# Class ParticleSplitting¶

## Inheritance Relationships¶

### Base Type¶

• public Module

## Class Documentation¶

class ParticleSplitting : public Module

Implements particle splitting, i.e. inverse thinning, to speed up the simulation.

After crossing a surface a given number of times, the particle is split to N partilces with weight 1/N. This eases performance constraints in acceleration simulations due to the power law nature of many acceleration mechanisms. Thanks to Matthew Weiss, Penn State University for the first work on this feature in 2017.

Public Functions

ParticleSplitting(Surface *surface, int crossingThreshold = 50, int numSplits = 5, double minWeight = 0.01, std::string counterid = "ParticleSplittingCounter")

surface The surface to monitor crossing_threshold Number of crossings after which a particle is split num_splits Number of particles the candidate is split into min_weight Minimum weight to consider. Particles with a lower weight are not split again. counterid An unique string to identify the particle property used for counting. Useful if multiple splitting modules are present.

void process(Candidate *candidate) const