Dear Fluka experts,
I would like to simulate a photon beam based on a previous simulation (not from Fluka). I have an intensity matrix, when each element corresponds to the intensity in the area, say 500*500 nanometer. The beam itself is a plane beam (2D), about several millimeters on each side.
Following the presentation about user routine, I tried to understand how to perform the starting position sampling, and what is the most efficient way to perform it based on a matrix in Fluka.
Thank you in advance,