Publication Date:
2016-08-06
Description:
The dilation x-ray imager (DIXI) [T. J. Hilsabeck et al. , Rev. Sci. Instrum. 81 , 10E317 (2010); S. R. Nagel et al. , ibid. 83 , 10E116 (2012); S. R. Nagel et al. , ibid. 85 , 11E504 (2014)] is a high-speed x-ray framing camera that uses the pulse-dilation technique to achieve a temporal resolution of less than 10 ps. This is a 10 × improvement over conventional framing cameras currently employed on the National Ignition Facility (NIF) (100 ps resolution), and otherwise only achievable with 1D streaked imaging. A side effect of the dramatically reduced gate width is the comparatively lower detected signal level. Therefore we implement a Poisson noise reduction with non-local principal component analysis method [J. Salmon et al. , J. Math. Imaging Vision 48 , 279294 (2014)] to improve the robustness of the DIXI data analysis. Here we present results on ignition-relevant experiments at the NIF using DIXI. In particular we focus on establishing that/when DIXI gives reliable shape metrics ( P 0 , P 2 , and P 4 Legendre modes, and their temporal evolution/swings).
Print ISSN:
0034-6748
Electronic ISSN:
1089-7623
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
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