Dear Daniela,
there is no way..sorry. The code initializes only restricted de/dx
tabulations, the delta-ray part is calculated runtime from cross section.
Regards
Paola
> Dear Paola and FLUKA experts,
>
> First of all, thank you very much for your reply.
>
> I tried to implement your suggestion by using the EMFCUT card but I
> believe I am still printing restricted stopping powers - and I need
> unrestricted stopping power values used by FLUKA. Please consider the
> figure below.
>
> First, I set the photon production threshold to a very high energy value
> and this approximated my curve to the NIST curve for high energies. The
> electron production threshold was set to 100 keV (red curve).
>
> Since I want to print unrestricted stopping powers, I then increased the
> electron production threshold to 10 MeV (yellow curve) and we can see that
> the values have better agreement to NIST. The problem is that with EMFFIX
> card I am only printing stopping powers for energies higher than the
> established threshold - and I also need stopping power values for low
> energies. How can I solve this problem?
>
> Please find attached the input file I am using for this simulation.
>
> Thank you very much.
> Best Regards,
> Daniela
>
> [cid:image002.jpg_at_01D4E4BB.25612DD0]
>
>
>
>
> From: paola sala <paola.sala_at_cern.ch>
> Sent: 22 March 2019 09:44
> To: Daniela Botnariuc <daniela.botnariuc_at_npl.co.uk>;
> fluka-discuss_at_fluka.org
> Subject: Re: [fluka-discuss]: Difference between FLUKA and NIST
> Unrestricted Electron Stopping Powers
>
> Dear Daniela,
> the DELTARAY cards controls delta ray production by hadrons and muons. It
> does not affect electron/positron transport.
> The "delta ray production" threshold for electrons is the same as the
> electron production threshold, and is set through
> the EMFCUT card with SDUM=PROD-CUT
>
> Thus, you are printing RESTRICTED energy loss by electrons/positrons, with
> a threshold that depends on the DEFAULT and EMFCUT cards
> you are using. This fully explains the supposed difference wrt NIST .
>
> Please look in the manual for further information.
>
> You can also have a look to the Ionization and Transport lectutr in the
> last fluka course
> https://indico.cern.ch/event/694979/contributions/2927124/attachments/1657653/2654330/Ionization_and_Transport_2018.pdf
>
> Have a nice day
> Paola
>
> On 3/21/19 4:36 PM, Daniela Botnariuc wrote:
> Dear FLUKA experts,
>
> I am simulating a proton beam in a water region where I am also
> considering secondary particles, including electrons. My goal is to print
> out the electron stopping power used by FLUKA and for that I activated the
> PRINT option in the EMFFIX card. To make sure I am getting unrestricted
> electron stopping powers, I set the DELTRARAY production threshold to
> infinite, so there is no delta ray production.
>
> I compared the stopping power values printed in the output file to the
> NIST unrestricted stopping powers and I find a large discrepancy as you
> can see in the figures below.
>
> Could someone explain why are these values so different? Am I simulating
> it wrong?
> I have been trying to understand this for some time and I would really
> appreciate any help.
>
> Best wishes,
> Daniela
>
> [cid:image004.jpg_at_01D4E4BB.25612DD0]
>
> [cid:image013.jpg_at_01D4E4BB.25612DD0]
>
>
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Paola Sala
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Received on Sun Mar 31 2019 - 18:42:14 CEST