Delayed Emission Exited by a High Power Microwave Pulse-2-

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タイトル別名
  • Delayed Emission Excited by a High Power Microwave Pulse (II)
  • Delayed Emission Exited by a High Power

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高密度磁化プラズマに大出力マイクロ波パルスを,その入射周波数がプラズマ周波数にほぼ等しくかつサイクトロン周波数の整数倍に等しいという条件の下で打ち込むと入射終了後,プラズマからマイクロ波帯のエミッションが戻ってくる.

An experiment is performed to study the interaction of a high power microwave pulse with a magnetized dense plasma. A delayed emission appears after the complete termination of a pumping microwave pulse when the frequency of the pumping wave is equal to the harmonics of the cyclotron frequency and is near the plasma frequency. Three types of the delayed emission (type I, II, III) are observed, depending on the experimental conditions. Type I delayed emission is characterized by the frequency spectrum with sharp peaks at cyclotron harmonics (mf_<ce>:m = 1, 2, …), type II with broad peaks between (m + 1/2)f_<ce> and (m + 1) f_<ce> and type III with broad peak between 0.8 f_<ce> and f_<ce> Main properties of these phenomena are explained in terms of anomalous power absorption af cyclotron harmonic resonances and excitation of electron plasma waves by an anisotropic electron velocity distribution. Each type of the delayed emission can be triggered artificially by a sudden decrease of cold background plasma density and is suppressed by an increase of cold plasma. It can be also triggered by a pulsed electron beam.

資料番号: SA0124527000

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