Multi-particle/event simulation. More...

#include <ActsFatras/Kernel/Simulation.hpp>

Public Member Functions
	Simulation (charged_simulator_t &&charged_, neutral_simulator_t &&neutral_)
	Construct from the single charged/neutral particle simulators.
template<typename generator_t, typename input_particles_t, typename output_particles_t, typename hits_t>
Acts::Result< std::vector< FailedParticle > >	simulate (const Acts::GeometryContext &geoCtx, const Acts::MagneticFieldContext &magCtx, generator_t &generator, const input_particles_t &inputParticles, output_particles_t &simulatedParticlesInitial, output_particles_t &simulatedParticlesFinal, hits_t &hits) const
	Simulate multiple particles and generated secondaries.

Public Attributes
charged_simulator_t	charged
	Simulator for charged particles.
neutral_simulator_t	neutral
	Simulator for neutral particles.
charged_selector_t	selectCharged
	Selector for charged particle simulation.
neutral_selector_t	selectNeutral
	Selector for neutral particle simulation.

Detailed Description

template<typename charged_selector_t, typename charged_simulator_t, typename neutral_selector_t, typename neutral_simulator_t>
struct ActsFatras::Simulation< charged_selector_t, charged_simulator_t, neutral_selector_t, neutral_simulator_t >

Multi-particle/event simulation.

Template Parameters

charged_selector_t	Callable selector type for charged particles
charged_simulator_t	Single particle simulator for charged particles
neutral_selector_t	Callable selector type for neutral particles
neutral_simulator_t	Single particle simulator for neutral particles

The selector types for charged and neutral particles do not need to check for the particle charge. This is done automatically by the simulator to ensure consistency.

Constructor & Destructor Documentation

◆ Simulation()

template<typename charged_selector_t, typename charged_simulator_t, typename neutral_selector_t, typename neutral_simulator_t>

ActsFatras::Simulation< charged_selector_t, charged_simulator_t, neutral_selector_t, neutral_simulator_t >::Simulation	(	charged_simulator_t &&	charged_,
		neutral_simulator_t &&	neutral_ )

Construct from the single charged/neutral particle simulators.

Parameters

charged_	Simulator for charged particles
neutral_	Simulator for neutral particles

Member Function Documentation

◆ simulate()

template<typename charged_selector_t, typename charged_simulator_t, typename neutral_selector_t, typename neutral_simulator_t>

template<typename generator_t, typename input_particles_t, typename output_particles_t, typename hits_t>

Acts::Result< std::vector< FailedParticle > > ActsFatras::Simulation< charged_selector_t, charged_simulator_t, neutral_selector_t, neutral_simulator_t >::simulate	(	const Acts::GeometryContext &	geoCtx,
		const Acts::MagneticFieldContext &	magCtx,
		generator_t &	generator,
		const input_particles_t &	inputParticles,
		output_particles_t &	simulatedParticlesInitial,
		output_particles_t &	simulatedParticlesFinal,
		hits_t &	hits ) const

Simulate multiple particles and generated secondaries.

Parameters

geoCtx	is the geometry context to access surface geometries
magCtx	is the magnetic field context to access field values
generator	is the random number generator
inputParticles	contains all particles that should be simulated
simulatedParticlesInitial	contains initial particle states
simulatedParticlesFinal	contains final particle states
hits	contains all generated hits

Return values

Acts::Result::Error	if there is a fundamental issue
Acts::Result::Success	with all particles that failed to simulate

Warning: Particle-hit association is based on particle ids generated during the simulation. This requires that all input particles must have generation and sub-particle number set to zero.

Note: Parameter edge-cases can lead to errors in the underlying propagator and thus to particles that fail to simulate. Here, full events are simulated and the failure to simulate one particle should not be considered a general failure of the simulator. Instead, a list of particles that fail to simulate is provided to the user. It is the users responsibility to handle them.; Failed particles are removed from the regular output, i.e. they do not appear in the simulated particles containers nor do they generate hits.

This takes all input particles and simulates those passing the selection using the appropriate simulator. All selected particle states including additional ones generated from interactions are stored in separate output containers; both the initial state at the production vertex and the final state after propagation are stored. Hits generated from selected input and generated particles are stored in the hit container.