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 journalArticle

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 1 2011

Fingerprint

Electrons
Electron emission
electrons
Experiments
electron emission
Electron reflection
Plasmas
Plant expansion
Langmuir probes
Electron temperature
probes
secondary emission
electrostatic probes
sheaths
Current density
electron energy
current density
expansion

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak. / Ishiguro, Masaki; Hanada, Kazuaki; Liu, Haiqing; Zushi, Hideki; Yoshida, Naoaki; Tokunaga, Tomonori; Nakamura, Kazuo; Fujisawa, Akihide; Idei, Hiroshi; Sakamoto, Mizuki; Hasegawa, Makoto; Tashima, Saya; Takase, Yuichi; Maekawa, Takashi; Kishimoto, Yasuaki; Mitarai, Osamu; Kawasaki, Shoji; Nakashima, Hisatoshi; Higashijima, Aki.

In: Review of Scientific Instruments, Vol. 82, No. 11, 113509, 01.11.2011.

Research output: Contribution to journalArticle

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
Ishiguro, Masaki ; Hanada, Kazuaki ; Liu, Haiqing ; Zushi, Hideki ; Yoshida, Naoaki ; Tokunaga, Tomonori ; Nakamura, Kazuo ; Fujisawa, Akihide ; Idei, Hiroshi ; Sakamoto, Mizuki ; Hasegawa, Makoto ; Tashima, Saya ; Takase, Yuichi ; Maekawa, Takashi ; Kishimoto, Yasuaki ; Mitarai, Osamu ; Kawasaki, Shoji ; Nakashima, Hisatoshi ; Higashijima, Aki. / Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak. In: Review of Scientific Instruments. 2011 ; Vol. 82, No. 11.
@article{259896ed6a4e4fb6aa8a8e6be8363007,
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",
year = "2011",
month = "11",
day = "1",
doi = "10.1063/1.3662204",
language = "English",
volume = "82",
journal = "Review of Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics Publising LLC",
number = "11",

}

TY - JOUR

T1 - Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak

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

PY - 2011/11/1

Y1 - 2011/11/1

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.

UR - http://www.scopus.com/inward/record.url?scp=82555173685&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=82555173685&partnerID=8YFLogxK

U2 - 10.1063/1.3662204

DO - 10.1063/1.3662204

M3 - Article

C2 - 22128977

AN - SCOPUS:82555173685

VL - 82

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

SN - 0034-6748

IS - 11

M1 - 113509

ER -