Hi Viktor,
I can’t really reproduce the plot you show.
I would completely change the block:
| OPT-PROP 1.0E-5 2.8E-5 10.0E-5 VACUUM _at_LASTMAT WV-LIMIT
| OPT-PROP 1.0 HYDROGEN _at_LASTMAT METAL
| * AIR
| OPT-PROP AIR RESET
| OPT-PROP 1.0E-5 2.8E-5 10.E-5 AIR WV-LIMIT
| OPT-PROP 1.0 AIR METAL
| OPT-PROP 1.1 2.0E-7 2.0E-7
| * ALUMINIUM
| OPT-PROP ALUMINUM RESET
| OPT-PROP 1.0E-5 2.8E-5 10.E-5 ALUMINUM WV-LIMIT
| OPT-PROP 1.0 ALUMINUM METAL
| OPT-PROP 1. 2.0E-7 2.0E-7 ALUMINUM
| * SCINTILLATOR
| OPT-PROP LAB+PPO RESET
| OPT-PROP 1.0 LAB+PPO METAL
| OPT-PROD LAB+PPO CERE-OFF
| OPT-PROD 2.8E-5 1.0E-5 LAB+PPO 10.0SCINT-WV
| OPT-PROP 1.0E-5 2.8E-5 10.E-5 LAB+PPO WV-LIMIT
| OPT-PROP 1.5 2.0E-4 2.0E-3 LAB+PPO
| OPT-PROP 0.1 0.5 SENSITIV
into
| OPT-PROP 1.0E-5 2.8E-5 10.0E-5 VACUUM _at_LASTMAT WV-LIMIT
| * AIR
| OPT-PROP AIR RESET
| OPT-PROP 1.0E-5 2.8E-5 10.E-5 AIR WV-LIMIT
| OPT-PROP 1.1 2.0E-7 2.0E-7
| * ALUMINIUM
| OPT-PROP ALUMINUM RESET
| OPT-PROP 1.0E-5 2.8E-5 10.E-5 ALUMINUM WV-LIMIT
| OPT-PROP 0.0 ALUMINUM METAL
| * SCINTILLATOR
| OPT-PROP LAB+PPO RESET
| OPT-PROD LAB+PPO CERE-OFF
| OPT-PROD 2.8E-5 1.0E-5 LAB+PPO 10.0SCINT-WV
| OPT-PROP 1.0E-5 2.8E-5 10.E-5 LAB+PPO WV-LIMIT
| OPT-PROP 1.5 2.0E-4 2.0E-3 LAB+PPO
| OPT-PROP 0.1 0.5 SENSITIV
The question is do you need to set all the material as a metal with 0 reflection?
In addition you had completely wrong absorption and diffusion lenghts for the Aluminium. In the first approximation if you consider a material perfectly reflective you don’t really need them…
Best,
Vittorio
P.S. please keep the reply in the list.
> On 23 Nov 2016, at 19:58, Віктор Родін <viktor94_at_knu.ua> wrote:
>
> Dear Vittorio,
> Thank you for your help. I adjusted my INP, but still have some strange things. Photons leave the box, but after a few interactions with aluminum wall. Is it a contribution of diffusion?Could you tell me about variable Step(WHAT(6))?How does it affect?
>
> Regards
> Viktor
>
> 2016-11-23 1:19 GMT+02:00 Vittorio Boccone <dr.vittorio.boccone_at_ieee.org>:
> Hi Viktor,
> in the OPT-PROP with the METAL SDUM you need to place (1-r) where r is the reflectivity. Label in flair is misleading (should be 1-r instead).
> As you have WHAT(3)=0 your reflectivity is actually 1, thus the 100% reflectance of the surfaces.
>
> Best
> Vittorio
> > On 20 Nov 2016, at 22:11, Віктор Родін <viktor94_at_knu.ua> wrote:
> >
> > Dear FLUKA users and experts.
> > When I tried to simulate the optical photons I noticed a problem with their propagating in my geometry. I was confused from the fact that If set reflectivity for all materials equal 0, optical photons anyway reflected from walls. Could you help me to decide this problem?INP file is attached.
> > Cheers
> > Viktor
> > <OP3.inp>
>
>
> <OP3.inp><photons.png><photons2.png><photons3.png>
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Received on Wed Nov 23 2016 - 23:38:18 CET