Re: [fluka-discuss]: Roughness of material

From: Віктор Родін <viktor94_at_knu.ua>
Date: Thu, 8 Jun 2017 13:58:30 +0300

Dear Paola
Thank you for explaining. It's fully clear to me.
Cheers.
Viktor

2017-06-08 13:04 GMT+03:00 paola sala <paola.sala_at_cern.ch>:

> Dear Viktor
> the quantity to be changed is the retrun value of the function (it set to
> 0 in the template).
> The code "smears" the direction of the normal to the surface,
> sampling the cosine of its angle with respect to the "unperturbed" normal ,
> assuming a gaussian distribution of this cosine, centered at 1
> (unperturbed value), with variance=FRGHNS.
> Reflection and refraction are calculated with respect to the "new" normal
> to the surface.
> The value of FRGHNS is bounded to be smaller than 0.5.
>
> Hope this helps, and..
> The documentation will be updated!
>
> Regards
> Paola
>
>
> On 06/07/2017 10:56 AM, Віктор Родін wrote:
>
> Hello dear FLUKA users,
> I'm working with optical photons now and want to compare differencies
> beetwen roughned and smooth surfaces. FLUKA sets ideal smooth surface of
> material by default. I have found description of *frghns* subroutine in
> Online FLUKA manual but I still wandering what to change in it:
>
> Argument list (all variables are input only):
> TXX, TYY, TZZ : particle direction cosines
> UXSRFC, UYSRFC, UZSRFC: direction of the normal to the surface
> MREG : region the particle is coming from
> NEWREG : region the particle is going to
> MMAT : material the particle is coming from
> MMATNW : material the particle is going to
> Function FRGHNS can be used to return a non-zero value for the roughness
> of a boundary between two materials, relevant for optical photon transport
> (default roughness is zero for all boundaries).
>
> Perhaps, it must be U_SRFC because it defines new direction. What are the
> values of roughness at the output?Could someone (more experienced) explain
> me more clearly about this?I'll be grateful for help.
> Best regards,
> Viktor Rodin
>
>
>


__________________________________________________________________________
You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info
Received on Thu Jun 08 2017 - 13:56:40 CEST

This archive was generated by hypermail 2.3.0 : Thu Jun 08 2017 - 13:56:41 CEST