Numerical modeling of alpha-particle deposition in a field reversed configuration.

摘要

We present a particle model to calculate fractional alpha deposition for field reversed configuration (FRC) targets, which is important for estimation of the ignition parameter space for magnetoinertial fusion. For either high densities or high magnetic fields, the fractional deposition asymptotically approaches 1. In the low magnetic field, low density limit, the fractional deposition was linear with density. Deposition rises sharply with magnetic field between these two extremes.;The ignition region was studied using Lindl-Widner diagrams. We found that the alpha Larmor radius has to be small compared with the target radius for ignition. The ignition space peaks for a target to Larmor radius ratio of ∼10. Our model can be used as a basis for further development of deposition models for other targets. Additional insights can be gained with further exploration of the ignition space with Lind1-Widner diagrams using our alpha deposition model.