2. Padian simulation code
For the numerical simulations, a Monte-Carlo code was used
to compute the parallel diffusion coefficient of energetic particles
for the turbulence model described above. A general description
of the code and the underlying numerical techniques
can be found elsewhere (Tautz 2010; Tautz & Dosch 2013).
Specifically, the isotropic and the slab turbulence models were
employed, which are defined via the wave vector of the (Fourier
transformed) turbulent magnetic field with random orientation
and aligned with the direction of the background magnetic field
(i.e., the z axis), respectively. The corresponding generation of
turbulent magnetic fields proceeded as (Tautz & Dosch 2013)