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Re: FRS - TPC Calibrations [message #18306 is a reply to message #18304] Sat, 06 June 2015 12:09 Go to previous message
mlcortes is currently offline  mlcortes
Messages: 41
Registered: July 2014
Location: Darmstadt
continuous participant
From: *ikp.physik.tu-darmstadt.de
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 Smile
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



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