A comparative study of x-ray emission from laser spots in laser-heated hohlraums relative to spots on simple disk targets

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872172· OSTI ID:467314

Ze, F; Langer, S H; Kauffman, R L; Kilkenny, J D; Landen, O; Ress, D; Rosen, M D; Suter, L J; Wallace, R J; Wiedwald, J D ^[1]

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1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)

In this paper we report the results of experiments that compare the x-ray emission from a laser spot in a radiation-filled hohlraum to that from a similar laser spot on a simple disk target. The studies were done using the Nova laser facility [J. D. Lindl, Phys. Plasmas {bold 2}, 3933 (1995)] in its 0.35 {mu}m wavelength, 1 ns square pulse configuration. Focal spot intensities were 2{endash}3.5{times}10{sup 15} W/cm{sup 2}. X-ray images measured x-ray conversion in a hohlraum and from an isolated disk simultaneously. A laser spot inside a hohlraum emitted more x rays, after subtracting the background emission from the hohlraum walls, than a spot on a disk. Numerical models suggest the enhanced spot emission inside the hohlraum is due to an increase in lateral transport relative to the disk. Filamentation in the hohlraum will also increase the spot size. The models agree fairly well with the results on spot spreading but do not explain the overall increase in conversion efficiency. {copyright} {ital 1997 American Institute of Physics.}

• Research Organization: Lawrence Livermore National Laboratory
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 467314
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
COMPARATIVE EVALUATIONS
EXPLOSIONS
INERTIAL CONFINEMENT
LASER TARGETS
LASER-PRODUCED PLASMA
LASER-RADIATION HEATING
NUMERICAL SOLUTION
PLASMA DIAGNOSTICS
PLASMA FILAMENT
X RADIATION