[P-EM33_1AM1] プラズマ宇宙：観測・実験の計画・手法，装置開発，プラズマ計測

[PEM33-05] 激光XII号レーザーを用いた無衝突衝撃波の実験的研究

*森田 太智¹、坂和 洋一¹、石川 大志¹、山浦 祐太¹、佐野 孝好¹、森高 外征雄¹、富田 健太郎²、下田 諒²、佐藤 裕太²、松清 修一²、諌山 翔伍²、原田 大輔²、大山 達也²、藤野 亮佑²、蔵満 康浩³、米田 仁紀⁴、長嶺 和慶⁴、Koenig Michel⁵、Yurchak Roman⁵、Michaut Claire⁶、Woolsey Nigel⁷、Crowston Robert⁷、Pelka Alexander⁸、Li Yutong⁹、Yuan Dawei⁹、Yin Chuanlei⁹、Zhong Jiayong¹⁰、Zhang Kai¹⁰、高部 英明¹ (1.大阪大学レーザーエネルギー学研究センター、2.九州大学、3.国立中央大学、4.電気通信大学レーザー新世代研究センター、5.LULI, Ecole Polytechnique、6.LUTH, Observatoire de Paris、7.University of York、8.Helmholtz-Zentrum Dresden-Rossendorf、9.Institute of Physics, Chinese Academy of Science、10.National Astronomical Observatory, Chinese Academy of Science)

キーワード：無衝突衝撃波, レーザー, プラズマ, プラズマ計測

Collisionless shocks play significant roles in particle acceleration, for example, in Earth's bow shock and Supernova remnant shocks. In collisionless shocks, collisions between particles can not account for the formation mechanism and particle?field interactions are essential. Therefore, the shock thickness is much smaller than ion-ion mean free path and a large electromagnetic field exists at the vicinity of the shock. Laboratory experiments with high-power laser systems can be alternative to observations or in-situ measurements by satellites. Collisionless shocks have been produced and investigated in counter-streaming laser-produced plasmas. To investigate collisionless shocks, the measurements of an electric or magnetic field and of fundamental plasma parameters are required. Shocks have been measured by optical diagnostics such as interferometry, shadowgraphy, optical pyrometry, and Thomson scattering to obtain the fundamental plasma parameters: density, temperature, charge state, and flow velocity. We will present recent results from series of our experiments on collisionless shocks with Gekko-XII laser system.