Collisionless electrostatic shock generation using high-energy laser systems

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

Research output: Contribution to journalReview article

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)425-443
Number of pages19
JournalAdvances in Physics: X
Volume1
Issue number3
DOIs
Publication statusPublished - May 3 2016

Fingerprint

shock
electrostatics
lasers
energy
space plasmas
radiography
astrophysics
ions
protons
electric fields
Thomson scattering
ion temperature
mean free path
magnetohydrodynamics
upstream
plasma density
cosmic rays
counters
flow velocity
solitary waves

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Collisionless electrostatic shock generation using high-energy laser systems. / Sakawa, Y.; Morita, Taichi; Kuramitsu, Y.; Takabe, H.

In: Advances in Physics: X, Vol. 1, No. 3, 03.05.2016, p. 425-443.

Research output: Contribution to journalReview article

Sakawa, Y. ; Morita, Taichi ; Kuramitsu, Y. ; Takabe, H. / Collisionless electrostatic shock generation using high-energy laser systems. In: Advances in Physics: X. 2016 ; Vol. 1, No. 3. pp. 425-443.
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