Electron cyclotron current drive at the second harmonic in the WT-3 tokamak

H. Tanaka, A. Ando, K. Ogura, S. Ide, M. Iida, K. Oho, S. Ozaki, K. Iwamura, A. Yamazaki, M. Nakamura, T. Maekawa, Y. Terumichi, S. Tanaka

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27 Citations (Scopus)

Abstract

Electron cyclotron current drive (ECCD) at the second harmonic (=2e) is demonstrated for two types of plasma in the WT-3 tokamak. When microwave power PEC is injected into a plasma after Ohmic heating (OH) power is shut down, the plasma current is sustained and ramped up by the EC wave only. Here 2e EC-driven current is generated by 2e EC heating of an energetic electron tail existing in the OH plasma. Further, when PEC is injected into a microwave discharge plasma, 2e EC-driven plasma current is started up and 23 ECCD plasma is formed without OH power. The 2e ECCD efficiency is the same order as that at =e, but the 3e EC-driven current is not generated, in contrast with the theoretical prediction.

Original languageEnglish
Pages (from-to)1033-1036
Number of pages4
JournalPhysical Review Letters
Volume60
Issue number11
DOIs
Publication statusPublished - 1988 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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