The version in use within CASPER has been heavily modified and now allows for the tracking of electrostatic forces between grains, charge rearrangement along fractal aggregates, Debye shielding of grains within dusty plasmas, the inclusion of planetary magnetic fields via spherical harmonic expansions and the inclusion of the gravitational potentials of shepherding moons in ring/disk studies. This provides researchers within the Center extensive modeling capabilities for coagulation calculations including both fractal geometries and dynamic charge allocation along fractal fingers. Additionally, Coulomb crystal models in both 2 and 3 dimensions for bounded (periodic and aperiodic) and unbounded conditions are also being investigated. The code is presently undergoing modifications which will allow investigation into EM energy transfer through dusty plasmas as well as advanced gravitoelectrodynamics studies.
The Box_Tree code, written by Derek Richardson, is available for a number of operating systems including VMS, Sun, and Linux. Additional capabilities using specialized 5th order Runga-Kutta methods are also available.