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Optical Engineering

Application Of Computerized Tomography Techniques To Tokamak Diagnostics
Author(s): R. C. Chase; F. H. Seguin; M. Gerassimenko; R. Petrasso
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Paper Abstract

The methods of computerized tomography (CT), developed for medical x-ray applications, can be adapted for use in studying plasma x-ray emissivity distributions in tokamaks and other magnetic confinement devices. Current generation CT scanners reconstruct maps of x-ray absorptivity on body cross sections by processing transmission data from a number of fan-shaped beams of x rays. Analogous fan beam emission data can be obtained from confined plasmas by collimating emitted soft x rays with a "pin hole" or slit and detecting them with a linear array of solid-state detectors. Data from a number of such one-dimensional views of the plasma can be used to reconstruct a two-dimensional "photograph" of the absolute x-ray emission in cross section. No a priori assumptions about the nature of the emissivity distribution are necessary. In this paper we demonstrate the feasibility of the technique by reconstructing test patterns with data simulated for a number of different types of detector arrangements. We also use the technique with real data to reconstruct a rotating emissivity feature on a cross section of Massachusetts Institute of Technology's Alcator A tokamak.

Paper Details

Date Published: 1 June 1981
PDF: 7 pages
Opt. Eng. 20(3) 203486 doi: 10.1117/12.7972746
Published in: Optical Engineering Volume 20, Issue 3
Show Author Affiliations
R. C. Chase, American Science and Engineering, Inc. (United States)
F. H. Seguin, American Science and Enaineerina. Inc. (United States)
M. Gerassimenko, American Science and Enaineerina. Inc. (United States)
R. Petrasso, American Science and Enaineerina. Inc. (United States)

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