how to add up a magnetic filed?

Dear All:
     I am a new fluka learner and not very familiar with Fortran. I want to
calculate the deposition of protons on a CR-39 screen through a ring-like
magnetic field. As I know, I must set what(5) of the ASSIGNMAt card equal to 1
and use the user routine MAGFLD. But the user guide within the tar.gz file
only give a little description of the argument list. Could anyone give me a
more detail information of how to complete this job.
Merci beaucoup!
     Our magnetic field is B(r)=B0exp(-|r-R0|/Re), where B0 is the maximum
field, r is the distance apart from the ring-like axis(z axis), R0 and Re are
contants. The range along the z axis is Zm. I know that the .f file will
produce a executable finally. Do I execute this file directly or use $FLUPRO/
flutil/rfluka -N0 -M5 filename & to calculate the .inp file and let the rfluka
to call the final executable?
                                                                               
                                                   Have a nice day!!
                                                                               
                                                            dufei
Received on Tue Dec 16 2008 - 14:22:29 CET