A model code for the radiative theta pinch

Abstract

A model for the theta pinch is presented with three modelled phases of radial inward shock phase, reflected shock phase, and a final pinch phase. The governing equations for the phases are derived incorporating thermodynamics and radiation and radiation-coupled dynamics in the pinch phase. A code is written incorporating correction for the effects of transit delay of small disturbing speeds and the effects of plasma self-absorption on the radiation. Two model parameters are incorporated into the model, the coupling coefficient f between the primary loop current and the induced plasma current and the mass swept up factor f m. These values are taken from experiments carried out in the Chulalongkorn theta pinch. V

Simulation on formation process of field-reversed configuration

“…The width of this shock wave region is less than that of the induced current layer. This shock wave also shrinks inward with a relatively faster speed [25,26].…”

“…Figure 6 shows that a layer of plasma current is induced at the top boundary with the change of coil current at the beginning (t 1.25 μs). As the induced current layer moves inward, a shock wave is induced in front of the current layer with a smaller amplitude [25]. The width of this shock wave region is less than that of the induced current layer.…”