Velocity relaxation of injected H0 particles into a high-temperature hydrogen plasma

The velocity relaxation of an H⁰ beam injected into high-temperature plasma is analyzed by deriving a Fokker-Planck-type equation. The diffusion rate in the velocity space of an H⁰ particle is directly proportional to the plasma temperature. Thus the effective energy relaxation of the H⁰ beam in the high-temperature plasma would be expected. It is shown that the Fokker-Planck-type equation satisfies the Boltzmann H theorem in the absence of particle loss. The constant of time decay of the beam density due to ionization with plasma ions, the thermalizing effect, and a method of possible analysis of trapped ions are also discussed