Date: Tue, 9 Oct 2018 09:59:02 +0000
Hello,
I'm very new to FLUKA and trying to learn by using very simple set-ups. One of these consists of an iron cylinder surrounded by vacuum and a 4GeV pencil proton beam irradiating it from one side (protons initially propagate along the cylinder's axis). I used USRBIN to also take a look at the fluence of the original protons inside the target and have the feeling that something is not OK. According to NIST/PSTAR (https://physics.nist.gov/PhysRefData/Star/Text/PSTAR.html) the projected range of 4GeV protons in iron should be about 3m (2.495E+03g/cm² / 7.874g/cm³) but the fluence in the simulation shows practically no (beam) protons beyond approx. 2m (see attached image). I cannot find the reason for this(*). Any hints?
Thank you very much in advance for your support!
Best regards,
Serban Udrea
(*) Initially I thought that I wrote the wrong number in the input file, but this was not the case (the *.out file contains a line confirming the 4GeV kinetic energy).
-- Dr. Serban Udrea Researcher p-Linac/p-Bar-Target Phone: +49 6159 71 3356 Fax: +49 6159 71 3099 S.Udrea_at_gsi.de GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 1, 64291 Darmstadt, Germany, www.gsi.de Commercial Register / Handelsregister: Amtsgericht Darmstadt, HRB 1528 Managing Directors / Geschäftsführung: Professor Dr. Paolo Giubellino, Ursula Weyrich, Jörg Blaurock Chairman of the Supervisory Board / Vorsitzender des GSI-Aufsichtsrats: State Secretary / Staatssekretär Dr. Georg Schütte
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(image/png attachment: Screenshot_2018-09-28_17-32-29.png)