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 journalArticlepeer-review

7 Citations (Scopus)


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 languageEnglish
Pages (from-to)4259-4271
Number of pages13
Journaljournal of the physical society of japan
Issue number12
Publication statusPublished - 1986 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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