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Numerical Analysis of ICRF Minority Heating in Helitoron J

Hiroyuki OKADA, Kota NOMURA¹⁾, Hiroto WATADA¹⁾, Shinji KOBAYASHI, Hyunyong LEE¹⁾, Tohru MIZUUCHI, Kazunobu NAGASAKI, Takashi MINAMI, Satoshi YAMAMOTO, Shinsuke OHSHIMA²⁾, Masaki TAKEUCHI, Shigeru KONOSHIMA, Takashi MUTOH³⁾, Kiyofumi MUKAI¹⁾, Kento YAMAMOTO¹⁾, Masashige SUWA¹⁾, Hiroaki YASHIRO¹⁾, Hayao YOSHINO¹⁾, Yuji NAKAMURA¹⁾, Kiyoshi HANATANI and Fumimichi SANO

Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan

1)

Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan

2)

Kyoto University Pioneering Research Unit for Next Generation, Gokasho, Uji 611-0011, Japan

3)

National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan

(Received 22 December 2010 / Accepted 21 April 2011 / Published 1 July 2011)

Abstract

The effect of the magnetic configuration on fast-ion confinement is one of the most important topics for helical devices. Fast-ion velocity distributions have been investigated using ion cyclotron range of frequencies (ICRF) minority heating in Heliotron J with special emphasis on the effect of the toroidal ripple (bumpiness) of the magnetic field strength. In measurements of the fast-ion tail generated by ICRF minority heating, a high bumpiness configuration is found to be preferable for tail formation. However, the measurement area based on the line of sight of the fast-ion detector was restricted in this experiment. Due to the complexity of the magnetic field in Heliotron J, three-dimensional analysis is required to interpret the experimental results. Monte-Carlo simulations were performed. The calculation results agree well with the experimental results for high-energy tail formation. The effective temperature of minority protons was estimated.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

fast ion confinement, magnetic configuration, ICRF, minority heating, Monte-Carlo simulation

DOI: 10.1585/pfr.6.2402063

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References

• [1] F. Sano et al., J. Plasma Fusion Res. SERIES 3, 26 (2000).
• [2] T. Obiki et al., Nucl. Fusion 41, 833 (2001).
• [3] M. Wakatani et al., Nucl. Fusion 40, 569 (2000).
• [4] S. Kobayashi et al., IAEA-CN-116/EX/P4-41 (2004).
• [5] H. Okada et al., Fusion Sci. Technol. 50, 287 (2006).
• [6] H. Okada et al., Nucl. Fusion 47, 1346 (2007).
• [7] H. Okada et al., Proc. 22nd IAEA Fusion Energy Conference, EX/P6-28 (2008).
• [8] A.H. Boozer and G. Kuo-Petravic, Phys. Fluids 24, 851 (1981).
• [9] H. Okada et al., Nucl. Fusion 36, 465 (1996).

This paper may be cited as follows:

Hiroyuki OKADA, Kota NOMURA, Hiroto WATADA, Shinji KOBAYASHI, Hyunyong LEE, Tohru MIZUUCHI, Kazunobu NAGASAKI, Takashi MINAMI, Satoshi YAMAMOTO, Shinsuke OHSHIMA, Masaki TAKEUCHI, Shigeru KONOSHIMA, Takashi MUTOH, Kiyofumi MUKAI, Kento YAMAMOTO, Masashige SUWA, Hiroaki YASHIRO, Hayao YOSHINO, Yuji NAKAMURA, Kiyoshi HANATANI and Fumimichi SANO, Plasma Fusion Res. 6, 2402063 (2011).