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XGC Simulation of CMOD Edge Plasmas: First Principle Approach

Cutting-edge simulation model for CMOD edge plasmas, incorporating turbulence-neoclassical-neutral dynamics with detailed plasma variations and realistic geometry. Enables analysis and prediction of edge physics for fusion research. Collaboration opportunities with C-Mod for potential advancements.

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XGC Simulation of CMOD Edge Plasmas: First Principle Approach

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  1. -0- CMOD Ideas Forum, Dec. 13-15, 2006 XGC simulation of CMOD edge plasmas C.S. Changa, S. Kua and the CPES teamb aCourant Institute of Mathematical Sciences, NYU bUS DOE Fusion Simulation Prototype Center for Plasma Edge Simulation

  2. -1- XGC code • First principle simulation of the entire edge, including the self-consistent interaction of the turbulence-neoclassical-neutral dynamics. • Full-f ion, electron, neutrals • Realistic B geometry with X-point & wall (EFIT g_eqdsk) • Allow plasma variation along the field line • Heat flux from core and particle source from neutral ionization (Monte Carlo) 2006-2007 capabilities • Macroscopic 2D plasma and potential/rotation profiles in the edge after averaging out the fluctuations (2006) • Electrostatic turbulence spectrum is under analysis • Classical collision effects will be installed for NSTX

  3. -2- Density pedestal Ln ~ 1cm V|| t=4i o t=1i Averaging over the fluctuations • Solutions slowly vary from initial • profile • Complete toroidal and Local • poloidal averaging (<~10 cm) • to allow plasma variation along B • The first kinetic neoclassical • simulation in the edge

  4. -3- Gyrokinetic Particle Simulation of Particle motions In the edge

  5. -4- V|| (eV) Wall V||, DIII-D 1 N N Strongly sheared neoclassical V|| and VExB in the entire H-mode edge (no neutrals, turbulence suppressed) DIII-D, outside midplane

  6. -5- D=1m2/s B drift • Possible 2007 Collaboration with C-Mod: • Rotation source/boundary condition in the edge • Effect of Ballooned radial out-flow into scrape-off • In-out asymmetric potential/Flows observed • Start with a phenomenological D, but use self-consistent Dturb later.

  7. -6- Discussions • XGC-0 and XGC-1 can analyze (and predict) edge physics from first-principle kinetics • Neoclassical and neutral physics now • Electrostatic turbulence next year (followed by EM) • By validating the code using the experimentally measurable quantities, we can predict the un-measurable quantities and understand the underlying physics. • Possible 2007 Collaboration with C-Mod: • Rotation source/boundary condition in the edge • Effect of Ballooned radial out-flow into scrape-off

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