High power experiments of remote steering launcher for electron cyclotron heating and current drive

電子サイクロトロン波加熱電流駆動用遠隔駆動型ランチャーの大電力実験

高橋 幸司; Moeller, C. P.*; 坂本 慶司; 林 健一*; 今井 剛

Takahashi, Koji; Moeller, C. P.*; Sakamoto, Keishi; Hayashi, Kenichi*; Imai, Tsuyoshi

ECH/CDシステム用遠隔駆動型ランチャーは長さ4632mm,断面が47.545.7mmの矩形導波管と導波管入口に位置する可動ミラーからなり、その原理検証のために大電力試験を行った。放射角度範囲0-10で低電力結果と一致するガウシアン形状のRFビーム放射を確認した。また、0.5MW-3.0sec, 0.2MW-10secという大電力長パルス放射にも成功した。ランチャー内で、実験中のアークや実験後のダメージは確認されず、遠隔駆動型ランチャーの大電力放射・伝送を実証するとともにその有効性を確証した。

High power radiation experiments of a remote steering launcher for an EC H&CD system were carried out to study the characteristic of the rf beam steering and transmission. The remote steering launcher consists of a 4.632m corrugated square waveguide (45.7 45.7mm) and a movable flat mirror which is placed at the input of the waveguide. Measurements were made in the range 0-10 at a frequency of 170GHz. The measured radiation pattern is clearly a Gaussian-like distribution, which is in agreement with the low power measurements. A steering capability of up to 10 was experimentally confirmed. Transmission and radiation of 0.5 MW-3.0 sec and 0.2 MW-10.0 sec pulses were successfully demonstrated over a steering angle range of 0-10. No arcing was observed during the experiments and no damage to the waveguide was found after the experiments were finished. We confirmed that remote steering was a possibly alternative scheme of rf beam steering for EC H&CD.