FLUKAFIX

     Sets the size of the step of muons and charged hadrons to a fixed
     fraction of the kinetic energy in different materials

     See also EMFFIX, MULSOPT, STEPSIZE

     
WHAT(1)
 = fraction of the kinetic energy to be lost in a step
               (cannot be > 0.2)
               
Default
: if option DEFAULTS is used with 
SDUM
 = ICARUS, the
                        default is 0.02.
                        With 
SDUM
 = HADROTHErapy or PRECISIOn, the default
                        is 0.05.
                        If 
SDUM
 = CALORIMEtry, the default is 0.08.
                        With any other 
SDUM
 value, or if DEFAULTS is missing,
                        the default is 0.1.

     
WHAT(2)
 = "epsilon" parameter used to check the finite size of the
               nucleus when the nuclear form factor is not invoked by
               the multiple scattering algorithm (see Note 3 below)
               For code development only, do not change!
               
Default
 = 0.15

     
WHAT(3)
 = high-energy limit for the fraction of energy to be lost
               in a step (the fraction is given by 
WHAT(3)
 times 
WHAT(1)
)
               For code development only, do not change!
               
Default
 = 0.012

     
WHAT(4)
 = lower index bound (or corresponding name) of materials where
               the specified energy loss per step is to be applied
               (From material 
WHAT(4)
...)
               
Default
 = 3

     
WHAT(5)
 = upper index bound (or corresponding name) of materials where
               the specified energy loss per step is to be applied
               (... to material 
WHAT(5)
...)
               
Default
 = 
WHAT(4)

     
WHAT(6)
 = step length in assigning indices
               (...in steps of 
WHAT(6)
)
               
Default
 = 1

     
SDUM
 :   not used

     
Default
 (option FLUKAFIX not given): the defaults listed above apply

    
Notes:
        1) Usually there is no need for changing the general default value of
           10% (0.1) for 
WHAT(1)

        2) The input value is actually applied as such only at intermediate
           energies (between about a few tens of MeV and 1 GeV): at low energies
           it is slowly increased to twice the requested value, while at high
           energies it decreases to a limit usually about one hundredth of the
           input value.

     Example (number based):

 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
 FLUKAFIX        0.03        0.        0.       21.        0.        0.
 *  The maximum fractional energy loss for hadrons and muons is set to
 *  3 percent in material 21.

     The same example, name-based:

 FLUKAFIX        0.03        0.        0.   CALCIUM        0.        0.

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