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, akihide fujisawa, K. Ida, K. Itoh, P. Merkel, M. Drevlak, R. Zille, S. Gori, J. Nührenberg

Research output: Contribution to journalArticle

27 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1865-1871
Number of pages7
JournalNuclear Fusion
Volume41
Issue number12
DOIs
Publication statusPublished - Dec 1 2001

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low aspect ratio
stellarators
engineering
physics
coils
electron diffusion
magnetic field configurations
alpha particles
flexibility
diffusion coefficient
viscosity
optimization
evaluation
symmetry
configurations

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Okamura, S., Matsuoka, K., Nishimura, S., Isobe, M., Nomura, I., Suzuki, C., ... 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

Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa. / Okamura, S.; Matsuoka, K.; Nishimura, S.; Isobe, M.; Nomura, I.; Suzuki, C.; Shimizu, A.; Murakami, S.; Nakajima, N.; Yokoyama, M.; fujisawa, akihide; Ida, K.; Itoh, K.; Merkel, P.; Drevlak, M.; Zille, R.; Gori, S.; Nührenberg, J.

In: Nuclear Fusion, Vol. 41, No. 12, 01.12.2001, p. 1865-1871.

Research output: Contribution to journalArticle

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
Okamura S, Matsuoka K, Nishimura S, Isobe M, Nomura I, Suzuki C et al. Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa. Nuclear Fusion. 2001 Dec 1;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, akihide ; Ida, K. ; Itoh, K. ; Merkel, P. ; Drevlak, M. ; Zille, R. ; Gori, S. ; Nührenberg, J. / Physics and engineering design of the low aspect ratio quasi-axisymmetric stellarator CHS-qa. In: Nuclear Fusion. 2001 ; Vol. 41, No. 12. pp. 1865-1871.
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