I had another question regarding the geometry definition of Fluka. Is there any equivalent to KZ or K/Z (conical surface) of PHITS to Fluka? I could not see any. I had to use the QUA (arbitrary surface) and define the parameters manually.
Dear @Rajarshi,
Depending on your case the use of truncated cones may also be suitable (see the corresponding page in the manual: 8.2.4.6. TRC — FLUKA Manual). Otherwise QUA is certainly an option.
Best,
Davide