Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD

Takeshi Ido; Akihiro Shimizu; Masaki Nishiura; Haruhisa Nakano; Shinji Kato; Shinsuke Ohshima; Yasuo Yoshimura; Shin Kubo; Takashi Shimozuma; Hiroe Igami; Hiromi Takahashi; Kazuo Toi; Fumitake Watanabe; Kazumichi Narihara; Ichihiro Yamada

doi:10.1088/1009-0630/11/4/19

Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD

Takeshi Ido, Akihiro Shimizu, Masaki Nishiura, Haruhisa Nakano, Shinji Kato, Shinsuke Ohshima, Yasuo Yoshimura, Shin Kubo, Takashi Shimozuma, Hiroe Igami, Hiromi Takahashi, Kazuo Toi, Fumitake Watanabe, Kazumichi Narihara, Ichihiro Yamada

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10 Citations (Scopus)

Abstract

A heavy ion beam probe (HIBP) using a 3-MV tandem accelerator has been installed on large helical device (LHD). Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion-root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive (ECCD). Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfvén eigenmode (RSAE), whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode (GAM) frequency.

Original language	English
Pages (from-to)	460-464
Number of pages	5
Journal	Plasma Science and Technology
Volume	11
Issue number	4
DOIs	https://doi.org/10.1088/1009-0630/11/4/19
Publication status	Published - Nov 17 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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Ido, T., Shimizu, A., Nishiura, M., Nakano, H., Kato, S., Ohshima, S., Yoshimura, Y., Kubo, S., Shimozuma, T., Igami, H., Takahashi, H., Toi, K., Watanabe, F., Narihara, K., & Yamada, I. (2009). Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD. Plasma Science and Technology, 11(4), 460-464. https://doi.org/10.1088/1009-0630/11/4/19

Ido, T , Shimizu, A, Nishiura, M, Nakano, H, Kato, S, Ohshima, S, Yoshimura, Y, Kubo, S, Shimozuma, T, Igami, H, Takahashi, H, Toi, K, Watanabe, F, Narihara, K & Yamada, I 2009, 'Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD', Plasma Science and Technology, vol. 11, no. 4, pp. 460-464. https://doi.org/10.1088/1009-0630/11/4/19

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abstract = "A heavy ion beam probe (HIBP) using a 3-MV tandem accelerator has been installed on large helical device (LHD). Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion-root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive (ECCD). Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfv{\'e}n eigenmode (RSAE), whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode (GAM) frequency.",

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T1 - Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD

AU - Ido, Takeshi

AU - Shimizu, Akihiro

AU - Nishiura, Masaki

AU - Nakano, Haruhisa

AU - Kato, Shinji

AU - Ohshima, Shinsuke

AU - Yoshimura, Yasuo

AU - Kubo, Shin

AU - Shimozuma, Takashi

AU - Igami, Hiroe

AU - Takahashi, Hiromi

AU - Toi, Kazuo

AU - Watanabe, Fumitake

AU - Narihara, Kazumichi

AU - Yamada, Ichihiro

PY - 2009/11/17

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AB - A heavy ion beam probe (HIBP) using a 3-MV tandem accelerator has been installed on large helical device (LHD). Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion-root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive (ECCD). Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfvén eigenmode (RSAE), whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode (GAM) frequency.

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JO - Plasma Science and Technology

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ER -

Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD

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