A solution method of slowing-down distribution of energetic particles in tokamaks

The eigen equation of pitch-angle distribution derived from the slowing-down with an energetic particle source term is solved by using Legendre series expansion method. An iteration matrix established when scattering terms become important. whole region separated into three parts, two passing regions, and one trapped area. for each finally obtained. method applied to solve equations that Maxwellian-like, neutral beam injection, radial drifts. functions are convergent different distribution. suitable solving a kinetic collision