I have a running Fluka simulation of a detector and a beam and now want to add also cosmics to see if my data analysis algorithm will be able to distinguish actual signals from the beam from signals from cosmics. I read through chapter 16 of the manual, but I fear I don’t understand fully what I really need to include in my existing file. I managed to create a .geo file from atmloc.f using the coordinates, but I also don’t know what the proper value for “geomagnetic cut-off acceptance” is, as well as the “topmost altitude for particle tracking”.
For my normal simulations (just beam + detector) I had a blackbody of just 1 m^3, do I need to extend this?
Based on the few information you provided, and from my understating of your problem, please find below some general consideration which hopefully may help you in setting-up your simulations.
Since you have successfully built a geometry using the atmloc.f (for simplicity I will call this geometry/input “GCR.inp”), the next step would be integrating your detector geometry into the the GCR.inp. The adaptation of the detector geometry into the GCR.inp will mainly depend from the final goal of your study, on which I cannot comment further.
With regard to the source term to use in the GCR simulation, there are many threads in this forum you may consult, in addition to Chapter 16 of the FLUKA manual. I link a few of them below.
In general, you set-up the GCR generation by using the SPECSOUR and the GCR-SPE cards and by using a series of *.spc files which provide the ion composition of the galactic flux from Z = 1 to Z = 28.