celeritas::GeantPhysicsOptions Struct Reference

Construction options for Geant physics. More...

#include <GeantPhysicsOptions.hh>

Public Types
using	MevEnergy = Quantity< units::Mev, double >

Static Public Member Functions
static GeantPhysicsOptions	deactivated ()
	Initialize with no physics.

Public Attributes
GeantMuonPhysicsOptions	muon {GeantMuonPhysicsOptions::deactivated()}
	Muon EM physics.
bool	verbose {false}
	Print detailed Geant4 output.
GeantOpticalPhysicsOptions	optical
	Optical physics options.
Gamma physics
bool	compton_scattering {true}
	Enable Compton scattering.
bool	photoelectric {true}
	Enable the photoelectric effect.
bool	rayleigh_scattering {true}
	Enable Rayleigh scattering.
bool	gamma_conversion {true}
	Enable electron pair production.
bool	gamma_general {false}
	Use G4GammaGeneral instead of individual gamma processes.
Electron and positron physics
bool	coulomb_scattering {false}
	Enable discrete Coulomb.
bool	ionization {true}
	Enable e- and e+ ionization.
bool	annihilation {true}
	Enable positron annihilation.
BremsModelSelection	brems {BremsModelSelection::all}
	Enable bremsstrahlung and select a model.
MevEnergy	seltzer_berger_limit {1e3}
	Upper limit for the Seltzer-Berger bremsstrahlung model.
MscModelSelection	msc {MscModelSelection::urban}
	Enable multiple coulomb scattering and select a model.
RelaxationSelection	relaxation {RelaxationSelection::none}
	Enable atomic relaxation and select a model.
Physics options
int	em_bins_per_decade {7}
	Number of log-spaced bins per factor of 10 in energy.
bool	eloss_fluctuation {true}
	Enable universal energy fluctuations.
bool	lpm {true}
	Apply relativistic corrections for select models.
bool	integral_approach {true}
	See PhysicsParamsOptions::disable_integral_xs.
Cutoff options
MevEnergy	min_energy {0.1 * 1e-3}
	Lowest energy of any EM physics process.
MevEnergy	max_energy {100 * 1e6}
	Highest energy of any EM physics process.
double	linear_loss_limit {0.01}
	See PhysicsParamsOptions::linear_loss_limit.
MevEnergy	lowest_electron_energy {0.001}
	Tracking cutoff kinetic energy for e-/e+.
MevEnergy	lowest_muhad_energy {0.001}
	Tracking cutoff kinetic energy for muons/hadrons.
bool	apply_cuts {false}
	Kill secondaries below the production cut.
double	default_cutoff {0.1 * units::centimeter}
	Set the default production cut for all particle types [len].
Multiple scattering configuration
double	msc_range_factor {0.04}
	e-/e+ range factor for MSC models
double	msc_muhad_range_factor {0.2}
	Muon/hadron range factor for MSC models.
double	msc_safety_factor {0.6}
	Safety factor for MSC models.
double	msc_lambda_limit {0.1 * units::centimeter}
	Lambda limit for MSC models [len].
double	msc_theta_limit {constants::pi}
	Polar angle limit between single and multiple Coulomb scattering.
double	angle_limit_factor {1}
	Factor for dynamic computation of angular limit between SS and MSC.
bool	msc_displaced {true}
	Whether lateral displacement is enabled for e-/e+ MSC.
bool	msc_muhad_displaced {false}
	Whether lateral displacement is enabled for muon/hadron MSC.
MscStepLimitAlgorithm	msc_step_algorithm {MscStepLimitAlgorithm::safety}
	Step limit algorithm for e-/e+ MSC models.
MscStepLimitAlgorithm	msc_muhad_step_algorithm
	Step limit algorithm for muon/hadron MSC models.
NuclearFormFactorType	form_factor {NuclearFormFactorType::exponential}
	Nuclear form factor model for Coulomm scattering.

Detailed Description

Construction options for Geant physics.

These options attempt to default to our closest match to G4StandardEmPhysics. They are passed to the EmPhysicsList and FtfpBert physics lists to provide an easy way to set up physics options.

Todo:

This will be moved to celeritas::inp

Rename default_cutoff to be consistent (it's a production cut)

Member Data Documentation

msc

MscModelSelection celeritas::GeantPhysicsOptions::msc {MscModelSelection::urban}

Enable multiple coulomb scattering and select a model.

Electron/positron MSC requires ionization

msc_muhad_step_algorithm

MscStepLimitAlgorithm celeritas::GeantPhysicsOptions::msc_muhad_step_algorithm

Initial value:

{
        MscStepLimitAlgorithm::minimal}

Step limit algorithm for muon/hadron MSC models.

optical

GeantOpticalPhysicsOptions celeritas::GeantPhysicsOptions::optical

Initial value:

{
        GeantOpticalPhysicsOptions::deactivated()}

Optical physics options.

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

• GeantPhysicsOptions.hh