Re: Optical Photon Production by Scintillator Material, need help

Hi Vahan,

Here are the issues with your input:

1) your source is at 20 MeV, and is isotropic. If you test it with a beam,
make sure its in the positive direction, and set the primaries lower as the
processing time is ~2 hrs on an i7 if it's made directional with your
current settings. Using the SENSITIV sdum on OPT-PROP you can probably
lower the OPT-PHOT production (and reduce CPU load) if you are trying to
make other measurements at the same time in your simulation.

2) when entering in the wavelengths for the OPT-PROP (sdum WV-LIMITS) cards
you want them in cm, they were all entered in as meters, you technically
don't need them to run the simulation

3) same issue with OPT-PROD (sdum SCINT-WV), it was also in meters. This
card is very much needed.

4) you explained you want an electron beam. But you have the source card
set to isotropic at 20 MeV. :-)

5) You need to set an appropriate upper and lower energy in the USRBDX card
for binning the optical wavelengths. I usually use 1E-9 to 1E-8 initially.

6) You may want to set an OPT-PROP (sdum blank) card to set an index of
refraction, absorption and diffusion coefficients. This will increase the
processing time per particle however.

Hope this helps.

--Nick

On Mon, Dec 10, 2012 at 7:11 AM, Vahan Petrosyan
<vpetrosyan_at_asls.candle.am>wrote:

> I want to get optical photons distribution (angular, energy) that
> irradiated by Yag screen ( scintillator material Yag(Ce) yttrium
> aluminum garnet ) via USRBDX card when electron beam with 5Mev energy
> hits it.
> http://www.detectors.saint-**gobain.com/uploadedFiles/**
> SGdetectors/Documents/Product_**Data_Sheets/YAG-Data-Sheet.pdf<http://www.detectors.saint-gobain.com/uploadedFiles/SGdetectors/Documents/Product_Data_Sheets/YAG-Data-Sheet.pdf>
>
> I want to define scintillator material properties with fluka using
> OPT-PROD card with SCINT-WV option but fluka gives an error.
> I have never done such kind of simulation and need experts help in order
> to do it correctly. I am attached my input file and ask you to look and
> say what I did wrong.
>
> btw. I played with parameters of my input file a little and switched on
> Cerenkov and Transition(TR-Radia) radiation and disable OPT-PROD card
> with SCINT-WV in order to get some results but USRBDX plot with option
> OPTIPHOT gives me an empty data range.
>
> can someone help me to define correct parameters for scintillator
> material Yag(Ce) and get correct distribution (angular, energy) of
> optical photons via USRBDX card?
> http://en.wikipedia.org/wiki/**Yttrium_aluminum_garnet<http://en.wikipedia.org/wiki/Yttrium_aluminum_garnet>
>
> Thanks!
>
>
Received on Tue Dec 11 2012 - 09:26:07 CET