Sherwood 2015

Abstract Details

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Coupling an ICRF core spectral solver to and edge FEM code

Author: John C. Wright
Requested Type: Poster Only
Submitted: 2015-01-20 13:13:48

Co-authors: Syunichi Shiraiwa

Contact Info:
NW16-262// 77 Mass. Avenue
Cambridge, MA   02139

Abstract Text:
The finite element method (FEM) and the spectral approaches
to simulation of ion cyclotron (IC) waves in toroidal plasmas each
have strengths and weaknesses. For example, the spectral approach (eg
TORIC) has a natural algebraic representation of the parallel
wavenumber and hence the wave dispersion but does not easily represent
complex geometries outside the last closed flux surface, whereas the
FEM approach (eg LHEAF) naturally represents arbitrary geometries but
does not easily represent thermal corrections to the plasma
dispersion. The two domains: thermal core in flux surface and cold
edge plasma may be combined in such as way that each approach is used
where it works naturally. Among the possible ways of doing this, we
demonstrate the method of mode matching. This method provides an easy
way of combining the two linear systems without significant
modifications to the separate codes. We will present proof of
principal cases and initial applications to minority heating.


March 16-18, 2015
The Courant Institute, New York University