Session KP01 - Poster Session III.
POSTER session, Tuesday afternoon, March 23
Exhibit Hall, GWCC
The problem of ``reverse engineering'' suitable coils for the promising low-aspect-ratio quasi-symmetric configurations is important and challenging. A fast green's function method is often used (NESCOIL(P. Merkel, Nucl. Fusion 27, 867 (1987))) in the initial design of such coils. We present a modification of this method where we use singular value decomposition (SVD) techniques to obtain good coils even when the standard NESCOIL code fails to yield an answer. This
modification allows us to reduce the ``complexity'' of coils without significantly increasing the ``error'', i.e., the difference between the
initial plasma configuration and the plasma shape produced by these coils. This method has been successfully applied to both the quasi-axisymmetric
and the quasi-omigeneous configuration being studied for the National Stellarator Program.