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Home » R3BRoot » Simulation Issues » Definiton of Glad center of Glad magnetic field map center (two questions on the Glad geometry definition and field map definition)
Definiton of Glad center of Glad magnetic field map center [message #19495] Wed, 31 August 2016 17:46 Go to previous message
sunny is currently offline  sunny
Messages: 1
Registered: July 2016
occasional visitor
From: *extra.cea.fr
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. Smile

Best regards,
Yelei

 
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