Variation of Doppler Broadening in High-Temperature Bubbles Created in an ECR Plasma

Atsushi OKAMOTO; Shinji YOSHIMURA; Kenichiro TERASAKA; Masayoshi Y. TANAKA

doi:10.1585/pfr.14.1201165

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Variation of Doppler Broadening in High-Temperature Bubbles Created in an ECR Plasma

Atsushi OKAMOTO, Shinji YOSHIMURA, Kenichiro TERASAKA, Masayoshi Y. TANAKA

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Keywords: ion temperature, high-temperature bubble, electron cyclotron resonance plasma, Doppler spectroscopy, conditional average

JOURNAL FREE ACCESS

2019 Volume 14 Pages 1201165

DOI https://doi.org/10.1585/pfr.14.1201165

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Abstract

A high dispersion and high time-resolution spectrometer equipped with two slits in output ports is developed to observe variation of Doppler broadening in the high-temperature bubbles [K. Terasaka, et. al., Phys. Plasmas 25, 052113 (2018)]. Reduction of Doppler broadening in a line spectrum of helium ion is experimentally observed when the bubbles emerge in the viewing chord of spectrometer. The results suggest possibilities of ion temperature reduction during the high-temperature bubbles.

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