FLUKAFIX

Summary

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 (must not 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) =
“ \(\varepsilon\)” parameter used to check the finite size of the nucleus when the nuclear form factor​ is not invoked by the multiple scattering​ algorithm
For code development only, do not change the default!
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 the default!
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

= 3.0

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

= 1.0

SDUM

: not used

Default

(option FLUKAFIX not given): the defaults listed above apply. See also Table 7.1 at.


Notes

  1. Usually there is no need for changing the 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

    about \(\frac{1}{100}\) 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:

*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
FLUKAFIX        0.03        0.        0.   CALCIUM        0.        0.