Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa

S. Okamura; K. Matsuoka; S. Nishimura; M. Isobe; I. Nomura; C. Suzuki; A. Shimizu; S. Murakami; N. Nakajima; M. Yokoyama; A. Fujisawa; K. Ida; K. Itoh; P. Merkel; M. Drevlak; R. Zille; S. Gori; J. Nührenberg

doi:10.1088/0029-5515/41/12/314

Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa

S. Okamura, K. Matsuoka, S. Nishimura, M. Isobe, I. Nomura, C. Suzuki, A. Shimizu, S. Murakami, N. Nakajima, M. Yokoyama, A. Fujisawa, K. Ida, K. Itoh, P. Merkel, M. Drevlak, R. Zille, S. Gori, J. Nührenberg

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Abstract

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

Original language	English
Pages (from-to)	1865-1871
Number of pages	7
Journal	Nuclear Fusion
Volume	41
Issue number	12
DOIs	https://doi.org/10.1088/0029-5515/41/12/314
Publication status	Published - Dec 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Okamura, S., Matsuoka, K., Nishimura, S., Isobe, M., Nomura, I., Suzuki, C., Shimizu, A., Murakami, S., Nakajima, N., Yokoyama, M., Fujisawa, A., Ida, K., Itoh, K., Merkel, P., Drevlak, M., Zille, R., Gori, S., & Nührenberg, J. (2001). Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa. Nuclear Fusion, 41(12), 1865-1871. https://doi.org/10.1088/0029-5515/41/12/314

Okamura, S, Matsuoka, K, Nishimura, S, Isobe, M, Nomura, I, Suzuki, C, Shimizu, A, Murakami, S, Nakajima, N, Yokoyama, M, Fujisawa, A, Ida, K, Itoh, K, Merkel, P, Drevlak, M, Zille, R, Gori, S & Nührenberg, J 2001, 'Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa', Nuclear Fusion, vol. 41, no. 12, pp. 1865-1871. https://doi.org/10.1088/0029-5515/41/12/314

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title = "Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa",

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

author = "S. Okamura and K. Matsuoka and S. Nishimura and M. Isobe and I. Nomura and C. Suzuki and A. Shimizu and S. Murakami and N. Nakajima and M. Yokoyama and A. Fujisawa and K. Ida and K. Itoh and P. Merkel and M. Drevlak and R. Zille and S. Gori and J. N{\"u}hrenberg",

year = "2001",

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doi = "10.1088/0029-5515/41/12/314",

language = "English",

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AU - Okamura, S.

AU - Matsuoka, K.

AU - Nishimura, S.

AU - Isobe, M.

AU - Nomura, I.

AU - Suzuki, C.

AU - Shimizu, A.

AU - Murakami, S.

AU - Nakajima, N.

AU - Yokoyama, M.

AU - Fujisawa, A.

AU - Ida, K.

AU - Itoh, K.

AU - Merkel, P.

AU - Drevlak, M.

AU - Zille, R.

AU - Gori, S.

AU - Nührenberg, J.

PY - 2001/12

Y1 - 2001/12

N2 - A low aspect ratio quasi-axisymmetric stellarator, CHS-qa, has been designed. An optimization code has been used to design a magnetic field configuration with evaluations of the following physical quantities: quasi-axisymmetry, rotational transform, MHD stability and alpha particle collisionless confinement. It is shown that the electron neoclassical diffusion coefficient is similar to that of tokamaks for the low collisional regime. A self-consistent equilibrium with bootstrap current confirms the global mode stability up to 130 kA for an R = 1.5 m and Bt = 1.5 T device. The neoclassical plasma rotation viscosity is greatly suppressed compared with that of conventional stellarators. The engineering design was completed with 20 main modular coils and auxiliary coils, which provide flexibility of configuration in experiments for confinement improvement and MHD stability.

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

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JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 12

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Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa

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