Measurements of the effects of the intensity pickets on laser imprinting for direct-drive, adiabat-shaping designs on OMEGA
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623 (United States)
Effects of the intensity pickets on laser imprinting were investigated using laser-driven, planar plastic and foam targets on the OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Intensity pickets are used in adiabat-shaping techniques designed to improve stability of inertial confinement fusion targets. The measurements were performed in planar foam targets using the decaying shock method of adiabat shaping and in planar plastic targets using the relaxation (RX) method. In foam targets, the picket reduced the target areal-density modulations by {approx}6 times at shorter spatial wavelengths of 30 and 60 {mu}m, while at a longer wavelength of 120 {mu}m there was no reduction. The ''imprint efficiency,'' the equivalent surface amplitude produced by imprinting, was reduced by the intensity picket by a factor of {approx}3 at a spatial wavelength of 60 {mu}m, while it was increased by a factor of {approx}2 at a 120-{mu}m spatial wavelength. In plastic targets, used to test the RX method, the imprint efficiency was reduced by the intensity picket by a factor of {approx}2 at spatial wavelengths of 30 and 60 {mu}m, while it was about the same at a 120-{mu}m spatial wavelength.
- OSTI ID:
- 20974883
- Journal Information:
- Physics of Plasmas, Vol. 14, Issue 3; Other Information: DOI: 10.1063/1.2715550; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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