Role of Boundary Plasma in Lower-Hybrid-Frequency Heating of a Tokamak

Kazuya Uehara; Takumi Yamamoto; Tsuneyuki Fujii; Norio Suzuki; Tsuyoshi Imai; Satoru Iizuka; Hiroshi Takeuchi; Satoshi Kasai; Hidetoshi Yoshida; Noboru Fujisawa; Takashi Nagashima

doi:10.1143/JPSJ.51.1958

Role of Boundary Plasma in Lower-Hybrid-Frequency Heating of a Tokamak

Kazuya Uehara, Takumi Yamamoto, Tsuneyuki Fujii, Norio Suzuki, Tsuyoshi Imai, Satoru Iizuka, Hiroshi Takeuchi, Satoshi Kasai, Hidetoshi Yoshida, Noboru Fujisawa, Takashi Nagashima

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Boundary plasma of a circular tokamak has been investigated by means of electrostatic probes during lower-hybrid heating. The reflection coefficient is affected by the density gradient in front of the launcher. An effective ion heating is performed in the main plasma region when the boundary electron temperature is relatively high enough to suppress the parametric decay instabilities.The simultaneous injection of neutral beams as well as the lower-hybrid wave brings the suppressionof instabilities with increase of the electron temperature coming from the neutral beam heating.

Original language	English
Pages (from-to)	1958-1964
Number of pages	7
Journal	journal of the physical society of japan
Volume	51
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.51.1958
Publication status	Published - 1982
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.51.1958

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title = "Role of Boundary Plasma in Lower-Hybrid-Frequency Heating of a Tokamak",

abstract = "Boundary plasma of a circular tokamak has been investigated by means of electrostatic probes during lower-hybrid heating. The reflection coefficient is affected by the density gradient in front of the launcher. An effective ion heating is performed in the main plasma region when the boundary electron temperature is relatively high enough to suppress the parametric decay instabilities.The simultaneous injection of neutral beams as well as the lower-hybrid wave brings the suppressionof instabilities with increase of the electron temperature coming from the neutral beam heating.",

author = "Kazuya Uehara and Takumi Yamamoto and Tsuneyuki Fujii and Norio Suzuki and Tsuyoshi Imai and Satoru Iizuka and Hiroshi Takeuchi and Satoshi Kasai and Hidetoshi Yoshida and Noboru Fujisawa and Takashi Nagashima",

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doi = "10.1143/JPSJ.51.1958",

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TY - JOUR

T1 - Role of Boundary Plasma in Lower-Hybrid-Frequency Heating of a Tokamak

AU - Uehara, Kazuya

AU - Yamamoto, Takumi

AU - Fujii, Tsuneyuki

AU - Suzuki, Norio

AU - Imai, Tsuyoshi

AU - Iizuka, Satoru

AU - Takeuchi, Hiroshi

AU - Kasai, Satoshi

AU - Yoshida, Hidetoshi

AU - Fujisawa, Noboru

AU - Nagashima, Takashi

PY - 1982

Y1 - 1982

N2 - Boundary plasma of a circular tokamak has been investigated by means of electrostatic probes during lower-hybrid heating. The reflection coefficient is affected by the density gradient in front of the launcher. An effective ion heating is performed in the main plasma region when the boundary electron temperature is relatively high enough to suppress the parametric decay instabilities.The simultaneous injection of neutral beams as well as the lower-hybrid wave brings the suppressionof instabilities with increase of the electron temperature coming from the neutral beam heating.

AB - Boundary plasma of a circular tokamak has been investigated by means of electrostatic probes during lower-hybrid heating. The reflection coefficient is affected by the density gradient in front of the launcher. An effective ion heating is performed in the main plasma region when the boundary electron temperature is relatively high enough to suppress the parametric decay instabilities.The simultaneous injection of neutral beams as well as the lower-hybrid wave brings the suppressionof instabilities with increase of the electron temperature coming from the neutral beam heating.

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DO - 10.1143/JPSJ.51.1958

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JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

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ER -

Role of Boundary Plasma in Lower-Hybrid-Frequency Heating of a Tokamak

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