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Attached is the TPC locations relative to the magnet center.

Updated on Thu, 2024-01-11 09:56. Originally created by fisyak on 2024-01-08 15:22.

Ilardo, Matthew <milardo@bnl.gov>  Monday, January 8, 2024 at 12:05 PM 
Attached is the TPC locations relative to the magnet coordinate system. 

Result of survey on TPC and TPC Wheel positions (alpha is rotation around X, beta is rotation around Y, and gamma rotation around Z, in the STAR coordinated system)

TpcPosition.r2023.C (== East Wheel position)
         beta    gamma       alpha           x0            y0            z0
-0.00048, 0.00036,  0.00010,  -0.2383,  -0.1732,  -0.1957,"2013 Tpc"
-0.00037, 0.00037,-0.00014,  -0.1100,  -0.2881,  -0.3062,"2024 Tpc"
 
TpcHalfPosition.r2023.C
     beta         gamma      alpha            x0            y0              z0                                     dZ
  0.00000,  0.00004, 0.00000,    0.0000,    0.0000,-231.4880,"2003 east"}, =>            0
  0.00012,-0.00039, 0.00013,    0.0393,  -0.0305,  231.4759,"2003 west"}  => -0.0156
  0.00000,  0.00000, 0.00000,    0.0000,    0.0355,-256.7170,"2024 east"}, =>            0
-0.00003,-0.00031, 0.00035,  -0.0639,  -0.0978,  257.0056,"2024 west"}  =>   0.2886
The East Wheel (== TPC) : the difference in rotations with respect to 2023 survey  are practically the same within 0.1 mrad, there are shifts ~0.2 cm in X, Y, and Z

 

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