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Definiton of Glad center of Glad magnetic field map center [message #19495]

Wed, 31 August 2016 17:46

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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Re: Definiton of Glad center of Glad magnetic field map center [message #19548 is a reply to message #19495]

Wed, 14 September 2016 14:53

Dmytro Kresan
Messages: 166
Registered: June 2004

first-grade participant

From: *gsi.de

Hello Yelei,

1) These coordinates are global with respect to the target. It is the center of keeping volume for GLAD, which actually defines the rotation point. The coordinates of daughter volumes are then defined relative to the keeping box.

2) Part of this question is answered here

Concerning the rotation angle, the mismatch has been fixed, now it is 14 deg in both cases. Consult https://www.r3broot.gsi.de/r3broot-update on how to obtain the changes.

Best regards,
Dima

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