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Spectroscopic plasma tomography on field‐reversed configuration

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3 Author(s)
Sugimoto, S. ; Plasma Physics Laboratory, Faculty of Engineering, Osaka University, 2‐1 Yamada‐oka, Suita‐city, Osaka 565, Japan ; Niina, Torao ; Goto, Seiich

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A time‐resolved and two‐dimensional (2D) measurement system for high‐temperature plasma based on spectroscopy and computed tomography has been developed. The projections of plasma emission were collected using a ten‐channel fiber optic in the form of fan beam. A visible grating monochromator was employed as a narrow bandpass filter to extract a specific wavelength component from the collected light signals. The wavelength was tunable over visible and ultraviolet regions. The first result of an experiment to measure a 2D profile of a field‐reversed configuration plasma is presented. The measurement wavelength (497.6 nm) was appropriate to the detection of bremsstrahlung. The reconstruction results had a spacial resolution of 15×15 and a time resolution of up to 0.5 μs. Although a plasma rotation was assigned in this experiment, the result shows the potential of the developed system for plasma diagnostics.

Published in:

Journal of Applied Physics  (Volume:66 ,  Issue: 11 )