SPECSOUR

    defines one of the following special sources:
       - two colliding beams
       - Galactic Cosmic Rays
       - Solar Particle Event
       - synchrotron radiation
       - USRBIN as source
       - multiple beams

    See also BEAM, BEAMAXES, BEAMPOSit, GCR-SPE, HI-PROPErt, POLARIZAti, SOURCE,
    USRICALL, USRGCALL, SPOTBEAM, SPOTPOS, SPOTDIR, SPOTTRAN, SPOTTIME

    This command allows to input up to 18 double precision parameters, depending
    on the option specified by 
SDUM
. A first continuation card, if required, is
    marked by a "&" in any position in column 71 to 78, or in the last field if
    free format is used. A possible second continuation card is similarly marked
    by "&&".

    For 
SDUM
 = PPSOURCE or ppsource, or CROSSASY or CROSSSYM, the source is
    produced by two colliding beams.
    The description of these options is presented separately in Chapter 15}.

    Cosmic ray sources are requested by one of the following 
SDUM
 values:
    Galactic Cosmic Rays: GCR-AMS, GCR-IONF, GCR-SPEC, GCR-ALLF
    Solar Particle Events: SPE-SPEC, SPE-2003, SPE-2005
    The description of these options is presented separately in Chapter 16}.

    For 
SDUM
 = SYNC-RAD, SYNC-RDN, SYNC-RAS, SYNC-RDS the source consists in 
    synchrotron radiation photons produced by a charged particle travelling 
    in a magnetic field. A description of this option is presented separately
    in Chapter 17}.

    For 
SDUM
 = BEAMSPOT, the source consists of multiple beam spots. The user
    defines though the cards SPOTBEAM, SPOTPOS, SPOTDIR, SPOTTIME and SPOTTRAN
    the locations, directions, time intervals, transformation and beam 
    characteristics of those sources. 
    In this case, the card needs as 
WHAT(1)
 the number of beam spots that are 
    used. The user can define up to 50000 beam spots.

    
WHAT(1)
 >= 0.0 : Number of beam spots in the simulation
            <  0.0 : The code stops

    
WHAT(2)
 <= 0.0 : The beam spots are sampled randomly, according
                     to their weights 
             = 1.0 : The beam spots are sampled sequentially each with a number of
                     primaries proportional to its weight
             = 2.0 : The beam spots are sampled sequentially, all with
                     the same number of primaries, ignoring their weights

    If 
SDUM
 = BIN-SOUR, a USRBIN detector is used to define the spatial
    distribution of the primaries. The primary type is still defined
    through the BEAM card.
    Nota Bene :
      - The type of particles scored in the USRBIN is irrelevant to
        the primaries being launched through BIN-SOUR.
      - This option can only be used with a cartesian USRBIN.

    
WHAT(1)
 = Logical unit in which to read the USRBIN file

    
WHAT(2)
 = Detector index in the specified USRBIN file

    
WHAT(3)
 = Rotation translation matrix to be applied before sampling

    
WHAT(4)
 = Rotation translation matrix to be applied after sampling

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