High-power laser experiment forming a supercritical collisionless shock in a magnetized uniform plasma at rest

Jan 19, 2022
17 pages
Published in:
  • Phys.Rev.E 105 (2022) 2, 025203
  • Published: Feb 11, 2022
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Abstract: (APS)
We present an experimental method to generate quasiperpendicular supercritical magnetized collisionless shocks. In our experiment, ambient nitrogen (N) plasma is at rest and well magnetized, and it has uniform mass density. The plasma is pushed by laser-driven ablation aluminum (Al) plasma. Streaked optical pyrometry and spatially resolved laser collective Thomson scattering clarify structures of plasma density and temperatures, which are compared with one-dimensional particle-in-cell simulations. It is indicated that just after the laser irradiation, the Al plasma is magnetized by a self-generated Biermann battery field, and the plasma slaps the incident N plasma. The compressed external field in the N plasma reflects N ions, leading to counterstreaming magnetized N flows. Namely, we identify the edge of the reflected N ions. Such interacting plasmas form a magnetized collisionless shock.
Note:
  • 17 pages, 12 figures, 1 table. Physical Review E, in press