Research and development on the technologies for transport and application of “Giga-watts-class short-pulse microwave"

“千兆瓦级短脉冲微波”传输及应用技术研发

• 批准号: 17540466
• 负责人: ANDO Ritoku
• 金额: $ 2.46万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17540466/
• 关键词: High Power Microwave; plasma; superradiance; Vlasov antenna; quasi-optical antenna; BWO; Backward wave oscillator; radar diagnostic; 大出力短パルスマイクロ波; 変換効率; 後進波発振管; マイクロ波アブレーション; 大強度短パルス; プラズマ生成; マイクロ波; アブレーション; ガウスビーム; 準光学; ブラソフアンテナ

New type of high power microwave sources, HPM, are recently proposed by Russian theorist and developed by us. This type of HPM is characterized by a strong sharp pulse. The oscillator of HPM is operated in superradiative regime, “SR" In the SR regime, energy flows from electron beam to HPM in one direction, and is not reversed. The HPM has strong electric field, though the total joule per one pulse is low. The peak power of HPM is a few Mega-watts to a few Giga-watts, which is about thousands times larger than the constant wave type oscillators. It can induce breakdown in the gas in free space, and produces plasma. The application is not only for radar (radio detection and ranging), for example, diagnostic in large and high temperature plasma. HPM will realize other unique methods to basic plasma science. It can be applied to plasma production in free space, study on non-linear phenomena, ablation on dielectric surface, etc. In this research, we studied the generation that includes SR, and the transport for these applications.Backward wave oscillator, BWO, is one of the most powerful microwave source for Giga-watts. Powerful BWO is already developed for HPM of 5 GHz by us. This time, the power became much higher. BWO for higher frequency, 10 GHz, is newly developed to achieve higher power density in free space.A quasi-optical antenna, called “Vlasov antenna", is studied intensively in this research. It makes possible launching HPM from waveguides to free space. Several antenna designs are tested and its conversion efficiency is investigated at the wavelength 6 cm, i. e. 5 GHz. The wavelength is not short compared to the diameter of wave guide. The conversion efficiency can be improved by increasing the diameter of the final waveguide. It changes from 15% to 75% in the experiment.

新型高功率微波源HPM是最近由俄罗斯理论家提出并由我们研制的。这种类型的HPM的特征在于强烈的尖脉冲。HPM的振荡器工作在超辐射区（SR），在SR区，能量从电子束流向HPM，在一个方向上，而不是相反。HPM具有强电场，但每个脉冲的总焦耳较低。HPM的峰值功率为几兆瓦到几千兆瓦，这比恒定波型振荡器大大约数千倍。它可以在自由空间中诱导气体击穿，并产生等离子体。该应用不仅适用于雷达（无线电探测和测距），例如，大型高温等离子体的诊断。HPM将实现基础等离子体科学的其他独特方法。它可以应用于自由空间等离子体的产生、非线性现象的研究、电介质表面的烧蚀等。在本研究中，我们研究了这些应用中包括SR的产生和输运。返波振荡器（Backward Wave Oscillator，BWO）是目前功率最大的千兆瓦级微波源之一。我们已经研制出适用于5GHz高功率微波的大功率返波管。这一次，力量变得更强了。10 GHz返波振荡器是近年来发展起来的一种在自由空间实现高功率密度的返波振荡器，本文重点研究了一种称为“弗拉索夫天线”的准光学天线。这使得从波导向自由空间发射HPM成为可能。测试了几种天线的设计，并在波长为6 cm，即100 nm处研究了其转换效率。e. 5 GHz。与波导的直径相比，波长并不短。可以通过增加最终波导的直径来提高转换效率。在实验中，它从15%变化到75%。

项目成果

準光学アンテナの5GHzマイクロ波での使用と変換効率向上

5GHz微波中准光天线的使用及转换效率的提高

• 发表时间: 2007
• 作者: Chen;B.;Arakawa;Y.;T.Cho et al.;栗原 智章
• 通讯作者: 栗原 智章

S-band Superradiance in Slow Wave Structure.

慢波结构中的 S 波段超辐射。

• 期刊: Proc.of 6 th Int.Workshop on Strong Microwaves in Plasmas, (Nizhny Novgorod, Russia July. 2005) (now printing.)
• 作者: K.Kamada;K.Ymamoto;R.Nakajima;R.Ando;I.V.Zotova;R.M.Rozental;A.S.Sergeev;N.S.Ginzburg
• 通讯作者: N.S.Ginzburg

1OGHzの大強度マイクロ波発振に向けた発振管の開発

1OGHz高强度微波振荡用振荡管的研制

• 发表时间: 2007
• 作者: Shinmura;T.;Arakawa;Y.;Kobayashi;Y.;T.Cho et al.;大林 雅俊
• 通讯作者: 大林 雅俊

応用研究に向けた準光学アンテナによる5GHzマイクロ波のモード変換

利用准光天线进行5GHz微波模式转换的应用研究

• 发表时间: 2008
• 作者: 栗原 智章;他4名
• 通讯作者: 他4名

ブラソフアンテナの長波長帯での利用と変換損失について

关于Vlasov天线在长波段的使用及转换损耗

• 发表时间: 2007
• 作者: Matsui;T.;Arakawa;Y.;Kimata;M.;Nishida;N. and Hatta;T.;T.Cho et al.;松井智章・荒川洋二・木股三善・西田憲正・八田珠郎;栗原 智章
• 通讯作者: 栗原 智章