If the number of primaries in the start field of FLAIR (or in the text form of the input) is more than 1000000000 (1e9), FLUKA aborts with the message;
*** The 2th field 0 of the following input card ***
START 10000000000 30.0
*** does not contain a valid formatted fortran real number!!! ***
*** It is ambiguous and it could be read differently on different compilers ***
*** depending whether it defaults or not to the blank=0 formatted input rule ***
If I edit the text input file and provide the number of primaries as 10000000000.0 (1e10) and run with the rfluka command, FLUKA runs normally. I cannot however input the same number in the FLAIR window which does not allow decimal.
Also, I see that the number of primaries cannot be input as the E format (for example 1E6 or 1.0E6) as I get the same message.
Many of my cluster runs are timed and I may have to set the number of primaries to larger than 1e9. It will be useful to have this feature in FLAIR, which is used to create multiple inputs and clones.