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The control of laser-plasma parametric instabilities and thetemperature of suprathermal electrons with ultrabroad bandwidth frequencymodulated laser pulse

Yanqing Wu, Shensheng Han, Xiangyang Song, Zhizhan Xu, Yuhui Tang, Bing Shuai2001年Plasma Physics and Controlled FusionIF 2.2出版社

The development of the capability of selectively exciting or suppressing aspecific laser-plasma parametric instability will result in a betterunderstanding on the rich interplay between laser-plasma instabilities,nonlinear wave collapse and strong turbulence; it is also very important toinertial confinement fusion target designs and other advanced applications.The progress in the development of ultraintense, ultrashort pulse lasers hasallowed for the exploration of many new regimes in the field of laser-plasmainteraction. In this paper, one of the possible applications of the ultrabroadbandwidth associated with these ultrashort laser pulses were explored. Thebehaviour of ultrabroad bandwidth frequency modulated (UBFM) laser excitedsimulated Raman scattering (SRS)was studied using a 1½D electromagnetic particle-in-cell code. Theresults show that, according to the properties of parametric instability, onecan already either enhance or reduce the intensity of selected instability forvarious applications by a readily available UBFM laser pulse.

日本語訳

レーザー・プラズマ不安定性を選択的に励起または抑制する能力の開発は、レーザー・プラズマ不安定性、非線形波動崩壊、強乱流の間の豊かな相互作用に対するより深い理解をもたらすであろう。また、これは慣性閉じ込め核融合ターゲット設計やその他の先進的応用にとって極めて重要である。超高強度、超広帯域レーザーパルスの発展により、多くの新しい領域の探索が可能となった。本論文では、超広帯域周波数変調(UBFM)レーザー励起による誘導ラマン散乱(SRS)を、1½次元電磁粒子セル(PIC)コードを用いて研究した。結果は、パラメトリック不安定性の特性に基づき、UBFMレーザーパルスが特定の不安定性を選択的に励起または抑制できることを示している。

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Laser plasmaParametric instabilities
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