celeritas::UrbanMscParameters Struct Reference

Settable parameters and default values for Urban multiple scattering. More...

#include <UrbanMscData.hh>

Public Types
using	Energy = units::MevEnergy

Static Public Member Functions
static CELER_CONSTEXPR_FUNCTION real_type	dtrl ()
	Fraction of the range below which a step is assumed constant xs.
static CELER_CONSTEXPR_FUNCTION real_type	limit_min_fix ()
	The minimum value of the true path length limit: 0.01 nm.
static CELER_CONSTEXPR_FUNCTION real_type	limit_min ()
	Minimum true path when not calculated in the step limiting.
static CELER_CONSTEXPR_FUNCTION real_type	min_step ()
	For steps below this value, true = geometrical (no MSC to be applied)
static CELER_CONSTEXPR_FUNCTION Energy	min_sampling_energy ()
	Below this endpoint energy, don't sample scattering: 1 eV.
static CELER_CONSTEXPR_FUNCTION Energy	min_scaling_energy ()
	The lower bound of energy to scale the minimum true path length limit.

Public Attributes
real_type	tau_small {1e-16}
	small value of tau
real_type	tau_big {8}
	big value of tau
real_type	tau_limit {1e-6}
	limit of tau
real_type	safety_tol {0.01}
	safety tolerance
real_type	geom_limit {5e-8 * units::millimeter}
	minimum step
Energy	low_energy_limit {0}
Energy	high_energy_limit {0}

Detailed Description

Settable parameters and default values for Urban multiple scattering.

\( \tau = t/\lambda \) where t is the true path length and \( \lambda \) is the mean free path of the multiple scattering. The range and safety factors are used in step limitation algorithms and default values are chosen to balance between simulation time and precision.

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

• UrbanMscData.hh