Plasma Current Sustainment and Ramp-Up by Electron Cyclotron Waves in the WT-2 Tokamak

Akira Ando; Kazuo Ogura; Hitoshi Tanaka; Motomi Iida; Shunsuke Ide; Kensuke Oho; Shigenori Ozaki; Takashi Maekawa; Yasushi Terumichi; Shigetoshi Tanaka; Masahiko Nakamura; Teruji Cho

doi:10.1143/JPSJ.55.4259

Plasma Current Sustainment and Ramp-Up by Electron Cyclotron Waves in the WT-2 Tokamak

Akira Ando, Kazuo Ogura, Hitoshi Tanaka, Motomi Iida, Shunsuke Ide, Kensuke Oho, Shigenori Ozaki, Takashi Maekawa, Yasushi Terumichi, Shigetoshi Tanaka, Masahiko Nakamura, Teruji Cho

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

7 Citations (Scopus)

Abstract

By injecting RF power in the electron cyclotron(EC) range of frequency, the plasma current is sustained and ramped up after OH power is shut off. Here EC driven current is generated by EC heating of suprathermal electrons in the OH plasma. The plasma current is also generated in the RF discharge plasma at EC resonance (ECR plasma) in WT-2. Both in OH-produced and ECR-produced plasmas, the electron velocity distribution function is asymmetric with respect to the magnetic field. This asymmetry leads to an asymmetric EC heating generating the toroidal plasma current. The efficiency of EC current drive is obtained as η ~ 1 × 10⁻⁴ (10²⁰ m⁻²kA/kW), which is small in comparison with the theoretical prediction.

Original language	English
Pages (from-to)	4259-4271
Number of pages	13
Journal	journal of the physical society of japan
Volume	55
Issue number	12
DOIs	https://doi.org/10.1143/JPSJ.55.4259
Publication status	Published - 1986 Dec
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.55.4259

Cite this

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title = "Plasma Current Sustainment and Ramp-Up by Electron Cyclotron Waves in the WT-2 Tokamak",

abstract = "By injecting RF power in the electron cyclotron(EC) range of frequency, the plasma current is sustained and ramped up after OH power is shut off. Here EC driven current is generated by EC heating of suprathermal electrons in the OH plasma. The plasma current is also generated in the RF discharge plasma at EC resonance (ECR plasma) in WT-2. Both in OH-produced and ECR-produced plasmas, the electron velocity distribution function is asymmetric with respect to the magnetic field. This asymmetry leads to an asymmetric EC heating generating the toroidal plasma current. The efficiency of EC current drive is obtained as η ~ 1 × 10−4 (1020 m−2kA/kW), which is small in comparison with the theoretical prediction.",

author = "Akira Ando and Kazuo Ogura and Hitoshi Tanaka and Motomi Iida and Shunsuke Ide and Kensuke Oho and Shigenori Ozaki and Takashi Maekawa and Yasushi Terumichi and Shigetoshi Tanaka and Masahiko Nakamura and Teruji Cho",

year = "1986",

month = dec,

doi = "10.1143/JPSJ.55.4259",

language = "English",

volume = "55",

pages = "4259--4271",

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publisher = "Physical Society of Japan",

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TY - JOUR

T1 - Plasma Current Sustainment and Ramp-Up by Electron Cyclotron Waves in the WT-2 Tokamak

AU - Ando, Akira

AU - Ogura, Kazuo

AU - Tanaka, Hitoshi

AU - Iida, Motomi

AU - Ide, Shunsuke

AU - Oho, Kensuke

AU - Ozaki, Shigenori

AU - Maekawa, Takashi

AU - Terumichi, Yasushi

AU - Tanaka, Shigetoshi

AU - Nakamura, Masahiko

AU - Cho, Teruji

PY - 1986/12

Y1 - 1986/12

N2 - By injecting RF power in the electron cyclotron(EC) range of frequency, the plasma current is sustained and ramped up after OH power is shut off. Here EC driven current is generated by EC heating of suprathermal electrons in the OH plasma. The plasma current is also generated in the RF discharge plasma at EC resonance (ECR plasma) in WT-2. Both in OH-produced and ECR-produced plasmas, the electron velocity distribution function is asymmetric with respect to the magnetic field. This asymmetry leads to an asymmetric EC heating generating the toroidal plasma current. The efficiency of EC current drive is obtained as η ~ 1 × 10−4 (1020 m−2kA/kW), which is small in comparison with the theoretical prediction.

AB - By injecting RF power in the electron cyclotron(EC) range of frequency, the plasma current is sustained and ramped up after OH power is shut off. Here EC driven current is generated by EC heating of suprathermal electrons in the OH plasma. The plasma current is also generated in the RF discharge plasma at EC resonance (ECR plasma) in WT-2. Both in OH-produced and ECR-produced plasmas, the electron velocity distribution function is asymmetric with respect to the magnetic field. This asymmetry leads to an asymmetric EC heating generating the toroidal plasma current. The efficiency of EC current drive is obtained as η ~ 1 × 10−4 (1020 m−2kA/kW), which is small in comparison with the theoretical prediction.

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Plasma Current Sustainment and Ramp-Up by Electron Cyclotron Waves in the WT-2 Tokamak

Abstract

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