High repetition rate mapping of the interaction between a laser plasma and magnetized background plasma via laser induced fluorescence
Abstract
The laminar coupling of energy between a laser-produced plasma and a background magnetized plasma was investigated via planar laser induced fluorescence diagnostic and magnetic flux probes. Experiments performed on the Large Plasma Device at the University of California, Los Angeles, mapped out the two-dimensional spatiotemporal evolution of the laser-plasma (debris) ion velocity distribution function (VDF) to assess debris-background coupling in a sub-Alfvénic regime. The acquisition of these data necessitates high repetition rate (1 Hz) as each dataset is the accumulation of thousands of laser shots, which would not be feasible in single-shot experiments. Fully kinetic, three-dimensional particle-in-cell simulations are compared to the measured VDFs to provide a framework in which we can understand the coupling of a sub-Alfvénic plasma flow through a preformed, magnetized plasma. The simulations display the same departure from the expected gyromotion of the debris plasma as observed in the experimental data, and in conjunction with the measured magnetic field traces, have led to the direct observation of the collisionless coupling via laminar fields.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2022
- Source ID
- 10.1063/5.0097748
Entities
People
- A. Lê
- C. G. Constantin
- Christoph Niemann
- D. Winske
- David Jeffrey Larson
- Derek Schaeffer
- J. J. Pilgram
- Misa Cowee
- R S Dorst
- Shreekrishna Tripathi
- Stephen Vincena
Organizations
- Defense Threat Reduction Agency
- Lawrence Livermore National Laboratory
- Los Alamos National Laboratory
- Princeton University
- United States Department of Energy
- University of California, Los Angeles