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Control of fast electron propagation in foam target by high-Z doping

H Xu, X H Yang, J Liu, M Borghesi2019年Plasma Physics and Controlled FusionIF 2.2出版社

The influence of high-Z dopant (bromine) in low-Z foam (polystyrene) target on laser-driven fast electron propagation is studied by the 3D hybrid particle-in-cell (PIC)/fluid code HEETS. It is found that the fast electrons are better confined in doped targets due to the increasing resistivity of the target, which induces a stronger resistive magnetic field which acts to collimate the fast electron propagation. The energy deposition of fast electrons into the background target is increased slightly in the doped target, which is beneficial for applications requiring long distance propagation of fast electrons, such as fast ignition.

日本語訳

高Zドーパント(臭素)を含む低Zフォーム(ポリスチレン)ターゲットにおけるレーザー駆動高速電子の伝播を、3次元ハイブリッド粒子・流体コードHEETSを用いて研究した。高速電子は、ターゲットの抵抗率の増加により、ドープされたターゲット内でより良く閉じ込められることが見出された。この抵抗率の増加は、より強い抵抗性磁場を誘起し、高速電子の伝播をコリメートする作用を持つ。高速電子の背景ターゲットへのエネルギー沈着は、ドープされたターゲット内でわずかに増加し、これは高速点火のような長距離伝播を必要とする応用にとって有益である。

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