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A New Optimized Quasihelically SymmetricStellarator

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arxiv 2004.11426 v1 pith:LRE64GNY submitted 2020-04-23 physics.plasm-ph

A New Optimized Quasihelically SymmetricStellarator

classification physics.plasm-ph
keywords confinementenergeticparticleconfigurationoptimizedcoilsdivertornear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A new optimized quasihelically symmetric configuration is described that has the desir-able properties of improved energetic particle confinement, reduced turbulent transportby 3D shaping, and non-resonant divertor capabilities. The configuration presented in thispaper is explicitly optimized for quasihelical symmetry, energetic particle confinement,neoclassical confinement, and stability near the axis. Post optimization, the configurationwas evaluated for its performance with regard to energetic particle transport, idealmagnetohydrodynamic (MHD) stability at various values of plasma pressure, and iontemperature gradient instability induced turbulent transport. The effect of discrete coilson various confinement figures of merit, including energetic particle confinement, aredetermined by generating single-filament coils for the configuration. Preliminary divertoranalysis shows that coils can be created that do not interfere with expansion of thevessel volume near the regions of outgoing heat flux, thus demonstrating the possibilityof operating a non-resonant divertor.

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