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During the production process figures 1(a) and 6(c) were mistakenly swapped. The correct figures are displayed below.
Figure 1. Coils for the rotating ellipse configuration. (a) The initial 16 circular coils with equal toroidal intervals. (b) The optimized coils with only physical constraints. Red surfaces represent the target plasma boundary.
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Standard image High-resolution imageFigure 6. Different coil shapes from FOCUS optimizations. (a) Solution of only planar coils (NF = 1). (b) With only four coils (NC = 4). (c) Attractive coils balancing both physical accuracy and engineering simplicity.
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