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

Autor:	W. Theobald, E. M. Campbell, J. A. Delettrez, Riccardo Betti, D. Patel, M. Gatu Johnson, Susan Regan, Michael Rosenberg, D. Cao, Raspberry Simpson, A. A. Solodov, V. Gopalaswamy, J. Howard, A. R. Christopherson, Chad Forrest, Ronald M. Epstein, D. H. Edgell, Mingsheng Wei, Jonathan Peebles, W. Seka, Christian Stoeckl
Rok vydání:	2021
Předmět:	Core (optical fiber) Materials science law Nuclear engineering General Physics and Astronomy Deposition (phase transition) Laser Inertial confinement fusion Scaling Hot electron Varying thickness Energy (signal processing) law.invention
Zdroj:	Physical Review Letters. 127
ISSN:	1079-7114 0031-9007
Popis:	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:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bf3dba173d4637544f99abab8f23c9e https://doi.org/10.1103/physrevlett.127.055001 Zobrazit plný text záznamu