| Numerical
Computation of Wave-Plasma Interactions in Multi-Dimensional
Systems
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| Figure
13 AORSA calculation of minority
ion cyclotron heating for all ten field periods of the
LHD (Large Helical Device) stellarator with a single antenna
located at the far right. Individual cross sections show
the logarithm of the minority ion power absorption at
various toroidal angles. |
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The goal of this research is to use advanced terascale computing
to obtain quantitatively accurate predictive understanding of
electromagnetic wave processes, which support important heating,
current drive, and stability and transport applications in fusion
plasmas.
Recently developed all-orders spectral algorithms (AORSA)
take advantage of new computational routines in ScaLAPACK
to solve the integral form of the wave equation in multiple
dimensions without any restriction on wavelength relative
to orbit size, and with no limit on the number of cyclotron
harmonics retained. These new models give high-resolution,
2D solutions for mode conversion and high harmonic fast wave
heating in tokamak geometry. In addition, they have been extended
to give fully 3D solutions of the integral wave equation for
minority ion cyclotron heating in stellarator geometry (Figure
13). By combining multiple periodic solutions for individual
helical field periods, it is possible to obtain complete wave
solutions valid over the entire volume of the stellarator
for arbitrary antenna geometry. This work is an initial step
toward multidimensional modeling of wave processes.
INVESTIGATORS
D. B. Batchelor, L. A. Berry, J. A. Carlsson, M. D. Carter,
E. F. Jaeger, and D. A. Spong, Oak Ridge National Laboratory;
C. K. Phillips, Princeton Plasma Physics Laboratory; P. T.
Bonoli, Massachusetts Institute of Technology; D. N. Smithe,
Mission Research Corp.; R. W. Harvey, CompX; D. A. D’Ippolito,
Lodestar Research Corp.
PUBLICATION
E. F. Jaeger, L. A. Berry, E. D’Azevedo, D. B. Batchelor,
M. D. Carter, K. F. White, and H. Weitzner, “Advances
in full-wave modeling of radio frequency heated, multidimensional
plasmas,” Phys. Plasmas 9, 1873 (2002).
URL
http://www.ornl.gov/fed/scidacrf/ |
