Proton imaging of an electrostatic field structure formed in laser-produced counter-streaming plasmas

[摘要] We report the measurements of electrostatic field structures associated with an electrostatic shock formed in laser-produced counter-streaming plasmas with proton imaging. The thickness of the electrostatic structure is estimated from proton images with different proton kinetic energies from 4.7 MeV to 10.7 MeV. The width of the transition region is characterized by electron scale length in the laser-produced plasma, suggesting that the field structure is formed due to a collisionless electrostatic shock.

[发布机构] Department of Energy Engineering Science, Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka; 816-8580, Japan^1;Lawrence Livermore National Laboratory, P.O. Box 808, Livermore; CA; 94550, United States^2;Department of Atmospheric Oceanic and Space Sciences, University of Michigan, Ann Arbor; MI; 48109, United States^3;University of York, North-Yorkshire-York; YO10 5DD, United Kingdom^4;Department of Physics, University of Oxford, Parks Road, Oxford; OX1 3PU, United Kingdom^5;Graduate School of Science, Osaka University, 1-1 Machikane-yama, Osaka Toyonaka; 560-0043, Japan^6;Laboratoire pour l'Utilisation des Lasers Intenses (LULI), École Polytechnique-Univ, Paris VI, Palaiseau; 91128, France^7;Rice University, Houston; TX; 77251, United States^8;Physics Department, ETH-Zürich, Wolfgang-Pauli-Strasse 27, Zürich; CH-8093, Switzerland; (10) University of Edinburgh, Edinburgh; EH8 9YL, United Kingdom; (11) University of Nevada, Reno; NV; 89557, United States; (12) Centre for Plasma Physics, Queen's University Belfast, University Rd, Belfast; BT7 1NN, United Kingdom; (13) Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Osaka Suita; 565-0871, Japan; (14) University of California, Davis; CA; 95616, United States^9

[关键词] Collisionless;Electrostatic shocks;Field structures;Measurements of;Proton imaging;Proton kinetic energies;Streaming plasma;Transition regions