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JT-60SAでのNTM抑制実験に向けたミリ波高速スイッチシステムの検討

Millimeter fast directional switch system for the NTM suppression experiments on JT-60SA

出射 浩*; 森山 伸一; 小林 貴之; 諫山 明彦; 坂口 政嗣*; Kasparek, W.*

Idei, Hiroshi*; Moriyama, Shinichi; Kobayashi, Takayuki; Isayama, Akihiko; Sakaguchi, Masatsugu*; Kasparek, W.*

急峻な分波器特性によって、わずかな周波数制御で経路変更できる2周波数動作式の高速ミリ波切替器が検討されている。方形コルゲート導波管を用いた高速ミリ波切替器の分波器が、JT-60SA ECHCDシステムの2周波数運転に向けて設計された。2周波数動作では分波器が重要であり、マッチング係数解析に基づき、分波器の拡張動作領域が調べられた。2周波数で高いマッチング係数($$>$$0.9)をもつ動作領域が見つかり、新たな運転パラメータが提案された。方形コルゲート導波管からの放射電界評価で、大ききサイドローブがないことも確認された。ここでは、2重ループ共振器システムが提案された。

A FAst DIrectional Switch (FADIS) performance based on steep slope in a diplexer function has been considered for dual-frequency (dual-f) applications to switch the transmission line with small frequency control. A diplexer of a FADIS using a Square Corrugated Waveguide (SCW) splitter was designed as one of most attractive candidates for the dual-f operation on the JT-60SA system. The splitter performance was a key issue for the dual-f operation, and extended operation regions in splitter operations have been considered using mode contents analyses based on matching coefficient evaluation. Some operational branches with high matching coefficients ($$>$$ 0.9) were found, and new operation parameters were proposed for the dual-f application. Radiation pattern distributions from the SCW splitter were defined very well with no serious side lobes. Double loop resonant ring system has been proposed with the SCW splitter for the dual-f operation.

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