Physical and Engineering Constraints for Tokamak Reactors with Helical Coils

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Abstract
We present an analytical and numerical analysis of a tokamak reactor with a set of helical coils added in order to eliminate plasma disruptions. The optimal helical configuration was found to be a set of continuous, ℓ = 2 stellarator coils which are made of copper and are internal to the toroidal field coils, ℓ being the number of poloidal field periods. (The optimization process did not include evaluation of the viability of a modular stellarator reactor). Scaling laws were developed for this optimal configuration, and a series of parametric scans are performed with varying assumptions for the forces on the helical coils and the ratio of helical coil transform to plasma transform (M*). The option space available for attractive reactor designs is strongly constrained and involves large forces on the helical coils, low q plasma operation (q being the plasma safety factor), and moderately low M* (3 to 5). Numerical calculations showed that M* must be > 3 in order to obtain well defined flux surfaces...

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