Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
Neoclassical viscosities and cross-field particle and heat fluxes are presented for projected NCSX conditions. Calculations based on full 3-D magnetic configurations are compared with predictions for equivalent axisymmetric configurations and an analytic model for neoclassical helical transport. The transport matrix for 3-D configurations is based on monoenergetic diffusivities, obtained here from the DKES code, and from MOCA, a Monte Carlo orbit code. The pitch-angle-scattering collision operator does not conserve momentum, so we use a procedure proposed by Sugama to obtain the corrected transport parameters. The magnetic geometry of NCSX can be varied by changing the internal bootstrap currents and the independently driven currents in the external modular field coils. To obtain efficient estimates of the neoclassical transport for each new configuration, the monoenergetic diffusivities are represented with physically motivated basis functions. We also compare to predictions of the ambipolar radial electric field and the neoclassical helical particle and energy fluxes given by the analytic Shaing-Houlberg model (with an improved treatment of the \nu regime).