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NSTX Team Meeting - Physics Analysis November 25, 2003

NSTX Team Meeting - Physics Analysis November 25, 2003. C.K. Phillips and S. Kaye. Transport Studies. NSTX kinetic stability analysis: Work has begun on examining the effect of non-reversed central shear on ITG, TEM and ETG modes in NSTX high density H-modes with GS2 (Redi)

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NSTX Team Meeting - Physics Analysis November 25, 2003

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  1. NSTX Team Meeting - Physics AnalysisNovember 25, 2003 C.K. Phillips and S. Kaye

  2. Transport Studies • NSTX kinetic stability analysis: • Work has begun on examining the effect of non-reversed central shear on ITG, TEM and ETG modes in NSTX high density H-modes with GS2 (Redi) • Neoclassical Theory: • Modifications to neoclassical theory to include finite banana effects (Wang) and FLR effects (Gates / White) being formulated • Portions of modified formulations (Wang) ready to be tested with NSTX data • Transport Analysis • Error analysis of local transport coefficients conducted to identify regions of high and low confidence (Kaye and LeBlanc) • Collaboration started with W. Horton to study electron critical gradient physics (LeBlanc)

  3. HHFW Heating and CD Modeling • TRANSP & CURRAY Package : • HHFW CD profiles are currently being integrated into the poloidal field diffusion solver in TRANSP (Kumar and Mau) • Generalization of adjoint package to include both toroidal effects and DC electric fields effects under consideration (Mau) • TORIC code development: • Code being generalized to include non-Maxwellian species in plasma dielectric response (Okuda and Phillips; Wright and Bonoli; RF SciDAC project) • Stand-alone version of TORIC which has been generalized for HHFW studies and which uses EFIT equilibria to be installed on PPPL cluster (Wright) • PPPL version to be benchmarked against PSFC-MIT version using NSTX test case (Wright, Bonoli and Phillips)

  4. HHFW Heating and CD Modeling……. • CQL3D for HHFW studies: • S. Bernabei and C. Kessel will work with R. Harvey on analysis and predictive simulation of HHFW and NBI experiments in NSTX • Code will be upgraded to include more cyclotron harmonics in a given simulation (currently code retains 3 harmonics per simulation) (R. Harvey) • CQL3D for EBW studies: • Interface routines between data input, CQL3D and GENRAY to be streamlined (R. Harvey) • Journal article in EBW heating and CD simulations in preparation (Harvey and Taylor) • Improved model for radial transport to be incorporated into CQL3D over next 6 months (R. Harvey in collaboration with Y. Peysson, CEA - Cadarache)

  5. Equilibrium Studies • FLOW code • Plans to benchmark FLOW code against new EFIT with rotation under discussion (L. Guazzotto, J. Manickam, S. Kaye, S. Sabbagh) • EFIT improvements continue -- see next slide

  6. Exact rotation solution fitting total and dynamic plasma pressure at (R, Z=0) A few thousand shot*times run Estimate for Pfast Stored energy with/without Vf = +/- 3% (Rpmax– Raxis)/a = 8% Significant drop in cmag2 and cp2 even though 50% more P channels and smaller error bars 40 2 30 20 Pkinetic (kPa) 1 10 0 0 0.5 1.0 1.5 2.0 0 R(m) 5 108420 t = 0.403 s 4 -1 3 Pdynamic (kPa) 2 1 -2 0 0.5 1.0 1.5 2.0 0.8 1.0 1.2 1.4 1.6 R(m) R(m) NSTX EFIT reconstructions now use Ti, Zeff profiles, and fit to plasma toroidal rotation Poloidal flux and pressure Z(m)

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