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Precision X-Ray Optical Depth Measurements in ICF Shells

S. A. Eddinger, R. B. Stephens, H. Huang, T. J. Drake, A. Nikroo, G. Flint, C. R. Bystedt

Fusion Science and Technology / Volume 51 / Number 4 / May 2007 / Pages 525-529

Technical Paper

We built a precision radiography system that measures shells for all current ablator materials to an accuracy of 1:104 in optical depth fluctuation and a spatial resolution of 120 m. The data obtained by the precision radiography system for undoped shells was compared with the data taken using the well-known surface measurement technique Spheremapper. Since both techniques yielded the same power spectrum for the same shell, the results of the precision radiography system were verified. When this technique is compared to the Be:Cu NIF shell, there is no significant internal layer fluctuation. To account for the growing measurement demand, a new x-ray system to accommodate measurements in 1 working day was designed.

 
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