A New Optimized Quasihelically SymmetricStellarator

Abstract

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.

13 figures, 3 tables

References in corpus (7)

• Comparison of particle trajectories and collision operators for collisional transport in nonaxisymmetric plasmas
• An improved current potential method for fast computation of stellarator coil shapes
• Properties of a new quasi-axisymmetric configuration
• Direct construction of optimized stellarator shapes. I. Theory in cylindrical coordinates
• Direct construction of optimized stellarator shapes. II. Numerical quasisymmetric solutions
• Direct construction of optimized stellarator shapes. III. Omnigenity near the magnetic axis
• Distinct turbulence saturation regimes in stellarators

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