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START


    defines the termination conditions, gets a primary from a beam or
     from a source and starts the transport

    See also RANDOMIZe, STOP

     
WHAT(1)
= maximum number of primary histories simulated in the run
Default
= 5000.
WHAT(2)
= not used
WHAT(3)
= time left for termination and printout (in seconds)
Default
: 80
WHAT(4)
= 1.0 : a core dump is triggered when the built-in abort routine, FLABRT, is called
WHAT(5)
= 0.0 : a line reporting the number of calls to the random number generator (in hexadecimal form) is printed at the beginning of each history only for the first ones, and then with decreasing frequency > 0.0 : the number of calls is printed at the beginning of each history.
WHAT(6)
= time reserved for an interactive run (in seconds)
Default
: 100.0
SDUM
: not used
Default
(option START not given): the other input cards are read and an echo is printed on the standard output, but no actual simulation is performed. However two input cards, both related to geometry, have an effect even if no START card is present: GEOEND (with
SDUM
= DEBUG) and PLOTGEOM. In all cases in which particles are transported, START must ALWAYS be present.
Notes:
1) The interactive time limit indicated by
WHAT(6)
can be used only on some systems which can provide a signal when the time limit is approaching. On personal workstations, generally no time limit is enforced. 2) It is also possible to terminate a FLUKA run before the pre-set time has expired or the total number of histories has been completed. To this effect, the user may create a "stopping file" (its content is irrelevant, since only its existence is checked by the program). When the program detects the existence of such a file, the time left is set to zero, the run is terminated at the end of the current history, and the stopping file itself is erased. The name of the stopping file is fluka.stop or rfluka.stop on UNIX. While the presence of fluka.stop terminates only the current job, rfluka.stop also skips the successive jobs requested via the rfluka script.
Example:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
START 70000.0
* Request a run of 70000 primary particles

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