[Table of Contents]

Plasma and Fusion Research

Volume 6, 2402063 (2011)

Regular Articles

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
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
Kyoto University Pioneering Research Unit for Next Generation, Gokasho, Uji 611-0011, Japan
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)


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.


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

DOI: 10.1585/pfr.6.2402063


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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).