First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves

Hiro Togashi; Akira Ejiri; Hiroto Homma; Takahiro Shinya; Yuichi Takase; Kazuya Toida; Naoto Tsujii; Takashi Yamaguchi; Yusuke Yoshida; Makoto Hasegawa; Yoshihiko Nagashima; Hirokazu Furui; Kenta Nakamura; Wataru Takahashi; Toshihiro Takeuchi; Masateru Sonehara; Satoru Yajima; Hibiki Yamazaki

doi:10.1585/pfr.10.1202082

First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves

Hiro Togashi, Akira Ejiri, Hiroto Homma, Takahiro Shinya, Yuichi Takase, Kazuya Toida, Naoto Tsujii, Takashi Yamaguchi, Yusuke Yoshida, Makoto Hasegawa, Yoshihiko Nagashima, Hirokazu Furui, Kenta Nakamura, Wataru Takahashi, Toshihiro Takeuchi, Masateru Sonehara, Satoru Yajima, Hibiki Yamazaki

Division of Nuclear Fusion Dynamics

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

8 Citations (Scopus)

Abstract

In this research, the profiles of electron temperature T_e and density n_e for a spherical tokamak with the plasma current sustained by lower hybrid waves alone have been measured for the first time using Thomson scattering diagnostics in the TST-2 spherical tokamak device. The T_e profile was hollow and the n_e profile was like bell-shaped. T_e and n_e near the plasma center were 6 eV and 6 × 1017 m^-3, respectively, leading to a pressure of 0.6 Pa. On the other hand, whole pressure at the plasma center calculated using an equilibrium reconstruction code EFIT was around 20 Pa. Therefore, it is suggested that fast electrons play an important role in the plasma equilibrium.

Original language	English
Article number	1202082
Journal	Plasma and Fusion Research
Volume	10
DOIs	https://doi.org/10.1585/pfr.10.1202082
Publication status	Published - 2015

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.10.1202082

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Togashi, H., Ejiri, A., Homma, H., Shinya, T., Takase, Y., Toida, K., Tsujii, N., Yamaguchi, T., Yoshida, Y., Hasegawa, M., Nagashima, Y., Furui, H., Nakamura, K., Takahashi, W., Takeuchi, T., Sonehara, M., Yajima, S., & Yamazaki, H. (2015). First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves. Plasma and Fusion Research, 10, Article 1202082. https://doi.org/10.1585/pfr.10.1202082

Togashi, H, Ejiri, A, Homma, H, Shinya, T, Takase, Y, Toida, K, Tsujii, N, Yamaguchi, T, Yoshida, Y, Hasegawa, M , Nagashima, Y, Furui, H, Nakamura, K, Takahashi, W, Takeuchi, T, Sonehara, M, Yajima, S & Yamazaki, H 2015, 'First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves', Plasma and Fusion Research, vol. 10, 1202082. https://doi.org/10.1585/pfr.10.1202082

@article{6181dbbc72d345dfb17a629cdd701330,

title = "First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves",

abstract = "In this research, the profiles of electron temperature Te and density ne for a spherical tokamak with the plasma current sustained by lower hybrid waves alone have been measured for the first time using Thomson scattering diagnostics in the TST-2 spherical tokamak device. The Te profile was hollow and the ne profile was like bell-shaped. Te and ne near the plasma center were 6 eV and 6 × 1017 m-3, respectively, leading to a pressure of 0.6 Pa. On the other hand, whole pressure at the plasma center calculated using an equilibrium reconstruction code EFIT was around 20 Pa. Therefore, it is suggested that fast electrons play an important role in the plasma equilibrium.",

author = "Hiro Togashi and Akira Ejiri and Hiroto Homma and Takahiro Shinya and Yuichi Takase and Kazuya Toida and Naoto Tsujii and Takashi Yamaguchi and Yusuke Yoshida and Makoto Hasegawa and Yoshihiko Nagashima and Hirokazu Furui and Kenta Nakamura and Wataru Takahashi and Toshihiro Takeuchi and Masateru Sonehara and Satoru Yajima and Hibiki Yamazaki",

note = "Funding Information: This work was supported by Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research No. 21226021 and by the National Institute for Fusion Science (NIFS) Collaborative Research Program Nos. NIFS14KOCR001 and NIFS12KUTR078. Publisher Copyright: {\textcopyright} 2015 The Japan Society of Plasma Science and Nuclear Fusion Research.",

year = "2015",

doi = "10.1585/pfr.10.1202082",

language = "English",

volume = "10",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

}

TY - JOUR

T1 - First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves

AU - Togashi, Hiro

AU - Ejiri, Akira

AU - Homma, Hiroto

AU - Shinya, Takahiro

AU - Takase, Yuichi

AU - Toida, Kazuya

AU - Tsujii, Naoto

AU - Yamaguchi, Takashi

AU - Yoshida, Yusuke

AU - Hasegawa, Makoto

AU - Nagashima, Yoshihiko

AU - Furui, Hirokazu

AU - Nakamura, Kenta

AU - Takahashi, Wataru

AU - Takeuchi, Toshihiro

AU - Sonehara, Masateru

AU - Yajima, Satoru

AU - Yamazaki, Hibiki

N1 - Funding Information: This work was supported by Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research No. 21226021 and by the National Institute for Fusion Science (NIFS) Collaborative Research Program Nos. NIFS14KOCR001 and NIFS12KUTR078. Publisher Copyright: © 2015 The Japan Society of Plasma Science and Nuclear Fusion Research.

PY - 2015

Y1 - 2015

N2 - In this research, the profiles of electron temperature Te and density ne for a spherical tokamak with the plasma current sustained by lower hybrid waves alone have been measured for the first time using Thomson scattering diagnostics in the TST-2 spherical tokamak device. The Te profile was hollow and the ne profile was like bell-shaped. Te and ne near the plasma center were 6 eV and 6 × 1017 m-3, respectively, leading to a pressure of 0.6 Pa. On the other hand, whole pressure at the plasma center calculated using an equilibrium reconstruction code EFIT was around 20 Pa. Therefore, it is suggested that fast electrons play an important role in the plasma equilibrium.

AB - In this research, the profiles of electron temperature Te and density ne for a spherical tokamak with the plasma current sustained by lower hybrid waves alone have been measured for the first time using Thomson scattering diagnostics in the TST-2 spherical tokamak device. The Te profile was hollow and the ne profile was like bell-shaped. Te and ne near the plasma center were 6 eV and 6 × 1017 m-3, respectively, leading to a pressure of 0.6 Pa. On the other hand, whole pressure at the plasma center calculated using an equilibrium reconstruction code EFIT was around 20 Pa. Therefore, it is suggested that fast electrons play an important role in the plasma equilibrium.

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DO - 10.1585/pfr.10.1202082

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VL - 10

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 1202082

ER -

First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves

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