Development of steady-state operation using ion cyclotron heating in the Large Helical Device | Zendy

Hiroshi Kasahara | Zendy; T. Seki | Zendy; Kenji Saito | Zendy; R. Seki | Zendy; R. Kumazawa | Zendy; Y. Yoshimura | Zendy; S. Kubo | Zendy; Τ. Shimozuma | Zendy; H. Igami | Zendy; H. Takahashi | Zendy; K. Nagasaki | Zendy; Y. Ueda | Zendy; M. Tokitani | Zendy; N. Ashikawa | Zendy; M. Shoji | Zendy; T. Wakatsuki | Zendy; S. Kamio | Zendy; H. Tsuchiya | Zendy; S. Yoshimura | Zendy; N. Tamura | Zendy; C. Suzuki | Zendy; H. Yamada | Zendy; T. Mutoh | Zendy

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Development of steady-state operation using ion cyclotron heating in the Large Helical Device

Author(s) -

Hiroshi Kasahara,

T. Seki,

Kenji Saito,

R. Seki,

R. Kumazawa,

Y. Yoshimura,

S. Kubo,

Τ. Shimozuma,

H. Igami,

H. Takahashi,

K. Nagasaki,

Y. Ueda,

M. Tokitani,

N. Ashikawa,

M. Shoji,

T. Wakatsuki,

S. Kamio,

H. Tsuchiya,

S. Yoshimura,

N. Tamura,

C. Suzuki,

H. Yamada,

T. Mutoh

Publication year - 2014

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 - 10.1063/1.4884363

Subject(s) - physics , cyclotron , atomic physics , large helical device , plasma , antenna (radio) , dipole , electron , pulse duration , electron temperature , dipole antenna , toroid , nuclear magnetic resonance , optics , nuclear physics , electrical engineering , laser , quantum mechanics , engineering

Using a handshake shape (HAS) antenna phasing dipole for ion cyclotron heating (ICH), the heating efficiency was higher than that using a previous poloidal array antenna in the Large Helical Device. In order to sustain the dipole operation, real-time feedback for impedance matching and maintaining the same phase and power was adopted during long-pulse discharge. The HAS antenna was designed to reduce parasitic losses associated with energetic particle and radio-frequency (RF) sheath effects by field-aligned current concentration on the midplane. Local hot spots and the inhomogeneity of the diverter heat profile in the toroidal direction were reduced. The long-pulse discharge with an electron density (n e0) of 1?×?1019 m?3, center electron temperature (T e0) of 2.5?keV, a plasma duration time (t d) of 19?min, and RF heating power (P RF ) of 1?MW was achieved by ICH and electron cyclotron heating

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