Moskvitin A. Drift mechanisms of energetic charged particles losses from tokamak-reactor plasmas

The thesis is devoted to a theoretical study of drift mechanisms of energetic charged particles losses from tokamak-reactor plasmas. These particles are assumed to be produced in nuclear fusion reactions. There are two loss mechanisms considered in the thesis: first orbit losses and resonant collisional diffusion in rippled magnetic field. The analytical model of the axasymmetric magnetic field in tokamak and model of the first orbit losses are improved in the thesis.The numerical model of motion of charged particle in tokamak with noncircular cross section of magnetic surfaces is developed using full orbit aproach. As a result of study folowing conclusions were done: 1) improved model of the first orbit losses can be used for analysis of losses of energetic ions; 2) the description of the resonant particle diffusion using "effective" Hamiltonian model should be done taking into account nonlinear terms on magnetic field ripple amplitude.