(FT/P2-06) Integrated Plasma and Coil Optimization for Compact Stellarators

**Abstract.** The stellarator optimization code STELLOPT is used in design
studies for the National Compact Stellarator Experiment (NCSX) and the
Quasi-poloidal Stellarator Experiment (QPS) to determine the shape of the
outer magnetic flux surface, together with the plasma pressure and current
profiles, that lead to attractive stability and confinement properties at
high beta. A coil optimization code COILOPT then determines the coil
geometry and currents that best reconstruct the physics solution. This
procedure does not always converge to a design that simultaneously satisfies
both the targeted plasma properties (e.g., quasi-symmetry, neoclassical
confinement, attainable beta, etc.) and coil engineering criteria (minimum
coil curvature, maximum current density, plasma access, etc.). An innovation
in compact stellarator design is the integration of the STELLOPT and COILOPT
codes to provide a merged plasma-coil optimization tool. This tool ensures
that stellarator physics and engineering criteria are simultaneously
satisfied. This self-consistent analysis is successful largely because it is
implemented only after the separate calculations have identified good
candidates for a design point.

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*IAEA 2003*