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Study of High Power ICRF Antenna Design in LHD

Plasma Science and Technology 2010年第1期12卷 15-19页

作者： Hiroshi KASAHARA Tetsuo SEKI Kenji SAITO Ryuhei KUMAZAWA Takashi MUTOH goro nomura Fujio SHIMPO Shin KUBO Takashi SHIMOZUMA Yasuo YOSHIMURA Hiroe IGAMI Hiromi TAKAHASHI 赵燕平 Takuya OOSAKO Yuichi TAKASE National Institute for Fusion Science Institute of Plasma Physics Chinese Academy of Sciences University of Tokyo

In large helical device （LHD）, antenna loadings are different for minority ion cyclotron heating （MICH with 38.47 MHz） and mode-converted ion Bernstein wave heating （MC-IBW with 28.4 MHz）, and it is necessary to improve antenna loading with low heating efficiency to avoid arching on transmission line. To design a new ion cyclotron range of frequencies （ICRF） antenna in LHD, calculation for a simple antenna model is conducted using three-dimensional electrical magnetic code （high frequency structure simulator, HFSS） for an water loading as an imaginary plasma with low heating efficiency. At resonant frequencies, antenna loading is sensitive to strap width, and resonant frequencies are strongly related to strap height. There is no differences of RF current profile on the strap surface between resonant frequency and non-resonant frequency. The strap should be perpendicularly placed against the magnetic field line, since Faraday-shield angle will lead to a decrease in the effective antenna height.

关键词： ICRF minority heating mode conversion heating antenna design LHD

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Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD

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Plasma Science and Technology 2013年第3期15卷 209-212页

作者： Kenji SAITO Ryuhei KUMAZAWA Tetsuo SEKI Hiroshi KASAHARA goro nomura Fujio SHIMPO Hiroe IGAMI Mitsutaka ISOBE Kunihiro OGAWA Kazuo TOI Masaki OSAKABE Masaki NISHIURA Tsuguhiro WATANABE Satoshi YAMAMOTO Makoto ICHIMURA Takashi MUTOH National Institute for Fusion Science Graduate School of Engineering Nagoya University Institute of Advanced Energy Kyoto University Tsukuba University Plasma Research Center

Two pairs of high-frequency magnetic probes were installed in the Large Helical Device （LHD）. During the injection of a perpendicular neutral beam, ion cyclotron emissions （ICEs） with the fundamental frequency corresponding to the ion cyclotron frequency at the plasma edge were detected, which are the same type of ICE as measured with the former spare ion cyclotron range of frequencies （ICRF） heating antennas. This type of ICE was further investigated with regard to the phase and intensity of signals. Another type of ICE was found in the LHD, and these ICEs were synchronized with bursts of toroidicity induced Alfv^n eigenmodes （TAE） and the rise of intensity of lost ion flux. Therefore the source of these ICEs was thought to be the particles transferred from the core to the outer region of plasma by the TAE bursts. The frequency of ICEs induced by the TAE bursts increases linearly with the magnetic field strength, since the ion cyclotron frequency increases with the magnetic field strength.

关键词： LHD ICE TAE lost particle high-frequency magnetic probe

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维普期刊数据库

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Eigenvalue Analysis of Distributed Generation Including Multimass Turbine Model

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Journal of Energy and Power Engineering 2012年第12期6卷 1901-1910页

作者： Arwindra Rizqiawan goro Fujita Toshihisa Funabashi Masakatsu nomura Power System Laboratory Shibaura Institute of Technology Tokyo 135-8548 Japan Meidensha Corporation Tokyo 141-6029 Japan

This paper presents small-signal study based on eigenvalue analysis as a preliminary study to observe the interaction between multimass turbine-generator system and inverter-based distributed generation in a microgrid. The multimass turbine model is included in the overall distributed generation system model. Two case studies are demonstrated to observe the interaction between turbine-generator set and power electronics-based distributed generation system. Both case studies are in stand-alone and grid-connected operation. It can be shown that under stand-alone operation, unstable oscillatory modes may occur and be highly influenced by the operating points of the system.

关键词：分布式发电系统水轮机模型特征值分析发电机系统相互作用电子产品发电机组振荡模式

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