Study of the fast electron distribution function in lower hybrid and electron cyclotron current driven plasmas in the wt-3 tokamak

K. Ogura, H. Tanaka, S. Ide, M. Iida, Kazuaki Hanada, M. Yoshida, T. Minami, T. Cho, M. Nakamura, T. Maekawa, Y. Terumichi, S. Tanaka

研究成果: ジャーナルへの寄稿記事

16 引用 (Scopus)

抄録

The distribution function f(p) of fast electrons produced by lower hybrid current drive (LHCD) is investigated in the WT-3 tokamak, using a combination of measurements of the hard X-ray (HXR) angular distribution with respect to the toroidal magnetic field and observations of the HXR radial profile. The data obtained indicate the formation of a plateau-like region in f(p) which corresponds to a region of resonant interaction between the lower hybrid (LH) wave and the electrons. The energy of the fast electrons in the peripheral plasma region is observed to be higher than that in the central plasma region under operational conditions with a high plasma current (Ip ≤ 80 kA). At low current (Ip ≤ 50 kA), however, the energy of fast electrons is constant along the plasma radius. In the current ramp-up phase, fast electrons are generated in the directions normal to and opposite to the LH wave propagation. The latter case is ascribed to a negatively biased toroidal electric field induced by the current ramp-up. To study the characteristic change of f(p) for various current drive mechanisms, HXR measurements are performed in electron cyclotron current driven (ECCD) plasma and in Ohmic heating (OH) plasma. In ECCD plasma, the perpendicular energy of fast electrons increases, which indicates that fast electrons are accelerated perpendicularly by electron cyclotron heating. In both LHCD and ECCD plasmas, fast electrons flow in the direction opposite to the wave propagation, while no such fast electrons are formed in OH plasma.

元の言語英語
ページ(範囲)1015-1033
ページ数19
ジャーナルNuclear Fusion
31
発行部数6
DOI
出版物ステータス出版済み - 1 1 1991
外部発表Yes

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electron distribution
cyclotrons
distribution functions
electrons
plasma heating
ramps
wave propagation
electron cyclotron heating
x rays
plasma currents
low currents
energy
plateaus
angular distribution

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

これを引用

Study of the fast electron distribution function in lower hybrid and electron cyclotron current driven plasmas in the wt-3 tokamak. / Ogura, K.; Tanaka, H.; Ide, S.; Iida, M.; Hanada, Kazuaki; Yoshida, M.; Minami, T.; Cho, T.; Nakamura, M.; Maekawa, T.; Terumichi, Y.; Tanaka, S.

:: Nuclear Fusion, 巻 31, 番号 6, 01.01.1991, p. 1015-1033.

研究成果: ジャーナルへの寄稿記事

Ogura, K, Tanaka, H, Ide, S, Iida, M, Hanada, K, Yoshida, M, Minami, T, Cho, T, Nakamura, M, Maekawa, T, Terumichi, Y & Tanaka, S 1991, 'Study of the fast electron distribution function in lower hybrid and electron cyclotron current driven plasmas in the wt-3 tokamak', Nuclear Fusion, 巻. 31, 番号 6, pp. 1015-1033. https://doi.org/10.1088/0029-5515/31/6/002
Ogura, K. ; Tanaka, H. ; Ide, S. ; Iida, M. ; Hanada, Kazuaki ; Yoshida, M. ; Minami, T. ; Cho, T. ; Nakamura, M. ; Maekawa, T. ; Terumichi, Y. ; Tanaka, S. / Study of the fast electron distribution function in lower hybrid and electron cyclotron current driven plasmas in the wt-3 tokamak. :: Nuclear Fusion. 1991 ; 巻 31, 番号 6. pp. 1015-1033.
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abstract = "The distribution function f(p) of fast electrons produced by lower hybrid current drive (LHCD) is investigated in the WT-3 tokamak, using a combination of measurements of the hard X-ray (HXR) angular distribution with respect to the toroidal magnetic field and observations of the HXR radial profile. The data obtained indicate the formation of a plateau-like region in f(p) which corresponds to a region of resonant interaction between the lower hybrid (LH) wave and the electrons. The energy of the fast electrons in the peripheral plasma region is observed to be higher than that in the central plasma region under operational conditions with a high plasma current (Ip ≤ 80 kA). At low current (Ip ≤ 50 kA), however, the energy of fast electrons is constant along the plasma radius. In the current ramp-up phase, fast electrons are generated in the directions normal to and opposite to the LH wave propagation. The latter case is ascribed to a negatively biased toroidal electric field induced by the current ramp-up. To study the characteristic change of f(p) for various current drive mechanisms, HXR measurements are performed in electron cyclotron current driven (ECCD) plasma and in Ohmic heating (OH) plasma. In ECCD plasma, the perpendicular energy of fast electrons increases, which indicates that fast electrons are accelerated perpendicularly by electron cyclotron heating. In both LHCD and ECCD plasmas, fast electrons flow in the direction opposite to the wave propagation, while no such fast electrons are formed in OH plasma.",
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T1 - Study of the fast electron distribution function in lower hybrid and electron cyclotron current driven plasmas in the wt-3 tokamak

AU - Ogura, K.

AU - Tanaka, H.

AU - Ide, S.

AU - Iida, M.

AU - Hanada, Kazuaki

AU - Yoshida, M.

AU - Minami, T.

AU - Cho, T.

AU - Nakamura, M.

AU - Maekawa, T.

AU - Terumichi, Y.

AU - Tanaka, S.

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