Re: [fluka-discuss]: particle cosine direction in mgdraw in cosmic ray simulations

From: Stefan Roesler <sroesler_at_mail.cern.ch>
Date: Sat, 6 Apr 2019 11:46:49 +0200

Dear Chuanlei Liu

The direction cosines are defined in the coordinate frame of your
simulation geometry (geomagnetic system)

Please see also
https://indico.cern.ch/event/334606/contributions/779790/attachments/653365/898411/AdvancedCosmicRays2014.pdf

Hope this anwsers your question

Cheers
Stefan


On Tue, 2 Apr 2019, Liu, Chuanlei (HC/SC) wrote:

>
> Dear Fluka Experts/Users,
>
>  
>
> We are trying to study the secondary cosmic flux at a certain location with
> Fluka and save all boundary crossing particles in a file by using mgdraw
> subroutine (and USRBDX command).  The earth model was created with
> atmloc_2011.f program.
>
>  
>
> We understood that the crossing position can be retrieved in mgdraw with
> XSCO/YSCO/ZSCO variables and, in our case, these coordinates are in the
> geomagnetic system. However one thing we are not quite clear is that, in
> which coordinate system the particle direction (CXTRCK/CYTRCK/CZTRCK) was
> calculated. We want to check the particle zenith angle distribution (dot
> production between the position vector and the direction vector), but have
> to make sure all these vectors are defined in the same system. Can someone
> confirm the system in which the direction (cosine values) was calculated
> please? Thanks.
>
>  
>
> We also tried to understand the third parameter in the subroutine
> GEOGMG(arg1, arg2, par). We know par=4 is to convert system from Cartesian
> to geomagnetic system, but what parameter 1, 2, and 3 mean in this
> subroutine. Thanks.
>
>  
>
> Best,
>
> Chuanlei Liu
>
>
>

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Received on Sat Apr 06 2019 - 13:00:50 CEST

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