Test Case 4 -  Penning Spoke Benchmark

This test case corresponds to the radial-azimuthal simulation of the rotating spoke (macroscopic instability) in a collisionless Penning discharge with injection of electrons and ions from a central region.  The magnetic field is uniform and perpendicular to the simulation domain.

Organized by AT Powis, L Garrigues, G Fubiani, started August 2022