Thank you very much for the excellent answer and advice.
While I have a quick question, how to access and use USDRAW and LTRACK through the user interface FLAIR?
I checked the manual and .f files in FLUKA, it seems that there is no USDRAW. Is it a fortran (or function?) file for USRDUMP? I am a beginner with fortran coding but I would like to have a try if it is. Thanks a lot.
USDRAW is indeed an entry in the user routine mgdraw.f, which you find in the distribution package under src/user/.
You may want to refer to Working with user routines | The official CERN FLUKA website for a first immersion and to understand the principle behind user routines, and further to slide 29 of
to see how to proceed in Flair. You’ll need a USERDUMP card in your input file (see the manual).
Thank you so much, Cesc. I am going to have a look that.