Development of a tunable Fabry-Perot etalon-based near-infrared interference spectrometer for measurement of the HeI 2{sup 3}S-2{sup 3}P spectral line shape in magnetically confined torus plasmas

In magnetically confined torus plasmas, the local emission intensity, temperature, and flow velocity of atoms in the inboard and outboard scrape-off layers can be separately measured by a passive emission spectroscopy assisted by observation of the Zeeman splitting in their spectral line shape. To u...

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Bibliographic Details
Published in:Review of scientific instruments 2015-10, Vol.86 (10)
Main Authors: Ogane, S., Shikama, T., Hasuo, M., Zushi, H.
Format: Article
Language:English
Subjects:
EMISSION SPECTROSCOPY
HELIUM 2
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
PLASMA
PLASMA SCRAPE-OFF LAYER
SHAPE
SPECTROMETERS
SUPERCONDUCTING MAGNETS
TOKAMAK DEVICES
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Summary:In magnetically confined torus plasmas, the local emission intensity, temperature, and flow velocity of atoms in the inboard and outboard scrape-off layers can be separately measured by a passive emission spectroscopy assisted by observation of the Zeeman splitting in their spectral line shape. To utilize this technique, a near-infrared interference spectrometer optimized for the observation of the helium 2{sup 3}S–2{sup 3}P transition spectral line (wavelength 1083 nm) has been developed. The applicability of the technique to actual torus devices is elucidated by calculating the spectral line shapes expected to be observed in LHD and QUEST (Q-shu University Experiment with Steady State Spherical Tokamak). In addition, the Zeeman effect on the spectral line shape is measured using a glow-discharge tube installed in a superconducting magnet.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4931804