Finite-Orbit Method for Dynamic Analysis of Mirror Fusion Systems

摘要

A model (FOREMD) is described which treats plasma buildup in small mirror fusion devices where finite gyroradius effects are important to the dynamic evolution of the density and energy profiles. An energy-dependent group technique is employed, but unlike conventional point-kinetic diffusion models, the local density is calculated by a summing over orbits passing through the volume of interest. This treatment is particularly important during buildup via neutral beam injection where charge-exchange losses near the surface affect the inner-volume density distribution through loss of large orbit ions. As an example of the use of FOREMD, buildup processes in two experimental devices (2X-IIB and TMX) are examined. (ERA citation 06:019513)