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Title: Transition from Collisional to Collisionless Regimes in Interpenetrating Plasma Flows on the National Ignition Facility

Journal Article · · Physical Review Letters
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
  3. Univ. of Rochester, Rochester, NY (United States)
  4. Kyushu Univ., Fukuoka (Japan)
  5. Osaka Univ., Osaka (Japan)
  6. Univ. of Michigan, Ann Arbor, MI (United States)
  7. Univ. of Oxford, Oxford (United Kingdom)
  8. Ecole Polytechnique, Palaiseau (France)
  9. Princeton Univ., Princeton, NJ (United States)
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  11. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M > 4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6–10 mm are irradiated with laser energies of 250 kJ per foil, generating ~1000 km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane. The characteristics of the flow interaction have been inferred from the neutrons and protons generated by deuteron-deuteron interactions and by x-ray emission from the hot, interpenetrating, and interacting plasmas. A localized burst of neutrons and bright x-ray emission near the midpoint of the counterstreaming flows was observed, suggesting strong heating and the initial stages of shock formation. As the separation of the CD-CH foils increases we observe enhanced neutron production compared to particle-in-cell simulations that include Coulomb collisions, but do not include collective collisionless plasma instabilities. Here, the observed plasma heating and enhanced neutron production is consistent with the initial stages of collisionless shock formation, mediated by the Weibel filamentation instability.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC52-07NA27344; 15-ERD-065
OSTI ID:
1366948
Alternate ID(s):
OSTI ID: 1355971
Report Number(s):
LLNL-JRNL-700999; PRLTAO
Journal Information:
Physical Review Letters, Vol. 118, Issue 18; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (20)

Analytical estimates of proton acceleration in laser-produced turbulent plasmas journal November 2018
Laboratory investigation of particle acceleration and magnetic field compression in collisionless colliding fast plasma flows journal June 2019
Ion species stratification within strong shocks in two-ion plasmas journal March 2018
Scaling laws for dynamical plasma phenomena journal October 2018
Observation of collisionless-to-collisional transition in colliding plasma jets with optical Thomson scattering journal January 2019
Kinetic effects on neutron generation in moderately collisional interpenetrating plasma flows journal January 2019
Full particle-in-cell simulation of the interaction between two plasmas for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers journal March 2019
Kinetic simulations of sheared flow stabilization in high-temperature Z-pinch plasmas journal June 2019
Characterizing filamentary magnetic structures in counter-streaming plasmas by Fourier analysis of proton images journal October 2019
Hybrid particle-in-cell simulations of laser-driven plasma interpenetration, heating, and entrainment journal November 2019
Kinetic physics in ICF: present understanding and future directions journal April 2018
Perpendicular relativistic shocks in magnetized pair plasma journal April 2018
Weibel-mediated Shocks Propagating into Inhomogeneous Electron–Positron Plasmas journal November 2019
Analytical Estimates of Proton Acceleration in Laser-produced Turbulent Plasmas image January 2018
Analytical Estimates of Proton Acceleration in Laser-produced Turbulent Plasmas image January 2018
Perpendicular relativistic shocks in magnetized pair plasma text January 2017
Ion Species Stratification Within Strong Shocks in Two-Ion Plasmas text January 2017
Disruption of current filaments and isotropization of magnetic field in counter-streaming plasmas text January 2018
Experimental Measurements of Ion Heating in Collisional Plasma Shocks and Interpenetrating Supersonic Plasma Flows text January 2018
Characterizing filamentary magnetic structures in counter-streaming plasmas by Fourier analysis of proton images text January 2019

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