| Definiton of Glad center of Glad magnetic field map center [message #19495] |
Wed, 31 August 2016 17:46  |
sunny
Messages: 1
Registered: July 2016
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occasional visitor |
From: *extra.cea.fr
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Hello,
I have two questions on the Glad geometry definition and field map definition:
1)
From the create_glad_geo.C,
>>>Double_t DistanceToTarget = 350.0; //cm
>>>Double_t Correction = -119.94; //cm
>>>...
>>>t0->RotateY(+7.3);
Therefore, I think the distance of glad to the target-center will be 350-119.94 = 230.06cm, with an angle of 7.3deg.
But I'm not sure this distance is relative to which point of Glad. To be specific, what is the coordinate definition in the create_glad_geo.C macro ?
2) There is one magnetic field map under R3BROOT/field/magField/R3B/R3BGladMap.dat, the format is x/y/z/Bx/By/Bz. The x/y/z definition is relative to which frame ? Is it the same as the geometry definition in question 1 ?
In the R3BGladFieldMap.cxx, the translation from lab to local frame of the magnet is done using 14*deg rotation and the transporation gTrans is (0,0,-113.4), which seems not consistent with the values in the geometry defition. I'm confused. 
Best regards,
Yelei
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