Wave Characteristics in the Electron Cyclotron Range of Frequencies in Overdense Plasmas in the Internal Coil Device Mini-RT
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概要
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In the internal coil device Mini-RT, overdense plasmas have been observed, and heating by electron Bernstein waves (EBWs) is expected. EBWs, which have no cutoff density, are electrostatic-mode waves converted from the electromagnetic mode. To examine mode conversion in Mini-RT experiments, we are attempting to investigate the propagation of waves in the electron cyclotron range of frequencies (ECRF) in overdense plasmas. We injected diagnostic microwaves (typically 1 GHz) into a plasma produced by 2.45 GHz microwaves and directly measured their characteristics by inserting various probing antennas into the plasma with an interference system. Electromagnetic field measurements revealed a long-wavelength mode in the area with lower density than the upper hybrid resonance (UHR) region. In the area with higher density than that of the UHR region, waves having the characteristics of EBWs were observed; namely, short wavelength (∼20 mm), electrostatic mode, longitudinal polarization, and backward wave mode. These results suggest that EBWs were mode converted from electromagnetic waves at the UHR.
著者
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Morikawa Junji
Graduate School Of Engineering The University Of Tokyo
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Yatsuka Eiichi
Graduate School Of Frontier Sciences The University Of Tokyo
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Ogawa Yuichi
Graduate School of Agriculture, Kyoto University
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YATSUKA Eiichi
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan
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MORIKAWA Junji
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan
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UCHIJIMA Kenichiro
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan
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OKABE Keigo
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan
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HONDA Akihiro
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan
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KINJO Kiyotake
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan
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