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| 1 | Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD显示文摘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'en 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. | 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 | 2013 | Plasma Science and Technology2013，15，3： | 0 |
| 2 | Investigation of Experimental Con6guration for Electron Bernstein Wave Heating on LHD显示文摘为在 LHD 上由使用加热的存在电子回旋加速器(ECH ) 加热天线的电子伯恩斯坦波浪(EBW ) 的试验性的配置的调查被执行。由使用在更低的港口安装的一条天线,指导倾斜的发射非凡(X---) 从高磁场方面(HFS ) 的模式是可得到的。自从折射索引的平行部件(因为磁场的不同类, N ||) 在繁殖期间变化,当发射 X 模式穿过甚至 N || 是的基本电子回旋加速器回声(ECR ) 层时, N || 能是零中午零开始。处于如此的一个条件,如果电子密度在某个水平上面,没有外面被抑制并且能对在 Doppler 被吸收的 EBW 变换模式,倾斜地发射的 X 模式能传递基本 ECR 层转移 ECR 层。由使用在水平港口安装的一条天线,向在稠密上的血浆的从更低的磁场方面(LFS ) 的倾斜的发射是可得到的。经由平常的模式(O) 的模式变换过程的 EBW 的刺激非凡的模式(X) 电子伯恩斯坦波浪(B) 被期望, O 模式向一个适当方向发射。O-X-B 模式变换率和力量免职的区域被改变磁场力量和发射方向调查。调查的结果建议在核心区域的有效加热由使用存在天线是困难的。发射天线的最后的镜子的重新整理可以被需要。 | Hiroe IGAMI Ryosuke IKEDA Hiromi TAKAHASHI Yasuo YOSHIMURA Takashi SHIMOZUMA Shin KUBO Hitoshi TANAKA Kazunobu NAGASAKI Takashi MUTOH the LHD Experiment Group | 2009 | Plasma Science and Technology2009，11，4： | 0 |
| 3 | Study of High Power ICRF Antenna Design in LHD显示文摘In large helical device (LHD), antenna loadings are different for minority ioncyclotron 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 heatingefficiency 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 usingthree-dimensional electrical magnetic code (high frequency structure simulator, HFSS) for anwater 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 tostrap height. There is no differences of RF current profile on the strap surface between resonantfrequency and non-resonant frequency. The strap should be perpendicularly placed against themagnetic field line, since Faraday-shield angle will lead to a decrease in the effective antenna height. | 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 | 2010 | Plasma Science and Technology2010，12，1： | 0 |
| 4 | Measurement of the Electron Bernstein Wave Emission with One of the Power Transmission Lines for ECH in LHD显示文摘Possibility of the measurement of radiated waves derived from the thermally emittedelectron Bernstein wave(EBW)is numerically investigated based on the assumption of the superdense core(SDC)plasma generated in LHD.EBW that is thermally emitted in the electroncyclotron resonance(ECR)layer may couple with the electromagnetic wave and be emitted to thevacuum via the EBW-extraordinary-ordinary(B-X-O)mode conversion process.We consider theuse of one of the transmission lines for electron cyclotron heating(ECH)in LHD as a receivingsystem of the emission.It is derived that the waves in the fundamental cyclotron frequency rangeare emitted as the EBW near their upper hybrid resonance(UHR)layer outside the last close fluxsurface(LCFS).On the other hand,waves in the second harmonics cyclotron frequency range areemitted in the core region.It means that successful measurement of waves of the second harmonicfrequency range emitted from extremely high dense core plasma with setting an aim angle forreceiving indicates a possibility of the second harmonic ECH by EBW in the core region withsetting the same aim angle and the same polarization for launching. | Hiroe IGAMI Hiroshi IDEI Shin KUBO Yasuo YOSHIMURA Takashi SHIMOZUMA Hiromi TAKAHASHI | 2011 | Plasma Science and Technology2011，13，4： | 0 |
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