Physics configuration options. More...

#include <PhysicsParams.hh>

Public Attributes
real_type	secondary_stack_factor {3}

bool	disable_integral_xs {false}

size_type	spline_eloss_order {1}

Range calculation
real_type	fixed_step_limiter {0}

Energy loss
real_type	min_eprime_over_e {0.8}

real_type	linear_loss_limit {0.01}

Multiple scattering
real_type	lambda_limit {real_type{1} * units::millimeter}

real_type	safety_factor {0.6}

Particle-dependent parameters
ParticleOptions	light {ParticleOptions::default_light()}

ParticleOptions	heavy {ParticleOptions::default_heavy()}

Detailed Description

Physics configuration options.

Input options are:

fixed_step_limiter: if nonzero, prevent any tracks from taking a step longer than this length.
min_eprime_over_e: energy scaling fraction used to estimate the maximum cross section over the step in the integral approach for energy loss processes.
linear_loss_limit: if the mean energy loss along a step is greater than this fractional value of the pre-step kinetic energy, recalculate the energy loss.
lambda_limit: limit on the MSC mean free path.
safety_factor: used in the MSC step limitation algorithm to restrict the step size to \( f_s s \), where \( f_s \) is the safety factor and \( s \) is the safety distance.
secondary_stack_factor: the number of secondary slots per track slot allocated.
disable_integral_xs: for particles with energy loss processes, the particle energy changes over the step, so the assumption that the cross section is constant is no longer valid. By default, many charged particle processes use MC integration to sample the discrete interaction length with the correct probability. Disable this integral approach for all processes. spline_eloss_order: the order of interpolation to be used for the spline interpolation. If it is 1, then the existing linear interpolation is used. If it is 2+, the spline interpolation is used for energy loss using the specified order. Default value is 1.

The documentation for this struct was generated from the following file:

Public Attributes