Home » NUSTAR » NUSTAR PRESPEC » FRS - TPC Calibrations (Position Calibration Issues)
| Re: FRS - TPC Calibrations [message #18306 is a reply to message #18304] |
Sat, 06 June 2015 12:09  |
mlcortes
Messages: 41
Registered: July 2014
Location: Darmstadt
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continuous participant |
From: *ikp.physik.tu-darmstadt.de
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Hi Tayfun,
Sorry for the delay in replying, it has been a busy week.
First, just as you said, I didn't manage to run the file you are using with prespec code. I do not understand why it runs in the new_prespec_Go4 code, but for the calibration I used file 132.
For that file, ones sees a kind of double grid in y direction. I think this was related to some problem in the delays used for y, but I am not sure. This was the main problem we had to fix.
As this files are the same used for the calibration of the Pb experiment, I think you can give it a try to our calibration parameters 
I want to point out that the calibration was made by Pico, by calibrating individually each y with the grid and after fixing them, calibrating x. Apart from that, he included a y offset to align the TPCs with the TargetDSSD.
So I would suggest that you put this parameters and give it a try.... Hopefully you will see y calibrated. Let me know how it goes
For TPC41:
## Original calibration X (-5.45941 offset -left)
##
cal_x[0] 6.9059240 0.071844
cal_x[1] 2.565379 0.073667
##
## for S429 file 7 TPC projected at TARGET DSSSD were Y-centered at +25.6522
##
## Target DSSSD was Y-centered at -1.51222 so the offset was set to match
##
cal_y[0] 30.523964 -0.036214
cal_y[1] 30.971966 -0.036226
cal_y[2] 32.407504 -0.036935
cal_y[3] 32.488682 -0.036932
For TPC 42
## Original calibration (+1.3447 offset -right)
##
cal_x[0] -1.708523 0.073670
cal_x[1] 0.423916 0.074975
##
## for S429 file 7 TPC projected at TARGET DSSSD were Y-centered at +25.6522
##
## Target DSSSD was Y-centered at -1.51222 so the offset was set to match
##
cal_y[0] 22.986629 -0.038519
cal_y[1] 22.733846 -0.038766
cal_y[2] 21.329802 -0.038116
cal_y[3] 20.819015 -0.037600
Li^2
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