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Scaling of the emission of low frequency radiation by transient surface currents in laser–solid interactions

A P L Robinson2024年10月Plasma Physics and Controlled FusionIF 2.2出版社

It has been suggested that 'transient surface currents' caused by multi-MeV fast electrons can be responsible for the emission of low frequency radiation (e.g. in THz range) from ultra-intense laser–solid interactions. This mechanism has been analyzed, and analytic upper bounds on the intensity, electric field amplitude, and normalized vector potential have been developed and tested against 1D EM Particle-in-Cell simulations. The 'transient surface current' mechanism is effective and sufficiently efficient to fully account for all radiation that has been emitted in experiments so far.

日本語訳

『過渡的表面電流』が、多MeVの高速電子によって引き起こされ、超高強度レーザー–固体相互作用からの低周波放射(例えばTHz領域)の放出の原因となり得ることが示唆されてきた。このメカニズムは解析され、強度、電場振幅、および規格化ベクトルポテンシャルに関する解析的上限が導出され、1次元電磁Particle-in-Cellシミュレーションと照合して検証された。『過渡的表面電流』メカニズムは有効かつ十分に効率的であり、これまでの実験で放出されたすべての放射を完全に説明することができる。

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