This keyword is used to start the loop construct in the input file. npulse is the number of times that the keywords between PULSE and ENDPULSE are repeated. Using FISPACT-II it is possible to nest this pair of keywords to an arbitrary depth, and there is now no limit on npulse for any loop. This facility is included so that a series of identical pulses (off time and on time) can be represented easily in the input file.
< -- Control phase -- > ... FISPACT * Title of the simulation < -- Initial phase -- > ... < -- Inventory phase -- > ... PULSE 5 FLUX 1.0E10 TIME 1.0 HOURS ATOMS FLUX 0.0 TIME 1.0 HOURS ATOMS ENDPULSE ...