XGC simulation of CMOD edge plasmas

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Presentation transcript:

XGC simulation of CMOD edge plasmas -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

XGC code 2006-2007 capabilities -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

Averaging over the fluctuations -2- Averaging over the fluctuations Ln ~ 1cm Density pedestal 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 o t=1i V|| t=4i

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

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

Possible 2007 Collaboration with C-Mod: -5- 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. D=1m2/s B drift

-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