[P-EM33_1AM1] Plasma Astrophysics: observational/experimental design & method, equipment development, diagnostics

[PEM33-05] Experimental study on collisionless shocks with high-power laser system "Gekko-XII"

*Taichi MORITA¹, Youichi SAKAWA¹, Taishi ISHIKAWA¹, Yuta YAMAURA¹, Takayoshi SANO¹, Toseo MORITAKA¹, Kentaro TOMITA², Ryo SHIMODA², Yuta SATO², Shuichi MATSUKIYO², Shogo ISAYAMA², Daisuke HARADA², Tatsuya OYAMA², Ryosuke FUJINO², Yasuhiro KURAMITSU³, Hiroki YONEDA⁴, Kazuyoshi NAGAMINE⁴, Michel KOENIG⁵, Roman YURCHAK⁵, Claire MICHAUT⁶, Nigel WOOLSEY⁷, Robert CROWSTON⁷, Alexander PELKA⁸, Yutong LI⁹, Dawei YUAN⁹, Chuanlei YIN⁹, Jiayong ZHONG¹⁰, Kai ZHANG¹⁰, Hideaki TAKABE¹ (1.Institute of Laser Engineering, Osaka University, 2.Kyushu University, 3.National Central University, 4.Institute for Laser Science, University of Electro-communications, 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)

Keywords:collisionless shock, laser, plasma, diagnostics

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.