[fluka-discuss]: RE: regarding usrbin rotation

From: Ševčik Aleksandras <aleksandras.sevcik_at_ktu.edu>
Date: Thu, 15 Aug 2019 08:09:08 +0000

Thanks Mario,

Here I attach the picture from the actual experiment. You see I have several films at different angles in the same voxel geometry. Hopefully my intentions what to do is clear now.
Do I understand you correctly that I need to do the transform of the whole geometry as well ? But wouldn't it change the actual beam path?

[cid:image003.jpg_at_01D55359.DA089D10]
Alex


From: Santana, Mario <msantana_at_slac.stanford.edu>
Sent: Thursday, August 15, 2019 10:38
To: Ševčik Aleksandras <aleksandras.sevcik_at_ktu.edu>; fluka-discuss_at_fluka.org
Subject: Re: regarding usrbin rotation

Alex,

As you guessed correctly ROTPRBIN needs to be associated both to a ROT-DEFI card (where you define the roto-translation characteristics) and to which USRBIN(s) it applies. This scheme should be (is) completely unrelated to the beam orientation, which is controlled via the BEAMAXIS card.
Typically, you will use ROTPRBIN when you want to orient a mesh with the axis of a body (e.g. target) that is not aligned to x,y,z. In that case, the most usual/clean approach is to use the same rotation in the body definitions of that component (actually you must use the invert rotation, i.e. with a minus sign) through the $start_transform,...,$end_transform declarations.
One important thing to know about ROT-DEFI is that rotations are performed around the ORIGIN 0,0,0. and the order in which rotations are applied (if more than one) obviously matters.

-M



________________________________
From: owner-fluka-discuss_at_mi.infn.it<mailto:owner-fluka-discuss_at_mi.infn.it> <owner-fluka-discuss_at_mi.infn.it<mailto:owner-fluka-discuss_at_mi.infn.it>> on behalf of Ševčik Aleksandras <aleksandras.sevcik_at_ktu.edu<mailto:aleksandras.sevcik_at_ktu.edu>>
Sent: Wednesday, August 14, 2019 10:52 AM
To: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org> <fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>>
Subject: [fluka-discuss]: regarding usrbin rotation


Dear Experts,



Kindly ask for your advice regarding the rotation of USRBIN. I checked the manual and some archive messages, yet I am still a bit lost. I am using ROTPRBIN and ROT-DEFI cards to rotate the scoring usrbin mesh, however, I don't understand why the beam itself moves. Could please someone explain the rotation principles of usrbin in layman terms? My idea is very simple, see in the attached principle - I have a specific beam that irradiates the body at the certain angle. I need to see the irradiation distribution aligned not with the beam coordinates, but with the body axes. The beam must not move. As I see, it is not enough just to use ROTRPRBIN>ROT-DEFI cards before the USRBIN, but some other things must be done?



Thank you very much!



Alex





[cid:image001.jpg_at_01D55359.7A2F90B0]






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Received on Thu Aug 15 2019 - 12:20:59 CEST