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Spectral and temporal characteristics of target current and electromagnetic pulse induced by nanosecond laser ablation

J Krása, M De Marco, J Cikhardt, M Pfeifer, A Velyhan, D Klír, K Řezáč, J Limpouch, E Krouský, J Dostál2017年Plasma Physics and Controlled FusionIF 2.2出版社

The current balancing the target charging and the emission of transient electromagnetic pulses (EMP) driven by the interaction of a focused 1.315 μm iodine 300 ps PALS laser with metallic and plastic targets were measured with the use of inductive probes. It is experimentally proven that the duration of return target currents and EMPs is much longer than the duration of laser-target interaction. The laser-produced plasma is active after the laser-target interaction. During this phase, the target acts as a virtual cathode and the plasma-target interface expands. A double exponential function is used in order to obtain the temporal characteristics of EMP. The rise time of EMPs fluctuates in the range up to a few tens of nanoseconds. Frequency spectra of EMP and target currents are modified by resonant frequencies of the interaction chamber.

日本語訳

集束された1.315 μmヨウ素300 ps PALSレーザーと金属およびプラスチックターゲットとの相互作用によって駆動される、ターゲット充電と過渡電磁パルス(EMP)の放出のバランスを、誘導プローブを用いて測定した。ターゲット電流とEMPの帰還時間は、レーザーとターゲットの相互作用時間よりもはるかに長いことが実験的に証明された。レーザー生成プラズマは、この相互作用期間後も活性を維持する。この段階では、ターゲットが仮想陰極として機能し、プラズマとターゲットの界面が拡張する。EMPの時間特性を得るために、二重指数関数が使用された。EMPの立ち上がり時間は、数十ナノ秒の範囲で変動する。EMPとターゲット電流の周波数スペクトルは、相互作用チャンバーの共振周波数によって変調される。

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