Velocity relaxation of injected H/sup 0/ particles into a high-temperature hydrogen plasma

The velocity relaxation of an H/sup 0/ beam injected into high-temperature plasma is analyzed by deriving a Fokker-Planck-type equation. The diffusion rate in the velocity space of an H/sup 0/ particle is directly proportional to the plasma temperature. Thus the effective energy relaxation of the H/sup 0/ 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.<
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