  The spherical proportional counter is a novel gaseous detector with numerous
applications, including direct dark matter searches and neutron spectroscopy.
The strengths of the Geant4 and Garfield++ toolkits are combined to create a
simulation framework for spherical proportional counters. The interface is
implemented by introducing Garfield++ classes within a Geant4 application.
Simulated muon, electron, and photon signals are presented, and the effects of
gas mixture composition and anode support structure on detector response are
discussed.
