1. XGC simulation of CMOD edge plasmas
-0-
CMOD Ideas Forum, Dec , 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. 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)
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. 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

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

5. 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

6. 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

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