ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
One of the most critical quantities to be measured for better understanding of the ablative Rayleigh–Taylor (RT) instability is the cutoff wavelength below which the RT instability is stabilized. Unfortunately, this wavelength is expected to be below or close to spatial resolutions of most x-ray imagers used in the RT experiments. We propose and test a new technique using moiré interferometry to convert short wavelength perturbations to longer wavelength perturbations. The RT target is backlit by x rays and imaged just like in conventional experiments, but a grid mask is inserted between the target and the x-ray imager. The grid mask is one dimensional grid with a period slightly different from the wavelength of the RT target. It is set so that the grid and the RT perturbation groove are parallel to each other. With this operation, the long wavelength moiré interference is measured as the beat with the RT target. As an initial test, we use a grid mask with 10 μm period coupled to RT targets with 8 and 12 μm perturbation wavelengths. The corresponding moiré interference wavelengths are 40 and 60 μm, respectively.© 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1149434
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