Theory and Simulation of Neoclassical Transport Processes, with Local Trapping
- Department of Physics, University of California at San Diego, La Jolla, CA USA 92093-0319 (United States)
Neoclassical transport is studied using idealized simulations that follow guiding centers in given fields, neglecting collective effects on the plasma evolution, but including collisions at rate {nu}. For simplicity the magnetic field is assumed to be uniform; transport is due to asymmetries in applied electrostatic fields. Also, the Fokker-Planck equation describing the particle distribution is solved, and the predicted transport is found to agree with the simulations. Banana, plateau, and fluid regimes are identified and observed in the simulations. When separate trapped particle populations are created by application of an axisymmetric squeeze potential, enhanced transport regimes are observed, scaling as {radical}({nu}) when {nu}<{omega}{sub 0}<{omega}{sub b} and as 1/{nu} when {omega}{sub 0}<{nu}<{omega}{sub b} where {omega}{sub 0} and {omega}{sub b} are the rotation and axial bounce frequencies, respectively. These regimes are similar to those predicted for neoclassical transport in stellarators.
- OSTI ID:
- 21300432
- Journal Information:
- AIP Conference Proceedings, Vol. 1114, Issue 1; Conference: Non-neutral plasma physics VII: Workshop on non-neutral plasmas 2008, New York, NY (United States), 16-20 Jun 2008; Other Information: DOI: 10.1063/1.3122274; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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