Extension of the high-ion-temperature regime in the Large Helical Device | Zendy

M. Yokoyama | Zendy; K. Nagaoka | Zendy; M. Yoshinuma | Zendy; Y. Takeiri | Zendy; K. Ida | Zendy; S. Morita | Zendy; O. Kaneko | Zendy; T. Seki | Zendy; H. Kasahara | Zendy; T. Mutoh | Zendy; Y. Oka | Zendy; K. Tsumori | Zendy; M. Osakabe | Zendy; K. Ikeda | Zendy; K. Tanaka | Zendy; H. Funaba | Zendy; S. Matsuoka | Zendy; S. Masuzaki | Zendy; J. Miyazawa | Zendy; R. Sakamoto | Zendy; H. Yamada | Zendy; K. Kawahata | Zendy; N. Ohyabu | Zendy; S. Imagawa | Zendy; A. Komori | Zendy; S. Sudo | Zendy; O. Motojima | Zendy

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Extension of the high-ion-temperature regime in the Large Helical Device

Author(s) -

M. Yokoyama,

K. Nagaoka,

M. Yoshinuma,

Y. Takeiri,

K. Ida,

S. Morita,

O. Kaneko,

T. Seki,

H. Kasahara,

T. Mutoh,

Y. Oka,

K. Tsumori,

M. Osakabe,

K. Ikeda,

K. Tanaka,

H. Funaba,

S. Matsuoka,

S. Masuzaki,

J. Miyazawa,

R. Sakamoto,

H. Yamada,

K. Kawahata,

N. Ohyabu,

S. Imagawa,

A. Komori,

S. Sudo,

O. Motojima

Publication year - 2008

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.2890755

Subject(s) - ambipolar diffusion , physics , ion , plasma , thermal diffusivity , atomic physics , large helical device , tokamak , diffusion , particle (ecology) , electric field , fusion , thermodynamics , nuclear physics , linguistics , oceanography , philosophy , quantum mechanics , geology

High-ion-temperature (exceeding 5 keV) hydrogen plasmas have been successfully produced in the Large Helical Device [Iiyoshi et al., Nucl. Fusion 39, 1245 (1999); Motojima et al., Nucl. Fusion 47, S668 (2007)] with the ion heat confinement improvement in the core region. The experimental ion heat diffusivity at the core region is found to be almost independent of the ion temperature, T_i (even decreasing as T_i increases). The neoclassical (NC) ripple transport is suppressed by the ambipolar radial electric field, E_r (<0) predicted by NC transport fluxes. The temperature ratio, Ti/T_e, is one of the key parameters to reduce the NC ambipolar particle and heat fluxes. Thus, it is suggested that the selective ion heating (making Ti/T_e larger) is a plausible approach to further increase Ti. Spontaneous rotation is evaluated in these high-T_i plasmas, in which a co-directed component is recognized at the radial location with a large T_i gradient, in addition to the tokamak-like counter-directed component expected for E_r<0

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