the TgPh and
TgTh resolution.
For the TgY calibration I applied cuts on FpPh and FpY in addition to HRS-L cuts. These cuts gave
me more clean set of events, that I used in my calibration. I have also considered cuts on coincidence-time.
This way I am almost certain that I am considering only good events. For this clean set of data the
current TgY resolution is sigma = 1.0cm (HRS-L sigma is 0.97cm). Without any cuts I have estimated
resolution to be sigma = 1.3cm.
TgPh Plots:
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TgY Plots:
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Last modified: 04/21/10
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