Optimum hot electron production with low-density foams for laser fusion by fast ignition

We propose a foam cone-in-shell target design aiming at optimum hot electron production for the fast ignition. A thin low-density foam is proposed to cover the inner tip of a gold cone inserted in a fuel shell. An intense laser is then focused on the foam to generate hot electrons for the fast ignit...

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Bibliographic Details
Published in:Physical review letters 2006-06, Vol.96 (25), p.255006-255006, Article 255006
Main Authors: Lei, A L, Tanaka, K A, Kodama, R, Kumar, G R, Nagai, K, Norimatsu, T, Yabuuchi, T, Mima, K
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONES
ELECTRON TEMPERATURE
ELECTRONS
FOAMS
GOLD
LASERS
PLASMA
THERMONUCLEAR IGNITION
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Summary:We propose a foam cone-in-shell target design aiming at optimum hot electron production for the fast ignition. A thin low-density foam is proposed to cover the inner tip of a gold cone inserted in a fuel shell. An intense laser is then focused on the foam to generate hot electrons for the fast ignition. Element experiments demonstrate increased laser energy coupling efficiency into hot electrons without increasing the electron temperature and beam divergence with foam coated targets in comparison with solid targets. This may enhance the laser energy deposition in the compressed fuel plasma.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.96.255006