Ion Cyclotron Resonance Heating Induced Transport in Stellarators and Other Asymmetric Toroids
Splitt, Edward Frank
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https://hdl.handle.net/2142/70913
Description
Title
Ion Cyclotron Resonance Heating Induced Transport in Stellarators and Other Asymmetric Toroids
Author(s)
Splitt, Edward Frank
Issue Date
1988
Department of Study
Nuclear Engineering
Discipline
Nuclear Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Nuclear
Abstract
A Monte Carlo simulation is developed to model minority ion transport and fundamental ion cyclotron resonance heating (ICRH) in asymmetric magnetic field geometries. A discrete event model is used to superimpose resonance heated nonadiabatic changes in an ion's magnetic moment on a Coulomb scattering model that contains the Spitzer coefficients of drag, velocity diffusion, and pitch angle scattering (PAS). Ion drift orbit equations of motion are set in a magnetic flux coordinate system which separate fast motion along the field lines from slow motion across the lines.
The effects of ICRH on minority ion transport are investigated for helium-3 ions in stellarator plasmas. The energy distribution functions of these RF-heated ions develop high energy tails as a result of a preferential gain in velocity in the direction perpendicular to the ambient magnetic field. Estimates of neoclassical flux surface diffusion coefficients indicate that ion losses in a RF-heated stellarator plasma can be increased by as much as ten times non-ICRH ion losses. This can be attributed to an RF-increased fraction of trapped ions which results in increased neoclassical transport across the toroidal flux surfaces.
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