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Results of the TPC survey 01/08/2024
Updated on Thu, 2024-01-11 11:45. Originally created by fisyak on 2024-01-11 09:59.
i.e. the distance between holes from the survey are ~0.1 cm larger than from the drawings (?).
I don't understand a reason for this difference.
lardo, 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
One more measurement: From the STAR Inner/Outer sector drawing we know distance between the sector holes:
One more measurement: From the STAR Inner/Outer sector drawing we know distance between the sector holes:
Distance between holes Outer Sector 26.005" = 66.027 cm ~/Documents/Documents - Yuri/STAR Notes/Tpc Drawing/24A0205B\ Outer\ Sector\ Assembly.dwg
Inner 25.280" = 64.211 cm ~/Documents/Documents - Yuri/STAR Notes/Tpc Drawing /24A0335\ Inner\ Sector\ Assembly.dwg
The average distance between holes for the West and East sectors are;
West Inner: dR = 64.3428 - 64.211 = 0.1318 cm
East Inner: dR = 64.3212 - 64.211 = 0.1102 cm
West Outer: dR = 66.1266 - 66.027 = 0.0996 cm
East Outer: dR = 66.2869 - 66.027 = 0.2600 cm
i.e. the distance between holes from the survey are ~0.1 cm larger than from the drawings (?).
I don't understand a reason for this difference.
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