Experimental Investigations of Shock Surface Perturbations in Laser Produced Plasmas(3/3)

Project Details

Description

Collisionless shocks are ubiquitous in various phenomena in astrophysical, space and evenlaboratory plasmas. It is widely believed that energetic particles in the universe or cosmic rays areaccelerated at collisionless shocks. At the very initial stage of the particle acceleration or theso-called injection process at collisionless shocks, some particles have to come back to the shockupstream, and thus, the particle reflection at the shock surface is essential in the injection process.The reflected particles can cause a number of instabilities and reformation of shock, resulting inshock surface perturbations. Although a number of analytic and numerical studies show the shocksurface perturbations and relevant particle acceleration and reflections, it is hard to observe this inspace and astrophysical plasmas. In this project we experimentally investigate the shock surfaceperturbations in laser-produced plasmas and observe the reflected or back streaming particles. Wefocus on the shock Mach number and the magnetic field orientation to the shock surface, which canbe controlled with the laser energy and target configurations with permanent magnets. We observethe shock images with optical diagnostics and local plasma quantities with Thomson scattering. Theenergy distribution functions of the reflected particles are measured with electron-ion spectrometers.We clarify the dependence of the shock surface perturbations on the shock Mach number and thefield orientation, and the relation between the shock surface perturbations and the particleacceleration.
StatusFinished
Effective start/end date1/08/1831/07/19

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 3 - Good Health and Well-being
  • SDG 8 - Decent Work and Economic Growth
  • SDG 17 - Partnerships for the Goals

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  • Magnetic reconnection driven by electron dynamics

    Kuramitsu, Y., Moritaka, T., Sakawa, Y., Morita, T., Sano, T., Koenig, M., Gregory, C. D., Woolsey, N., Tomita, K., Takabe, H., Liu, Y. L., Chen, S. H., Matsukiyo, S. & Hoshino, M., 1 Dec 2018, In: Nature Communications. 9, 1, 5109.

    Research output: Contribution to journalArticlepeer-review

    Open Access
    12 Scopus citations