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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