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(UMI)AAI8815426 Engineering, Nuclear Ion Cyclotron Resonance Heating Induced Transport in Stellarators and Other Asymmetric Toroids Splitt, Edward Frank 2014-12-16T04:17:43Z 2014-12-16T04:17:43Z 10000-01-01 1988 1988 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. Made available in DSpace on 2014-12-16T04:17:43Z (GMT). No. of bitstreams: 1 8815426.pdf: 5556274 bytes, checksum: 10ed121023196b4e4078200009c5a44e (MD5) Previous issue date: 1988 Embargo set by: Seth Robbins for item 71079 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 216 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988. http://hdl.handle.net/2142/70913 text Nuclear Engineering Nuclear Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.