Plasma and Fusion Research
Volume 3, S1013 (2008)
Regular Articles
- National Institute for Fusion Science, Toki 509-5292, Japan
- 1)
- Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501, Japan
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
Full Text
References
- [1] S. Ishida et al., 16th IAEA Fusion Energy Conference, Montreal, CN-64/A3-1, 1996.
- [2] R. J. Fonck et al., Phys. Rev. Lett. 63, 520 (1989).
- [3] JET Team, Plasma Phys. Control. Fusion 37, A359 (1995).
- [4] K. Ida et al., Phys. Rev. Lett. 76, 1268 (1996).
- [5] K. Ida et al., Nucl. Fusion 39, 1649 (1999).
- [6] T. Minami et al., Nucl. Fusion 44, 342 (2004).
- [7] Y. Takeiri et al., Nucl. Fusion 47, 1078 (2007).
- [8] O. Kaneko et al., Nucl. Fusion 43, 692 (2003).
- [9] T.H. Stix, Plasma Phys. 14, 367 (1972).
- [10] S. Morita et al., 19th IAEA Fusion Energy Conference, Lyon, 2002, EX/P2-18.
- [11] M. Osakabe et al., Proceedings of 17th International Toki Conference on Plasma Flows and Turbulence in Plasmas and 16th International Stellarator/Heliotron Workshop 2007, Toki, P2-079, 2007.
- [12] M. Yoshinuma et al., Plasma Fusion Res. 3, S1014 (2008).
- [13] S. Murakami et al., Fusion Sci. Technol. 46, 241 (2004).
- [14] A. Iiyoshi et al., Nucl. Fusion 39, 1245 (1999).
- [15] C.D. Beidler and W.D.D' Haeseleer, Plasma Phys. Control. Fusion 37, 463 (1995).
- [16] S. Matsuoka et al., Plasma Fusion Res. 3, S1056 (2008).
- [17] K. Ida, et al., Nucl. Fusion 45, 391 (2005).
- [18] M. Yokoyama et al., Nucl. Fusion 47, 1213 (2007).
- [19] Y. Koide et al., Plasma Phys. Control. Fusion 38, 1011 (1996).
- [20] M. Yoshinuma, Stellarator News, p.6 Oct. 2007.
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).