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Experimental observation of elevated heating in dynamically compressed CH foam

K Falk, C J Fontes, C L Fryer, C W Greeff, M Holec, H M Johns, D S Montgomery, D W Schmidt, M Šmíd2020年Plasma Physics and Controlled FusionIF 2.2出版社

We present an experimental result of significantly increased heating in a laser-driven blastwave experiment carried out at the OMEGA laser facility. Abnormally high temperatures were observed in warm dense CH compared to older experiments and theoretical predictions. The higher temperatures in compressed CH were linked to an improved smoothness of the laser intensity profile, which resulted in better efficiency of the drive and coupling of more energy into the system compared to previous similar experiments. Fifteen beams with combined intensity of ∼7× 1014 W cm−2 and a square intensity profile with 2 ns duration were used to drive a strong shock, which subsequently developed to a blastwave travelling through low density CH foam creating warm dense matter. Multiple diagnostics were used to examine the thermodynamic conditions in the warm dense CH foam. Velocity interferometry (VISAR) and streaked pyrometry (SOP) observed increased blastwave velocities, while x-ray Thomson scattering (XRTS) measured elevated temperatures of 17.5 − 35 eV in compressed CH foam. The experimental results were compared to hydrodynamic simulations and a potential contribution from x-rays to the elevated temperatures in the dense material was considered.

日本語訳

我々は、OMEGAレーザー施設で実施したレーザー駆動爆風波実験において、加熱が大幅に増大したという実験結果を提示する。従来の実験や理論的予測と比較して、CH中で異常に高い温度が観測された。圧縮CH中のより高い温度は、レーザー強度プロファイルの改善された均一性に関連しており、その結果、駆動効率が向上し、以前の実験と比較してより多くのエネルギーが結合された。合計強度約7×10^14 W cm^-2、2 nsの矩形強度プロファイルを持つ15本のビームを用いて強い衝撃波を駆動し、その後、低密度CHフォーム中を伝播する爆風波へと発展し、温かい稠密物質を生成した。温かい稠密CHフォーム中の熱力学的状態を調べるために、複数の診断法が用いられた。速度干渉計(VISAR)とストリーク高温計(SOP)は、爆風波速度の増大を観測し、一方、X線トムソン散乱(XRTS)は、圧縮CHフォーム中で17.5〜35 eVの上昇した温度を測定した。実験結果は流体力学シミュレーションと比較され、稠密物質中の上昇した温度に対するX線の潜在的な寄与が考察された。

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