학술논문
Pump-depletion dynamics and saturation of stimulated Brillouin scattering in shock ignition relevant experiments.
Document Type
Academic Journal
Author
Zhang S; Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA.; Li J; Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA.; Krauland CM; Inertial Fusion Technology, General Atomics, San Diego, California 92121, USA.; Beg FN; Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA.; Muller S; Inertial Fusion Technology, General Atomics, San Diego, California 92121, USA.; Theobald W; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Palastro J; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Filkins T; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Turnbull D; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Haberberger D; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Ren C; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.; Betti R; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.; Stoeckl C; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Campbell EM; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.; Trela J; Centre Lasers Intenses et Applications, CELIA, Université de Bordeaux CEA-CNRS, 33405 Talence, France.; Batani D; Centre Lasers Intenses et Applications, CELIA, Université de Bordeaux CEA-CNRS, 33405 Talence, France.; Scott RHH; Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, United Kingdom.; Wei MS; Inertial Fusion Technology, General Atomics, San Diego, California 92121, USA.; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
Source
Publisher: American Physical Society Country of Publication: United States NLM ID: 101676019 Publication Model: Print Cited Medium: Internet ISSN: 2470-0053 (Electronic) Linking ISSN: 24700045 NLM ISO Abbreviation: Phys Rev E Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
As an alternative inertial confinement fusion scheme, shock ignition requires a strong converging shock driven by a high-intensity laser pulse to ignite a precompressed fusion capsule. Understanding nonlinear laser-plasma instabilities is crucial to assess and improve the laser-shock energy coupling. Recent experiments conducted on the OMEGA EP laser facility have demonstrated that such instabilities can ∼100% deplete the first 0.5 ns of the high-intensity laser. Analyses of the observed laser-generated blast wave suggest that this pump-depletion starts at ∼0.02 critical density and progresses to 0.1-0.2 critical density, which is also confirmed by the time-resolved stimulated Raman backscattering spectra. The pump-depletion dynamics can be explained by the breaking of ion-acoustic waves in stimulated Brillouin scattering. Such pump depletion would inhibit the collisional laser energy absorption but may benefit the generation of hot electrons with moderate temperatures for electron shock ignition [Phys. Rev. Lett. 119, 195001 (2017)PRLTAO0031-900710.1103/PhysRevLett.119.195001].