Re: [fluka-discuss]: RotationStudy

From: George Kharashvili <georgek_at_jlab.org>
Date: Thu, 6 Dec 2018 07:11:24 -0500 (EST)

Dear Junyu,

The geometry directives are different from the ROTPRBIN card:
The first transforms the body, the second - the position of the tracked particle before scoring with respect to the defined binning.
In other words, the reason you have to use inverse transformation on USRBIN is that the ROTPRBIN is not transforming the USRBIN to the scoring space, but the scoring space to the USRBIN.
The FLUKA Geometry lecture from the last advanced course can be very helpful in understanding these concepts: https://indico.cern.ch/event/489973/contributions/2000434/attachments/1270257/1881963/05_AdvancedGeometry2016.pdf

Best regards,
George


----- Original Message -----
From: "张俊昱" <2016222020053_at_stu.scu.edu.cn>
To: "FLUKA Discussion List" <fluka-discuss_at_fluka.org>
Sent: Thursday, December 6, 2018 12:15:25 PM
Subject: [fluka-discuss]: RotationStudy

Dear FLUKA experts:




I have a question about rotation operation.




I have a target T, then a scoring USRBIN is set with the same size to T. With no rotation applied, everything works good.




If I apply a rotation M on T, then it seems I have to apply -M to the USRBIN card so that the scoring card can be set to the right position with T. I wonder why there is -M rather than M, in my imaging if the target have the same rotation with scoring mesh, then everything will be good, but seems in the input file it is not in this way.




Can any one give me an explanation about this? Thanks very much.




The input file and flair project file are attached.




Best,

Junyu

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Received on Thu Dec 06 2018 - 15:20:13 CET

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