SPOTTRAN

 The SPOTTRAN card is used in conjunction with SPOTBEAM, SPOTDIR, SPOTPOS,
 and SPOTTIME to define transformation of multiple beam spots.

 Warning : These five cards are activated only by indicating 
SDUM
 = BEAMSPOT
 in the SPECSOUR card. Barring this, the spot cards will be discarded.

 See also SPOTBEAM, SPOTDIR, SPOTPOS, SPOTTIME


    For no 
SDUM
 or 
SDUM
 = DIRECT or INVERSE:

    
WHAT(1)
 = index or name of the transformation to be applied to one
	          or more  beamlets
              A -99999 value means unit transformation, whichever
              other negative value resets to default
              Zero is ignored
              
Default
 : 0 - no transformation

    
WHAT(2)
 = index or name of a dummy transformation needed internally
	          by the code. This transformation must be defined, and never
			  used (it is internally overwritten)
              
Default
 : 0 - no transformation

    
WHAT(3)
 = not used

    
WHAT(4)
 = from spot number 
WHAT(4)
 ...
              
Default
 : 0

    
WHAT(5)
 = ... to spot number 
WHAT(5)
 ...
              
Default
 : 
WHAT(4)

    
WHAT(6)
 = ... in step of 
WHAT(6)
              
Default
 : 1

    
SDUM
 :    DIRECT : the WHAT(1/2) transformation is applied to the
              beam spot position and axes as well
              INVERSE: the WHAT(1/2) inverse transformation is applied
              to the beam spot position and axes
              no 
SDUM
: no transformation is applied to the beam spot
              position and axes
              
Default
 : no 
SDUM

     When a beam spot in the range indicated by WHAT(4/5/6) is
     selected the transformation indicated in 
WHAT(2)
 is overwritten
     by the one indicated in 
WHAT(1)
.  Please note that the
     transformation 
WHAT(2)
 is not restored after being overwritten

    For 
SDUM
 = BACKTRAC

    
WHAT(1)
 = flag for enabling/disabling back-tracing
              >=  1: back-tracing is enabled
              =< -1: back-tracing is disabled
              Zero is ignored
              
Default
 : 0 - no back-tracing

    
WHAT(2)
 = back-tracing distance (cm)
              for what(1)=1: the beam position and angular spread are
              generated backward according to the nominal beam direction
              as defined by SPOTDIR at the requested distance from the spot
              nominal position point as defined by SPOTPOS (eg to generate
              them at a beam optics waist) and then the resulting beam moved
              forward by the same distance.
              for what(1)=2: the beam position and angular spread are
              generated at the nominal spot point as defined by SPOTPOS
              (eg isocentre), then the beam is backtraced by a distance equal
              to what(2)
              
Default
 : 0 - no back-tracing distance

    
WHAT(3)
 = not used

    
WHAT(4)
 = from spot number 
WHAT(4)
 ...
              
Default
 : 0

    
WHAT(5)
 = ... to spot number 
WHAT(5)
 ...
              
Default
 : 
WHAT(4)

    
WHAT(6)
 = ... in step of 
WHAT(6)
              
Default
 : 1

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