[Table of Contents]

Plasma and Fusion Research

Volume 3, S1013 (2008)

Regular Articles

Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device
Kenichi NAGAOKA, Masayuki YOKOYAMA, Yasuhiko TAKEIRI, Katsumi IDA, Mikiro YOSHINUMA, Seikichi MATSUOKA1), Hisamichi FUNABA, Shigeru MORITA, Takashi MUTOH, Tetsuo SEKI, Katsunori IKEDA, Masaki OSAKABE, Katsuyoshi TSUMORI, Yoshihide OKA, Osamu KANEKO and the LHD Experimental Group
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501, Japan
(Received 16 November 2007 / Accepted 15 February 2008 / Published 1 August 2008)

Abstract

A perpendicular neutral beam (P-NB) injector was installed in the Large Helical Device (LHD) and utilized for high-power ion heating and measurement of the ion temperature (Ti) profile by charge exchange spectroscopy. Significant progress was achieved in ion heating experiments using P-NB, and a high Ti of 5.2 keV was achieved at the plasma center. A Ti peak profile with a steep gradient in the core region was observed, indicating an improved mode of ion transport. The enhancement of toroidal flow in the core region was observed with the Ti rise. Transport analysis shows improvement in anomalous transport in the core region, and the neoclassical transport remains unchanged when the high Ti is realized.

Keywords

perpendicular NBI, ion heating, charge exchange spectroscopy, beam fueling, confinement improvement, toroidal rotation, ion thermal transport

DOI: 10.1585/pfr.3.S1013

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This paper may be cited as follows:

Kenichi NAGAOKA, Masayuki YOKOYAMA, Yasuhiko TAKEIRI, Katsumi IDA, Mikiro YOSHINUMA, Seikichi MATSUOKA, Hisamichi FUNABA, Shigeru MORITA, Takashi MUTOH, Tetsuo SEKI, Katsunori IKEDA, Masaki OSAKABE, Katsuyoshi TSUMORI, Yoshihide OKA, Osamu KANEKO and the LHD Experimental Group, Plasma Fusion Res. 3, S1013 (2008).