Finite Larmor radius equations in an arbitrary near-theta pinch geometry

A set of fluid-like equations is derived which describes the stability of a diffuse, high β, arbitrary, near-ϑ pinch configuration. The equations simultaneously include geometric effects which drive ideal magnetohydrodynamic instabilities and kinetic effects which give rise to finite Larmor radius stabilization. A simple heuristic procedure is given for determining these equations in addition to a full derivation starting from basic principles.