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Ahmed, H; Dieckmann, M E; Romagnani, L; Doria, D; Sarri, G; Cerchez, M; Ianni, E; Kourakis, I; Giesecke, A L; Notley, M; Prasad, R; Quinn, K; Willi, O; Borghesi, M
Physical review letters, 05/2013, Letnik: 110, Številka: 20Journal Article
We report on the temporally and spatially resolved detection of the precursory stages that lead to the formation of an unmagnetized, supercritical collisionless shock in a laser-driven laboratory experiment. The measured evolution of the electrostatic potential associated with the shock unveils the transition from a current free double layer into a symmetric shock structure, stabilized by ion reflection at the shock front. Supported by a matching particle-in-cell simulation and theoretical considerations, we suggest that this process is analogous to ion reflection at supercritical collisionless shocks in supernova remnants.
