Measurements of laser-plasma instability relevant to ignition hohlraums

Autor:	D. F. DuBois, B. J. MacGowan, Mark D. Wilke, D. S. Montgomery, Bernhard H. Wilde, R. K. Kirkwood, Harvey A. Rose, George A. Kyrala, B. H. Failor, B. S. Bauer, Robert G. Watt, H. X. Vu, W. M. Wood, James A. Cobble, Juan C. Fernandez
Rok vydání:	1997
Předmět:	Physics business.industry Physics::Optics Plasma Condensed Matter Physics Laser Instability law.invention Optics Convective instability Physics::Plasma Physics Hohlraum Brillouin scattering law Plasma diagnostics business Inertial confinement fusion
Zdroj:	Physics of Plasmas. 4:1849-1856
ISSN:	1089-7674 1070-664X
DOI:	10.1063/1.872328
Popis:	The potential for laser-plasma instability is a serious concern for indirect-drive inertial confinement fusion (ICF), where laser beams illuminate the interior of a cavity (called a hohlraum) to produce x-rays for imploding a fusion capsule symmetrically. The speckled nature of laser beams used in ICF is an important factor in laser-plasma instability processes. For example, models which calculate the spatial growth of convective instability by properly accounting for the laser speckles successfully predict the observed onsets of backscattering due to stimulated Brillouin and Raman scattering instabilities (SBS and SRS). Assuming pump depletion as the only saturation mechanism in these models results in very large predicted levels of SBS and SRS backscattering from the long-scale plasmas expected in ignition hohlraums. However, in the long-scale plasmas studied in the Nova and Trident lasers [E. M. Campbell, Rev. Sci. Instrum. 57, 2101 (1986) and N. K. Moncur et al., Appl. Opt. 34, 4274 (1995)], SRS and S...
Databáze:	OpenAIRE
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