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Electrical design and test of ICRF antenna for JT-60U

M. Saigusa, T. Fujii, H. Kimura, S. Moriyama, N. Kobayashi1994年Fusion Engineering and DesignIF 1.7出版社

AbstractAn antenna array is designed for ion cyclotron resonance heating (ICRH) for JT-60U. The coupling properties of the antenna are calculated by using the variational method for obtaining a consistent current profile on the current strap. The antenna consists of a 2 × 2 poloidal and toroidal phased loop array with two solid septa between each two antennas. The spectrum of the radiated parallel refractive index is optimized for out-of-phasing in order to obtain a high heating efficiency and a high loading resistance, and to suppress the impurity production. The predicted loading resistance is sufficient for ICRH experiments as long as the distance between the Faraday shield and plasma surface is smaller than 6 cm in the H-mode and 8 cm in the L-mode. The scattering parameters of the JT-60U antenna are measured in a low power test. The maximum with-standing RF voltage in the test stand is 38 kV which is limited by generator power and circuit losses.

日本語訳

アンテナアレイは、イオンサイクロトロン共鳴加熱(ICRH)用に設計され、JT-60Uにおける結合特性は、電流ストラップ上の整合した電流分布を得るための変分法を用いて計算される。アンテナは、各2本のアンテナ間に2つの固体セプタを有する2×2ポロイダル・トロイダル位相ループアレイで構成される。放射される平行屈折率のスペクトルは、高い加熱効率と高い負荷抵抗を得るため、また不純物生成を抑制するために、位相調整(out-of-phasing)に対して最適化される。予測される負荷抵抗は、ファラデーシールドとプラズマ表面との距離がHモードで6cm未満、Lモードで8cm未満である限り、ICRH実験に十分である。JT-60Uの散乱パラメータは低電力試験で測定される。試験スタンドにおける最大RF耐電圧は38kVであり、これは発電機出力と回路損失によって制限される。

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Ion cyclotron heatingJT-60UIon cyclotron antenna
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