Class EMPairProduction

Defined in File EMPairProduction.h

Inheritance Relationships

Base Type

public Module (Class Module)

Class Documentation

class EMPairProduction : public Module 

Electron-pair production of photons with background photons.

This module simulates electron-pair production of cosmic ray photons with background photons: gamma + gamma_b –> e+ + e- (Breit-Wheeler process). The resulting electron positron pair is optionally created (default = false). The module limits the propagation step size to a fraction of the mean free path (default = 0.1). Thinning is available. A thinning of 0 means that all particles are tracked. For the maximum thinning of 1, only a few representative particles are added to the list of secondaries. Note that for thinning>0 the output must contain the column “weights”, which should be included in the post-processing.

Public Functions

EMPairProduction(ref_ptr<PhotonField> photonField, bool haveElectrons = false, double thinning = 0, double limit = 0.1)

Constructor

Parameters

photonField – target photon field
haveElectrons – if true, add secondary electrons as candidates
thinning – weighted sampling of secondaries (0: all particles are tracked; 1: maximum thinning)
limit – step size limit as fraction of mean free path

void setPhotonField(ref_ptr<PhotonField> photonField)

void setHaveElectrons(bool haveElectrons)

void setLimit(double limit)

Limit the propagation step to a fraction of the mean free path

Parameters: limit – fraction of the mean free path

void setThinning(double thinning)

Apply thinning with a given thinning factor

Parameters: thinning – factor of thinning (0: no thinning, 1: maximum thinning)

void setInteractionTag(std::string tag)

set a custom interaction tag to trace back this interaction

Parameters: tag – string that will be added to the candidate and output

std::string getInteractionTag() const

void initRate(std::string filename)

void initCumulativeRate(std::string filename)

void performInteraction(Candidate *candidate) const

virtual void process(Candidate *candidate) const

virtual std::string getDescription() const

void setDescription(const std::string &description)

inline void process(ref_ptr<Candidate> candidate) const

inline size_t addReference() const

inline size_t removeReference() const

inline int removeReferenceNoDelete() const

inline size_t getReferenceCount() const

Protected Attributes

mutable size_t _referenceCount