Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion.

Autor:	Christopherson AR; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, 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 14623-1299, USA.; Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.; Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA., Forrest CJ; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Howard J; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.; Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA., Theobald W; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Delettrez JA; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Rosenberg MJ; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Solodov AA; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Stoeckl C; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Patel D; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.; Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA., Gopalaswamy V; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.; Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA., Cao D; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Peebles JL; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Edgell DH; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Seka W; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Epstein R; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Wei MS; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Gatu Johnson M; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA., Simpson R; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA., Regan SP; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA., Campbell EM; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2021 Jul 30; Vol. 127 (5), pp. 055001.
DOI:	10.1103/PhysRevLett.127.055001
Abstrakt:	Hot electrons generated by laser-plasma instabilities degrade the performance of laser-fusion implosions by preheating the DT fuel and reducing core compression. The hot-electron energy deposition in the DT fuel has been directly measured for the first time by comparing the hard x-ray signals between DT-layered and mass-equivalent ablator-only implosions. The electron energy deposition profile in the fuel is inferred through dedicated experiments using Cu-doped payloads of varying thickness. The measured preheat energy accurately explains the areal-density degradation observed in many OMEGA implosions. This technique can be used to assess the viability of the direct-drive approach to laser fusion with respect to the scaling of hot-electron preheat with laser energy.
Databáze:	MEDLINE
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