Abstract
Effects of lower hybrid wave (LHW) heating on alpha particle confinement in a large tokamak such as TFTR are investigated numerically. By use of a single particle code which includes the interaction with LHW, the diffusion coefficients of the particles in real and magnetic moment spaces are evaluated. The characteristic feature of the wave-particle interaction is that the alpha particles interact with the wave almost whole poloidal cross-section due to their large Larmor radii. It is found that LHW heating causes spatial diffusion as well as velocity diffusion and the characteristic time of orbit loss due to the diffusion of the alpha particles with rather large banana width is of the order of or shorter than their slowing-down time.
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