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Author(s):
Alexander.A. Shishkin
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Title:
Estafette of Drift Resonances, Stochasticity and Control of Particle Motion in a Toroidal Magnetic Trap
Date of publication:
Feb. 2001
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Key words:
drift resonance, drift islands, stochasticity, control of high energy particles
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Abstract:
A new method of particle motion control in toroidal magnetic traps with rotational transform using the estafette of drift resonances and stochasticity of particle trajectories is proposed. The use of the word "estafette" here means that the particle passes through a set of resonances in consecutive order from one to another during its motion. The overlapping of adjacent resonances can be moved radially from the center to the edge of the plasma by switching on the corresponding perturbations in accordance with a particular rule in time. In this way particles (e.g. cold alpha-particle) can be removed from the center of the confinement volume to the plasma periphery. For the analytical treatment of the stochastic behaviour of particle motion the stochastic diffusion coefficients D_(r,r), D_(r,9), D_(9,9) are introduced. The new approach is demonstrated by numerical computations of the test helium particle trajectories in the toroidal trap Large Helical Device.
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