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Lensless passive and active microwave imaging on MAST

S J Freethy, B K Huang, V F Shevchenko, R G L Vann2013年Plasma Physics and Controlled FusionIF 2.2出版社

A novel microwave imaging system (SAMI) which utilizes an array of phase sensitive antennas to synthesize an optical aperture has been designed and deployed on MAST. The system requires no optical components for focusing and yet is able to image up to half of the plasma surface simultaneously. All image formation is done in post processing and SAMI can be refocused after the fact. SAMI is capable of imaging both passive thermal emission and scattered radiation from an active probing source simultaneously without compromising performance. We have used the diagnostic to observe highly anisotropic thermal emission characteristic of high β plasma devices which are overdense to regular ECE emission. This is an exciting emerging diagnostic field and we present our first observations here.

日本語訳

MASTにおいて、位相感応アンテナのアレイを用いて光学開口を合成する新規マイクロ波イメージングシステム(SAMI)を設計し、配備した。本システムは、集束のための光学部品を必要とせず、プラズマ表面の最大半分を同時にイメージングすることができる。すべての画像形成は後処理で行われ、SAMIは事後的に再集束が可能である。SAMIは、受動的な熱放射と能動的な探査源からの散乱放射の両方を、性能を損なうことなく同時にイメージングすることができる。我々は、通常のECEに対して過密な高ベータプラズマ装置に特徴的な、高度に異方性のある熱放射を観測するために本診断法を用いた。これは新興の有望な診断分野であり、ここに最初の観測結果を報告する。

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