Measurement of Ion Temperature during the Intermittent Negative Spike in Floating Potential

Yuto YAMADA; Atsushi OKAMOTO; Takaaki FUJITA; Yuichi KAWACHI; Minami SUGIMOTO; Koki SATO; Muneo KOIKE; Kota TAKEDA; Kazuhiro TORII; Shinji YOSHIMURA

doi:10.1585/pfr.20.1201027

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Measurement of Ion Temperature during the Intermittent Negative Spike in Floating Potential

Yuto YAMADA, Atsushi OKAMOTO, Takaaki FUJITA, Yuichi KAWACHI, Minami SUGIMOTO, Koki SATO, Muneo KOIKE, Kota TAKEDA, Kazuhiro TORII, Shinji YOSHIMURA

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

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2025 Volume 20 Article ID: 1201027

DOI https://doi.org/10.1585/pfr.20.1201027

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Abstract

The ion temperature in an ECR plasma is determined from the ratio of wavelength-integrated spectra obtained using a spectrometer with sufficient time resolution. The ion temperature during the intermittent negative spikes in floating potential is extracted using the conditional averaging method. For the first time, we have successfully observed a decrease in ion temperature during intermittent events.

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