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Generation of disc-like plasma from laser-matter interaction in the presence of a strong external magnetic field

V V Ivanov, A V Maximov, R Betti, P P Wiewior, P Hakel, M E Sherrill2017年Plasma Physics and Controlled FusionIF 2.2出版社

Dynamics of laser produced plasma in a strong magnetic field was studied using a 1 MA pulsed power generator coupled to an intense, high-energy laser. A 2–2.5 MG magnetic field was generated on the surface of a rod load 0.8–1.2 mm in diameter. A sub-nanosecond laser pulse with intensity of 3 × 1015 W cm−2 was focused on the rod load surface. Side-on laser diagnostics showed the generation of two collimated jets 1–3 mm long on the front and rear sides of the load. End-on laser diagnostics reveal that the laser produced plasma in the MG magnetic field takes the form of a thin disc as the plasma propagates along the magnetic field lines. The disc-like plasma expands radially across the magnetic field with a velocity of 250 km s−1. An electron temperature of 400 eV was measured in the laser-produced plasma on the rod load.

日本語訳

1 MAのパルスパワー発生装置と高強度・高エネルギーレーザーを組み合わせて、強磁場中におけるレーザー生成プラズマのダイナミクスを研究した。直径0.8~1.2 mmのロッド負荷表面に2~2.5 MGの磁場を発生させた。サブナノ秒レーザーパルス(強度3×10¹⁵ W cm⁻²)をロッド負荷表面に集光した。側面からのレーザー診断により、負荷の前面と背面に長さ1~3 mmの2つのコリメートされたジェットの生成が観測された。端面からのレーザー診断により、MG磁場中のレーザー生成プラズマは、プラズマが磁力線に沿って伝播するにつれて薄い円盤状を呈することが明らかになった。円盤状プラズマは磁場を横切って250 km s⁻¹の速度で半径方向に膨張する。ロッド負荷上のレーザー生成プラズマにおいて、電子温度400 eVが測定された。

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