Collisionless electrostatic shock generation using high-energy laser systems

Y. Sakawa, T. Morita, Y. Kuramitsu, H. Takabe

研究成果: Contribution to journalReview article査読

12 被引用数 (Scopus)

抄録

Collisionless shock is ubiquitous in space and astrophysical plasmas, and is believed to be a source of cosmic rays. In this review article, historical achievements of three different types of collisionless shocks, i.e. magnetohydrodynamic, electromagnetic, and electrostatic (ES) shocks, in theory/simulation, observation in space and astrophysical plasmas, and laboratory experiments are shown. An overview is given on recent progress of collisionless ES shock experiments using high-energy laser systems for two schemes. One is an interaction between laser-produced high-density ablating plasma and a low-density ambient plasma, and the other is an interaction between laser-ablated counter-streaming plasmas using double-plane target. For the former scheme, detailed measurements of structures of collisionless ES shock and ion-acoustic soliton, and the transition from double-layer to collisionless ES shock are conducted by proton radiography. For the latter scheme, optical diagnostics are used to observe global structures of plasmas and shocks; collective laser Thomson scattering method is applied to clarify local plasma parameters, such as electron and ion temperatures, flow velocity, and electron density; and proton radiography is employed to measure a shock electric field. The measured large density-jump, steepening of self-emission profile, plasma parameters in the up- and down-stream regions of a shock, and the narrow width of the shock electric field compared with the ion-ion Coulomb mean-free-path reveal the evidence for the formation of collisionless ES shock.

本文言語英語
ページ(範囲)425-443
ページ数19
ジャーナルAdvances in Physics: X
1
3
DOI
出版ステータス出版済み - 5 3 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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