Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak

Masaki Ishiguro, Kazuaki Hanada, Haiqing Liu, Hideki Zushi, Naoaki Yoshida, Tomonori Tokunaga, Kazuo Nakamura, Akihide Fujisawa, Hiroshi Idei, Mizuki Sakamoto, Makoto Hasegawa, Saya Tashima, Yuichi Takase, Takashi Maekawa, Yasuaki Kishimoto, Osamu Mitarai, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

In magnetized plasmas, the presence of a significant number of energetic electrons has been observed but quantitative characteristics of these electrons are proving difficult to investigate. A Langmuir probe offers a means to provide quantitative measurement of these energetic electrons that takes into account electron emissions (secondary electron emission and electron reflection) from the probe tips and sheath expansion around the probe tips caused by a considerable negative potential. In this paper, these effects are experimentally confirmed and an analytical means to measure energetic electron characteristics are proposed. An analysis of plasmas produced by a high frequency wave is then applied leading to the successful detection of an asymmetric flow of energetic electrons. The estimated electron temperature and current density were approximately 4-5 keV and 2-3 kAm2.

Original languageEnglish
Article number113509
JournalReview of Scientific Instruments
Volume82
Issue number11
DOIs
Publication statusPublished - Nov 2011

All Science Journal Classification (ASJC) codes

  • Instrumentation

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