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

Yuto YAMADA¹⁾, Atsushi OKAMOTO¹⁾, Takaaki FUJITA¹⁾, Yuichi KAWACHI¹⁾, Minami SUGIMOTO¹⁾, Koki SATO¹⁾, Muneo KOIKE¹⁾, Kota TAKEDA¹⁾, Kazuhiro TORII¹⁾, Shinji YOSHIMURA²⁾

1)

Nagoya University, Nagoya 464-8603, Japan

2)

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 31 January 2025 / Accepted 2 March 2025 / Published 13 May 2025)

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.

Copyright (c) 2025 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

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

DOI: 10.1585/pfr.20.1201027

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References

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