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Designing Coils for Compact Stellarators

Dennis J. Strickler, Lee A. Berry, Steven P. Hirshman

Fusion Science and Technology

Volume 41 / Number 2 / March 2002 / Pages 107-115


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A method is presented for designing coils for compact stellarators. In contrast to methods that select a finite number of coils from an optimal continuous surface current distribution, the COILOPT code solves for the optimal parameters in an explicit representation of modular coils on a toroidal winding surface that is well separated from the plasma boundary, together with the coefficients of the winding surface. The problem is posed as a balance between approximating a prescribed magnetic configuration and satisfying certain critical engineering requirements. Results are presented for quasi-axisymmetric and quasi-poloidal compact stellarator designs.

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