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

doi:10.1063/1.3662204

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

6 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 language	English
Article number	113509
Journal	Review of Scientific Instruments
Volume	82
Issue number	11
DOIs	https://doi.org/10.1063/1.3662204
Publication status	Published - Nov 2011

All Science Journal Classification (ASJC) codes

Instrumentation

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Ishiguro, M., Hanada, K., Liu, H., Zushi, H., Yoshida, N., Tokunaga, T., Nakamura, K., Fujisawa, A., Idei, H., Sakamoto, M., Hasegawa, M., Tashima, S., Takase, Y., Maekawa, T., Kishimoto, Y., Mitarai, O., Kawasaki, S., Nakashima, H., & Higashijima, A. (2011). Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak. Review of Scientific Instruments, 82(11), Article 113509. https://doi.org/10.1063/1.3662204

Ishiguro, M, Hanada, K, Liu, H, Zushi, H, Yoshida, N, Tokunaga, T, Nakamura, K, Fujisawa, A , Idei, H, Sakamoto, M, Hasegawa, M, Tashima, S, Takase, Y, Maekawa, T, Kishimoto, Y, Mitarai, O, Kawasaki, S, Nakashima, H & Higashijima, A 2011, 'Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak', Review of Scientific Instruments, vol. 82, no. 11, 113509. https://doi.org/10.1063/1.3662204

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

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.",

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

note = "Funding Information: The authors would like to acknowledge Dr. Noriyasu Ohno, Dr. Shuichi Takamura, and Dr. Tetsuo Tanabe for helpful suggestions to this work. This work was supported by Grant-in-Aid for JSPS Fellows (KAKENHI) 23/3093. This work was performed with the support and under the auspices of the NIFS Collaboration Research Program (NIFS05KUTRO14, NIFS08KUTRO022).",

year = "2011",

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doi = "10.1063/1.3662204",

language = "English",

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journal = "Review of Scientific Instruments",

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AU - Ishiguro, Masaki

AU - Hanada, Kazuaki

AU - Liu, Haiqing

AU - Zushi, Hideki

AU - Yoshida, Naoaki

AU - Tokunaga, Tomonori

AU - Nakamura, Kazuo

AU - Fujisawa, Akihide

AU - Idei, Hiroshi

AU - Sakamoto, Mizuki

AU - Hasegawa, Makoto

AU - Tashima, Saya

AU - Takase, Yuichi

AU - Maekawa, Takashi

AU - Kishimoto, Yasuaki

AU - Mitarai, Osamu

AU - Kawasaki, Shoji

AU - Nakashima, Hisatoshi

AU - Higashijima, Aki

N1 - Funding Information: The authors would like to acknowledge Dr. Noriyasu Ohno, Dr. Shuichi Takamura, and Dr. Tetsuo Tanabe for helpful suggestions to this work. This work was supported by Grant-in-Aid for JSPS Fellows (KAKENHI) 23/3093. This work was performed with the support and under the auspices of the NIFS Collaboration Research Program (NIFS05KUTRO14, NIFS08KUTRO022).

PY - 2011/11

Y1 - 2011/11

N2 - 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.

AB - 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.

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

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