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Title: Spherical strong-shock generation for shock-ignition inertial fusion

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4920956· OSTI ID:1186653
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  1. Univ. of Rochester, Rochester, NY (United States)
  2. CEA, DAM, DIF, Arpajon (France)
  3. Univ. de Bordeaux, Talence (France)
  4. Univ. of California, San Diego, La Jolla, CA (United States)
  5. General Atomics, San Diego, CA (United States)

Recent experiments on the Laboratory for Laser Energetics’ OMEGA laser have been carried out to produce strong shocks in solid spherical targets with direct laser illumination. The shocks are launched at pressures of several hundred Mbars and reach Gbar upon convergence. The results are relevant to the validation of the shock-ignition scheme and to the development of an OMEGA experimental platform to study material properties at Gbar pressures. The experiments investigate the strength of the ablation pressure and the hot-electron production at incident laser intensities of ~2 to 6 x 10¹⁵W/cm² and demonstrate ablation pressures exceeding 300 Mbar, which is crucial to developing a shock-ignition target design for the National Ignition Facility. The timing of the x-ray flash from shock convergence in the center of the solid plastic target is used to infer the ablation and shock pressures. Laser–plasma instabilities produce hot-electrons with a moderate temperature (<100 keV). The instantaneous conversion efficiencies of laser power into hot-electron power reached up to ~15% in the intensity spike. The large amount of hot electrons is correlated with an earlier x-ray flash and a strong increase in its magnitude. This suggests that hot electrons contribute to the augmentation of the shock strength.

Research Organization:
Univ. of Rochester, NY (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
NA0001944
OSTI ID:
1186653
Journal Information:
Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 47 works
Citation information provided by
Web of Science

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Cited By (10)

Inertial-confinement fusion with lasers journal May 2016
Characterization of suprathermal electrons inside a laser accelerated plasma via highly-resolved K⍺-emission journal September 2019
Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition journal December 2017
The role of hot electrons in the dynamics of a laser-driven strong converging shock journal November 2017
Measurements of parametric instabilities at laser intensities relevant to strong shock generation journal January 2018
The control of hot-electron preheat in shock-ignition implosions journal May 2018
Challenges of x-ray spectroscopy in investigations of matter under extreme conditions journal March 2019
A ten-inch manipulator (TIM) based fast-electron spectrometer with multiple viewing angles (OU-ESM) journal June 2019
Suprathermal electron production in laser-irradiated Cu targets characterized by combined methods of x-ray imaging and spectroscopy journal June 2016
Transition from two-plasmon decay to stimulated Raman scattering under ignition conditions journal November 2019

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