Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac

Toshihiro Oku; Sumio Kitajima; Keiichi Ishii; Yu Sato; Jo Tachibana; Satoshi Koike; Kosuke Shimizu; Atsushi Okamoto; Hiromi Takahashi; Masakazu Takayama; Shigeru Inagaki

doi:10.1585/pfr.9.3402051

Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac

Toshihiro Oku, Sumio Kitajima, Keiichi Ishii, Yu Sato, Jo Tachibana, Satoshi Koike, Kosuke Shimizu, Atsushi Okamoto, Hiromi Takahashi, Masakazu Takayama, Shigeru Inagaki

ENG - Quantum Science and Energy Engineering

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

1 Citation (Scopus)

Abstract

Electrode biasing experiments were carried out in the Tohoku University Heliac (TU-Heliac) to investigate the role of ion viscosity maxima in the L-H transition. To investigate the relation between ion viscosity and poloidal Mach number, the driving force of the poloidal rotation and poloidal rotation velocity must be normalized by the ion temperature Ti and ion pressure P_i. Doppler spectroscopy was used to directly measure the ion temperature and the poloidal rotation velocity. Therefore, the dependence of the ion temperature and poloidal rotation velocity on the electrode current was obtained. The relation between the normalized driving force of the poloidal rotation and the poloidal Mach number M_p was non-linear. Bifurcation phenomena in the poloidal rotation appeared at M_p ~ -3. These results qualitatively agreed with the neoclassical theory.

Original language	English
Article number	3402051
Journal	Plasma and Fusion Research
Volume	9
Issue number	SpecialIssue2
DOIs	https://doi.org/10.1585/pfr.9.3402051
Publication status	Published - 2014

Keywords

Bifurcation
Electrode biasing
Heliac
Ion viscosity
L-H transition
Plasma
Poloidal rotation

ASJC Scopus subject areas

Condensed Matter Physics

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10.1585/pfr.9.3402051

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Oku, T., Kitajima, S., Ishii, K., Sato, Y., Tachibana, J., Koike, S., Shimizu, K., Okamoto, A., Takahashi, H., Takayama, M., & Inagaki, S. (2014). Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac. Plasma and Fusion Research, 9(SpecialIssue2), [3402051]. https://doi.org/10.1585/pfr.9.3402051

Oku, T, Kitajima, S, Ishii, K, Sato, Y, Tachibana, J, Koike, S, Shimizu, K, Okamoto, A, Takahashi, H, Takayama, M & Inagaki, S 2014, 'Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac', Plasma and Fusion Research, vol. 9, no. SpecialIssue2, 3402051. https://doi.org/10.1585/pfr.9.3402051

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title = "Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac",

abstract = "Electrode biasing experiments were carried out in the Tohoku University Heliac (TU-Heliac) to investigate the role of ion viscosity maxima in the L-H transition. To investigate the relation between ion viscosity and poloidal Mach number, the driving force of the poloidal rotation and poloidal rotation velocity must be normalized by the ion temperature Ti and ion pressure Pi. Doppler spectroscopy was used to directly measure the ion temperature and the poloidal rotation velocity. Therefore, the dependence of the ion temperature and poloidal rotation velocity on the electrode current was obtained. The relation between the normalized driving force of the poloidal rotation and the poloidal Mach number Mp was non-linear. Bifurcation phenomena in the poloidal rotation appeared at Mp ~ -3. These results qualitatively agreed with the neoclassical theory.",

keywords = "Bifurcation, Electrode biasing, Heliac, Ion viscosity, L-H transition, Plasma, Poloidal rotation",

author = "Toshihiro Oku and Sumio Kitajima and Keiichi Ishii and Yu Sato and Jo Tachibana and Satoshi Koike and Kosuke Shimizu and Atsushi Okamoto and Hiromi Takahashi and Masakazu Takayama and Shigeru Inagaki",

note = "Publisher Copyright: {\textcopyright} 2014 The Japan Society of Plasma Science and Nuclear Fusion Research.",

year = "2014",

doi = "10.1585/pfr.9.3402051",

language = "English",

volume = "9",

journal = "Plasma and Fusion Research",

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TY - JOUR

T1 - Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac

AU - Oku, Toshihiro

AU - Kitajima, Sumio

AU - Ishii, Keiichi

AU - Sato, Yu

AU - Tachibana, Jo

AU - Koike, Satoshi

AU - Shimizu, Kosuke

AU - Okamoto, Atsushi

AU - Takahashi, Hiromi

AU - Takayama, Masakazu

AU - Inagaki, Shigeru

PY - 2014

Y1 - 2014

N2 - Electrode biasing experiments were carried out in the Tohoku University Heliac (TU-Heliac) to investigate the role of ion viscosity maxima in the L-H transition. To investigate the relation between ion viscosity and poloidal Mach number, the driving force of the poloidal rotation and poloidal rotation velocity must be normalized by the ion temperature Ti and ion pressure Pi. Doppler spectroscopy was used to directly measure the ion temperature and the poloidal rotation velocity. Therefore, the dependence of the ion temperature and poloidal rotation velocity on the electrode current was obtained. The relation between the normalized driving force of the poloidal rotation and the poloidal Mach number Mp was non-linear. Bifurcation phenomena in the poloidal rotation appeared at Mp ~ -3. These results qualitatively agreed with the neoclassical theory.

AB - Electrode biasing experiments were carried out in the Tohoku University Heliac (TU-Heliac) to investigate the role of ion viscosity maxima in the L-H transition. To investigate the relation between ion viscosity and poloidal Mach number, the driving force of the poloidal rotation and poloidal rotation velocity must be normalized by the ion temperature Ti and ion pressure Pi. Doppler spectroscopy was used to directly measure the ion temperature and the poloidal rotation velocity. Therefore, the dependence of the ion temperature and poloidal rotation velocity on the electrode current was obtained. The relation between the normalized driving force of the poloidal rotation and the poloidal Mach number Mp was non-linear. Bifurcation phenomena in the poloidal rotation appeared at Mp ~ -3. These results qualitatively agreed with the neoclassical theory.

KW - Bifurcation

KW - Electrode biasing

KW - Heliac

KW - Ion viscosity

KW - L-H transition

KW - Plasma

KW - Poloidal rotation

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DO - 10.1585/pfr.9.3402051

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SN - 1880-6821

VL - 9

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

IS - SpecialIssue2

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ER -

Direct measurement of ion temperature and poloidal rotation velocity with Doppler spectroscopy during Bifurcation in Tohoku University Heliac

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