Role of Hot-Electron Preheating in the Compression of Direct-Drive Imploding Targets with Cryogenic D{sub 2} Ablators

Journal Article · Fri May 09 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.185005· OSTI ID:21128132

Smalyuk, V A; Shvarts, D; Betti, R; Delettrez, J A; Edgell, D H; Glebov, V Yu; Goncharov, V N; McCrory, R L; Meyerhofer, D D; Radha, P B; Regan, S P; Sangster, T C; Seka, W; Skupsky, S; Stoeckl, C; Yaakobi, B; Frenje, J A; Li, C K; Petrasso, R D; Seguin, F H ^[1]

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1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299 (United States)

The compression of direct-drive, spherical implosions is studied using cryogenic D{sub 2} targets on the 60-beam, 351-nm OMEGA laser with intensities ranging from {approx}3x10{sup 14} to {approx}1x10{sup 15} W/cm{sup 2}. The hard-x-ray signal from hot electrons generated by laser-plasma instabilities increases with laser intensity, while the areal density decreases. Mitigating hot-electron production, by reducing the laser intensity to {approx}3x10{sup 14} W/cm{sup 2}, results in areal density of the order of {approx}140 mg/cm{sup 2}, in good agreement with 1D simulations. These results will be considered in future direct-drive-ignition designs.

• OSTI ID: 21128132
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPRESSION
ELECTRONS
HARD X RADIATION
HEAT TREATMENTS
IMPLOSIONS
LASERS
PLASMA INSTABILITY
SIGNALS
SIMULATION
SPHERICAL CONFIGURATION
THERMONUCLEAR IGNITION