12 August 1986 Soft X-ray Imaging System for Measurement of Noncircular Tokamak Plasmas
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A soft X-ray camera and image processing system has been constructed to provide measurements of the internal shape of high temperature tokamak plasmas. The camera consists of a metallic-foil-filtered pinhole aperture and a microchannel plate image intensifier/convertor which produces a visible image for detection by a CCD TV camera. A wide-angle tangential view of the toroidal plasma allows a single compact camera to view the entire plasma cross section. With Be filters 12 to 100 m thick, the signal from the microchannel plate is produced mostly by nickel L-line emissions which originate in the hot plasma core. The measured toroidal image is numerically inverted to produce a cross-sectional soft X-ray image of the plasma. Since the internal magnetic flux surfaces are usually isothermal and the nickel emissivity depends strongly on the local electron temperature, the X-ray emission contours reflect the shape of the magnetic surfaces in the plasma interior. Initial results from the PBX tokamak experiment show clear differences in internal plasma shapes for circular and bean-shaped discharges.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. J. Fonck, R. J. Fonck, M. Reusch, M. Reusch, K. P. Jaehnig, K. P. Jaehnig, R. Hulse, R. Hulse, P. Roney, P. Roney, } "Soft X-ray Imaging System for Measurement of Noncircular Tokamak Plasmas", Proc. SPIE 0691, X-Ray Imaging II, (12 August 1986); doi: 10.1117/12.936629; https://doi.org/10.1117/12.936629

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