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Draft outline for “Recent Physics Results from the National Spherical Torus”

Draft outline for “Recent Physics Results from the National Spherical Torus”. IAEA overview OV/2-4 Last talk in morning session - Tuesday, 10/17 Just before coffee break, expect full attendance  25 mins total  16-18 viewgraphs Outline presented here  20 viewgraphs. MHD – 4 slides.

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Draft outline for “Recent Physics Results from the National Spherical Torus”

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  1. Draft outline for “Recent Physics Results from the National Spherical Torus” • IAEA overview OV/2-4 • Last talk in morning session - Tuesday, 10/17 • Just before coffee break, expect full attendance  • 25 mins total  16-18 viewgraphs • Outline presented here  20 viewgraphs

  2. MHD – 4 slides • Active RWM stabilization (Sabbagh) • Methodology, compare to DIII-D, extrapolate to ITER • NTV theory validation (Zhu/Sabbagh) • Theory description, comparison to expt for n=1,3 hi/low bN • RWM critical rotation physics (Sontag) • Scalings with VA, collisionality, q, etc. • Error field ID and correction (Menard) • Coil motion – relevant to ITER? • Size scaling of LM threshold for ITER (?)

  3. Transport – 4 slides • Confinement scaling studies (Kaye) • BT scaling controlled by electrons • IP scaling controlled by ions • GTC neo – NC ion thermal diffusivity vs. NCLASS • ETG modeling – Kim… or GYRO from Mikkelsen? • RS vs. “monotonic” L-mode (Levinton/Yuh) • Chi-e vs q-shear, or other – do we have a story? • Smith/Park – High-k measurements • Transient transport response (Stutman) • SXR diagnostic + pellet perturbations • Profile stiffness, critical gradient physics

  4. Boundary (3 slides) • Intermittent filament physics/recipr. probe (Boedo) • Density blobs & holes, intermittency • Blob modeling (Myra & Maqueda) • Partial div. detachment, radiative divertor (Vlad) • Heat fluxes, impact of D2 injections on performance • Pedestal structure vs. aspect ratio (Maingi) • need edge MPTS channels • Quartz microbalance data (Skinner) • extrapolation to tritium retention for ITER

  5. ISD/Hybrid Physics (3 slides) • MHD effect on current redistribution • Current profile / MHD analysis (Menard) • Effect on fast ion distribution function • Neutron rate and NPA (Medley) • SSNPA (Liu) • Effect of lithium on profiles/performance • Projections to higher fNI? • Shape control improvements/benefits • ELM size vs. controlled magnetic balance • High elongation control – implications for ST

  6. Fast ion physics (3 slides) • TAE structure and dynamics • Mode w, dn from reflectometer (Crocker) • Compare to theory M3D/NOVA-K Fu/Gorelenkov • 3-wave coupling (EPMs, TAEs and CAEs/GAEs) • Hole-clump physics (Berk/Breizman theory) • HHFWno impact on fishbone or chirping TAE • Does have impact on continuous TAE (Heidbrink) • NBI + HHFW  CQL3D  fast-ion distribution • More recent discharges/analysis with MSE (Eric)

  7. Ramp-up/Start-up (3 slides) • HHFW heating physics (Hosea/Wilgen) • Improvements with higher B, higher k-parallel • PDI – compare reflectometer vs. Langmuir • HHFW/NBI into low IP plasma (Kessel) • High fBS during HHFW H-mode • Transient CHI improvements (Raman) • 160kA closed flux • Fast camera images + reconstructions • X. Tang modeling – projections to higher IP

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