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(ICP/16) Physics and Engineering Design of a Low Aspect Ratio Quasi-Axisymmetric Stellarator CHS-qa

S. Okamura¹⁾, K. Matsuoka¹⁾, S. Nishimura¹⁾, M. Isobe¹⁾, I. Nomura¹⁾, C. Suzuki¹⁾, A. Shimizu¹⁾, S. Murakami¹⁾, N. Nakajima¹⁾, M. Yokoyama¹⁾, A. Fujisawa¹⁾, K. Ida¹⁾, K. Itoh¹⁾, P. Merkel²⁾, , M. Drevlak²⁾, R. Zille²⁾, S. Gori²⁾, J. Nührenberg^2)
 
1) National Institute for Fusion Science, Toki, 509-5292, Japan
²⁾ Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald, D-17489, Germany

Abstract.  A low-aspect-ratio quasi-axisymmetric stellarator CHS-qa was designed. An optimization code was used to design a magnetic field configuration with evaluations of physical quantities of quasi-axisymmetry, rotational transform, MHD stability and alpha particle collisionless confinement. It is shown that the electron neoclassical diffusion coefficient is similar to tokamaks for the low collisional regime. A self-consistent equilibrium with bootstrap current confirms the global mode stability up to 130 kA for R = 1.5 m and Bt = 1.5 T device. The evaluation of plasma rotation viscosity is greatly suppressed compared with conventional stellarators. Engineering design was completed with 20 main modular coils and auxiliary coils which provide flexibility of configuration study for confinement improvement and MHD stability.

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