Toroidal Plasma Current Startup and Sustainment by RF in the WT-3 Tokamak

The toroidal plasma current is started up by rf power alone and is ramped up to above 20 kA in a low density plasma. The fraction εR of injected LHW power is converted into poloidal magnetic field energy and its maximum value is about 5 %. For high density cases, a quasi-steady state discharge is ob...

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Bibliographic Details
Published inKakuyūgō kenkyū Vol. 61; no. 2; pp. 106 - 127
Main Authors Ogura, Kazuo, Tanaka, Hitoshi, Ide, Shunsuke, Iida, Motomi, Hanada, Kazuaki, Itou, Takehiko, Iwamasa, Mikito, Maekawa, Takasi, Terumichi, Yasushi, Tanaka, Shigetoshi
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Plasma Science and Nuclear Fusion Research 1989
Subjects
confinement
current drive
current startup
electron cyclotron resonance
lower hybrid wave
plasma
tokamak
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Summary:The toroidal plasma current is started up by rf power alone and is ramped up to above 20 kA in a low density plasma. The fraction εR of injected LHW power is converted into poloidal magnetic field energy and its maximum value is about 5 %. For high density cases, a quasi-steady state discharge is obtained and the figure of merit ηCD for steady current drive by LHW is about 0.04 × 1019 (A·m-2/W). The direct loss of fast electrons from the plasma is very large and results in the low εR and ηCD in our experiments.
ISSN:0451-2375
1884-9571
DOI:10.1585/jspf1958.61.106