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High-Mach number collisionless shock and photo-ionized non-LTE plasma for laboratory astrophysics with intense lasers

H Takabe, T N Kato, Y Sakawa, Y Kuramitsu, T Morita, T Kadono, K Shigemori, K Otani, H Nagatomo, T Norimatsu2008年Plasma Physics and Controlled FusionIF 2.2出版社

We propose that most of the collisionless shocks in the Universe, for example, supernova remnant shocks, are produced because of the magnetic field generated by Weibel instability and its nonlinear process. In order to verify and validate the computational result confirming this theory, we are carrying out model experiments with intense lasers. We are going to make a collisionless counter-streaming plasma with intense laser ablation based on the scaling law to laser plasma with the particle-in-cell simulation resulting in Weibel-mediated shock formation. Preliminary experimental data are shown. The photo-ionization and resultant non-LTE plasma physics are also very important subjects in astrophysics related to mainly compact objects, for example, black hole, neutron star and white dwarf. Planckian radiation with its temperature 80–100 eV has been produced in gold cavity with irradiation of intense lasers inside the cavity. The sample materials are irradiated by the radiation inside the cavity and absorption and self-emission spectra are observed and analyzed theoretically. It is demonstrated how the effect of non-LTE is essential to reproduce the experimental spectra with the use of a precision computational code.

日本語訳

我々は、宇宙における無衝突衝撃波の大部分、例えば超新星残骸衝撃波は、ワイベル不安定性とその非線形過程によって生成される磁場に起因すると提案する。この理論を裏付ける計算結果を検証・確認するため、我々は高強度レーザーを用いたモデル実験を実施している。我々は、レーザーアブレーションに基づくスケーリング則を用いて、粒子セル法シミュレーションによりワイベル媒介衝撃波形成を再現する無衝突対向プラズマ流を生成しようとしている。予備的な実験データを示す。また、光電離とそれに伴う非局所熱平衡プラズマ物理は、主にコンパクト天体、例えばブラックホール、中性子星、白色矮星に関連する天体物理学において極めて重要なテーマである。温度80~100 eVのプランク放射が、高強度レーザーの照射による空洞内部で生成されている。この放射によって試料物質が照射され、その吸収スペクトルと自発光スペクトルが観測され、理論的に解析されている。高精度計算コードを用いることで、非局所熱平衡の効果が実験スペクトルを再現するために不可欠であることが実証されている。

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