TITLE

Penumbral imaging for measurement of the ablation density in laser-driven targets

AUTHOR(S)
Fujioka, Shinsuke; Shiraga, Hiroyuki; Nishikino, Masaharu; Heya, Manabu; Shigemori, Keisuke; Nakai, Mitsuo; Azechi, Hiroshi; Nakai, Sadao; Yamanaka, Tatsuhiko
PUB. DATE
July 2002
SOURCE
Review of Scientific Instruments;Jul2002, Vol. 73 Issue 7, p2588
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
One-dimensional (1D) penumbral imaging technique with high spatial resolution has been developed, and applied to density profile measurements in laser-driven Rayleigh-Taylor instability experiments at a GEKKO XII-HIPER laser system. A laser-irradiated planar target was observed with side-on x-ray backlighting. A penumbral image of an x-ray radiograph was made by using a knife-edge imager. The x-ray radiograph was, then, reconstructed by differentiating the penumbral image with a proper Wiener filtering. A density profile was deduced from the reconstructed x-ray radiograph. In a proof-of-principle experiment, the density profile of a polystyrene (PS) target before laser irradiation was measured by using this method, and high spatial resolution of 3-4 µm was demonstrated. A laser-irradiated PS target in the acceleration phase was observed. The experimentally observed density profile was found to be consistent with the prediction by a 1D hydrodynamic simulation code. The x-ray penumbral imaging is a very simple and useful technique with high spatial resolution for research in hydrodynamics relevant to inertial fusion energy.
ACCESSION #
6860947

 

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