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※ 半角英数字
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誘電体を利用した透過型大電力用ミリ波電力測定装置の開発

Development of power measuring device of transmission type with dielectric for high power millimeter wave

横倉 賢治; 森山 伸一; 長谷川 浩一; 鈴木 貞明; 平内 慎一; 石井 和宏*; 佐藤 文明

Yokokura, Kenji; Moriyama, Shinichi; Hasegawa, Koichi; Suzuki, Sadaaki; Hiranai, Shinichi; Ishii, Kazuhiro*; Sato, Fumiaki

大電力用ミリ波電力測定装置は、主伝送路の導波管内を伝搬する高周波を直接誘電体に透過させ、誘電体で損失する高周波エネルギーから透過電力を算出する新しい発想の高周波計器であり、高次モードや偏波の変化に計測値が鈍感な特徴を持つ。また、検出素子を適切に選択することで、kW$$sim$$MW級の広範囲の電力測定に柔軟に対応することができる。本報告では、大電力ミリ波による高周波損失が極めて小さい材料を検出素子として選択し、その発熱特性と耐電力性能を評価した結果について記述する。これらの検討結果をもとに、JT-60U, JT-60SA電子サイクロトロン加熱装置への実用化に向けたプロトタイプ電力測定装置の設計と製作を実施したので報告する。

A power measuring device using a dielectric disk for a high power millimeter waves is investigated. In the device, a high power wave is transmitted in a waveguide and then heats a dielectric installed in the waveguide. The transmitted power is estimated from the temperature rise of the dielectric disk. It is a new type of power measurement device, which is not sensitive to higher modes or change of their polarization in time. It also can measure the wide power range of kW to MW levels flexibly by choosing dielectric material proper to the power level as a detector. In the report, materials that have small dielectric loss for millimeter wave are chosen, and their properties of temperature rise and millimeter wave power capacity are estimated. On the basis of these results, design of the power measurement device and fabrication of its prototype are described for practical use in the electron cyclotron heating systems for the JT-60U and JT-60SA.

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