celeritas::ParticleOptions Struct Reference

Particle-dependent physics configuration options. More...

#include <PhysicsParams.hh>

Public Types
using	Energy = units::MevEnergy

Static Public Member Functions
static ParticleOptions	default_light ()
	Default options for light particles (electrons/positrons)
static ParticleOptions	default_heavy ()
	Default options for heavy particles (muons/hadrons)

Public Attributes
Range calculation
real_type	min_range
real_type	max_step_over_range
Energy loss
Energy	lowest_energy
Multiple scattering
bool	displaced
real_type	range_factor
MscStepLimitAlgorithm	step_limit_algorithm

Detailed Description

Particle-dependent physics configuration options.

These parameters have different values for light particles (electrons/positrons) and heavy particles (muons/hadrons).

Input options are:

• min_range: below this value, there is no extra transformation from particle range to step length.
• max_step_over_range: at higher energy (longer range), gradually decrease the maximum step length until it's this fraction of the tabulated range.
• lowest_energy: tracking cutoff kinetic energy.
• displaced: whether MSC lateral displacement is enabled for e-/e+
• range_factor: used in the MSC step limitation algorithm to restrict the step size to \( f_r \cdot max(r, \lambda) \) at the start of a track or after entering a volume, where \( f_r \) is the range factor, \( r \) is the range, and \( \lambda \) is the mean free path.
• step_limit_algorithm: algorithm used to determine the MSC step limit.

NOTE: min_range/max_step_over_range are not accessible through Geant4, and they can also be set to be different for electrons, mu/hadrons, and ions (they are set in Geant4 with G4EmParameters::SetStepFunction()).

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

• PhysicsParams.hh