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- plasma transport and confinement (collisional transport, energetic particle transport)
- plasma stability (Mercier, ballooning, kink, neoclassical tearing, vertical displacements)
- keep the plasma current and its profile close to the in-situ current (bootstrap current) that the plasma generates naturally
- acheive a compact (low aspect ratio) design
- consider only plasma shapes that can be generated by feasible coil geometries
- avoid narrow thickness regions in the plasma where neutrals can penetrate and transport energy out through charge exchange reactions
- avoid other pathological plasma shapes (cusp regions, strong elongations, etc.)
- Keep the minimum separation between adjacent coils above a certain level
- Keep the minimum separation between coils and plasma above a certain level (necessary for extrapolation to a compact reactor)
- Avoid small radii of curvature in the coil geometry
- Minimize the total length of individual coils
- Minimize extension of the coils into the open space in the center of the torus (i.e., to allow access for Ohmic heating, planar toroidal, and vertical field coils)