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Application of GTC-Neo for NSTX Cases

Application of GTC-Neo for NSTX Cases. G. Rewoldt and W.X. Wang NSTX Results/Theory Review July 27, 2006. Introduction. GTC-Neo: Neoclassical  f particle-in-cell simulation code

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Application of GTC-Neo for NSTX Cases

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  1. Application of GTC-Neo for NSTX Cases G. Rewoldt and W.X. Wang NSTX Results/Theory Review July 27, 2006

  2. Introduction • GTC-Neo: Neoclassical f particle-in-cell simulation code • Refs.: W.X. Wang, et al., Comp. Phys. Commun. 164, 178 (2004); W.X. Wang, et al., PPPL-4156, Phys. Plasmas, to be published (2006) • Calculates radial fluxes of particles, momentum, & energy (heat), radial electric field, poloidal velocity, bootstrap current, etc., for numerically-calculated, non-circular MHD equilibrium • Currently single (hydrogenic) ion species; impurity species to be added in future ; input is ne(r), Ti(r), & MWA(r) • Generalization over standard neoclassical theory: finite orbit width, nonstandard orbits, self-consistent determination of Er - gives nonlocal transport, extra smoothing

  3. NSTX Application - qi • Have now done 19 NSTX cases (shots & times) • Normally calculate ion heat flux (qi), radial electric field, & ion poloidal velocity; compare to NCLASS, &, for qi, to experiment (TRANSP) • qi usually comparable to NCLASS results (but smoother), & sometimes closer to experiment • Results suggest nonlocal features for ion heat flux near magnetic axis, breaking local, linear gradient-flux relation Higher-BT comparison shot (B0=0.45 T) H-phase without ion ITB Reversed shear

  4. NSTX Application - Vpol & Er • Vpol from GTC-Neo usually larger than that from radial force balance (NCLASS) • However, Er from GTC-Neo not so different from that from radial-force-balance result, since p and Vtor contributions larger than Vpol contribution reversed shear monotonic q

  5. Conclusions • GTC-Neo now calculates neoclassical quantities, including finite-orbit-width effects and self-consistent Er, routinely for NSTX experimental cases - wide variety of results. Will explore more cases & compare to NCLASS & experiment • Also will be applying shaped-GTC code and GEM code for NSTX turbulence calculations, with realistic geometry, in future

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