Dear Agnieszka,
I set the ARGONHP density to 25 x the NTP one (see WHAT(3) of the MATERIAL card in the example of my previous email).
Since the density is > 0.01, FLUKA would have considered this material not as a gas anymore.
For this reason, one has to issue a MAT-PROP card with a pressure set to 25 (WHAT(1)) in order to specify to FLUKA that this material is indeed a gas at 25 atm.
Notes 1 and 2 of MAT-PROP card in the manual explain how the density is then used in the transport of charged particles and of the calculation of the stopping power.
Hope this clarify your question.
Best, luigi
On 25 Oct 2017, at 23:33, Agnieszka Witkowska <witkowskaagnieszka07_at_gmail.com<mailto:witkowskaagnieszka07_at_gmail.com>> wrote:
Dear Luigi,
Thank You. I have one more question regarding density of the gas material, as the same gas under different pressure has different density. How Fluka is treating density of the gas defined by MATERIAL card when there is also MAT-PROP card added with pressure value added? Is Fluka automatically converting the density of the material given in MATERIAL card?
Best regards,
Agnieszka
2017-10-25 8:46 GMT+02:00 Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch<mailto:luigi.salvatore.esposito_at_cern.ch>>:
Dear Agnieszka,
indeed the LOW-MAT card for ARGONHP was missing in your input file, as one could recognise by inspecting the end of the output file.
Also the MAT-PROP card was missing.
With the following cards, you should get the right definition of the material:
* ..+....1....+....2....+....3....+....4....+....5....+....6....+....7..
MATERIAL 18. .0415 40.ARGONHP
LOW-MAT ARGONHP 18. 40. 296. ARGON-40
MAT-PROP 25. ARGONHP
Note that I assigned the ARGONHP to the Ar-40 in the low-energy neutron library, since you explicitly referred to Ar-40 in your first email.
Best, luigi
On 24 Oct 2017, at 16:03, Agnieszka Witkowska <witkowskaagnieszka07_at_gmail.com<mailto:witkowskaagnieszka07_at_gmail.com>> wrote:
Dear Luigi,
My apologies, please the attached file.
Best regards,
Agnieszka
2017-10-24 15:56 GMT+02:00 Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch<mailto:luigi.salvatore.esposito_at_cern.ch>>:
Hi Agnieszka,
there was no attachment to your email.
Could you also keep the email exchange on the list?
Thanks, luigi
On 24 Oct 2017, at 15:44, Agnieszka Witkowska <witkowskaagnieszka07_at_gmail.com<mailto:witkowskaagnieszka07_at_gmail.com>> wrote:
Dear Luigi,
I added LOW-MAT card for argon but unfortunately code is still not working..... I attached my input file, only with ARGONHP added, without MAT-PROP card assigned to it.
Thank You for help!
Best regards,
Agnieszka
2017-10-24 14:11 GMT+02:00 Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch<mailto:luigi.salvatore.esposito_at_cern.ch>>:
Dear Agnieszka,
have you added the LOW-MAT card to associate ARGONHP to the corresponding low-energy neutron cross-sections?
If this does not solve your problem, could you possibly send the input file or a minimal version of it in order to reproduce the crash?
Thanks, luigi
> On 23 Oct 2017, at 22:43, Agnieszka Witkowska <witkowskaagnieszka07_at_gmail.com<mailto:witkowskaagnieszka07_at_gmail.com>> wrote:
>
> Dear Fluka Users,
>
> I encountered a problem using MAT-PROP card.
>
> I am simulating radioactive decay of the radium isotope and measuring the dose equivalent by USRTRACK card in high pressure ionization chamber in volume defined as sphere filled with argon.
>
> I was trying to apply by MAT-PROP card pressure of 25atm for argon, leaving other parameters as default ones. For that purpose I defined a new material with name "ARGONHP", with atomic number 18 and atomic weight 40 (the same as for default argon) and assigned it to MAT-PROP card and sphere filled with argon. Unfortunately, my simulation crashed, it is not running, even .err is not created.
>
> In order to find out if the problem is with MAT-PROP card or with the definition of MATERIAL card for new ARGONHP I removed MAT-PROP card and just left MATERIAL card for the new argon ARGONHP. Simulation crashed once again so my assumption is that the problem is with adding new material with the same atomic number and atomic weight as has the predefined one.
>
> Can You please advise if my assumption is correct? Can You please help me how to correctly assign 25atm for argon?
>
> Best regards,
> Agnieszka Witkowska
>
<Ra226_test8.inp>
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Received on Thu Oct 26 2017 - 10:20:28 CEST