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Onion-peeling inversion of stellarator images (2016)

K. C. Hammond, R. R. Diaz-Pacheco, Y. Kornbluth, F. A. Volpe and Y. Wei

American Institute of Physics (AIP)

In: Review of Scientific Instruments

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Publication Date: 2016-08-17

Description: An onion-peeling technique is developed for inferring the emissivity profile of a stellarator plasma from a two-dimensional image acquired through a CCD or CMOS camera. Each pixel in the image is treated as an integral of emission along a particular line-of-sight. Additionally, the flux surfaces in the plasma are partitioned into discrete layers, each of which is assumed to have uniform emissivity. If the topology of the flux surfaces is known, this construction permits the development of a system of linear equations that can be solved for the emissivity of each layer. We present initial results of this method applied to wide-angle visible images of the Columbia Neutral Torus (CNT) stellarator plasma.

Print ISSN: 0034-6748

Electronic ISSN: 1089-7623

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Published by American Institute of Physics (AIP)

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