Observation of Helical Structure by Imaging Diagnostics in a Low-Aspect-Ratio Reversed Field Pinch
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概要
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Study of helical structure has been in progress in shallow reversal reversed field pinch (RFP) plasmas in a low-aspect-ratio machine RELAX (R/a = 0.5 m/0.25 m, A = 2) by using visible light and soft-X-ray (SXR) imaging diagnostics. Simple helix and its toroidal rotation have been observed in tangential visible light images taken by a high-speed camera. Similar simple filament structures have also been observed in tangential images obtained by a pin-hole SXR camera assembled with Image-intensified charged coupled device (ICCD). The SXR experimental images have been compared with calculated tangential images using model profiles for emissivity to identify the plausible SXR emissivity profile. It has been found that a model profile of helical core having SXR emissivity 2--4 times higher than the background provides 2D SXR images in reasonable agreement with the experimental results. Time evolution of the SXR emissivity profile measured with a photodiode array has shown that the emissivity is the highest in the core region with a quasi-periodic oscillation of the peak position.
- 2011-11-15
著者
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Sanpei Akio
Department Of Electronics And Information Science Kyoto Institute Of Technology
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Ikezoe Ryuya
Department Of Electronics Kyoto Institute Of Technology
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Oki Kensuke
Department Of Advanced Science For Electronics And Materials Kyushu University
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Masamune Sadao
Department Of Electrical Engineering Kyoto Institute Of Technology
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KOGUCHI Haruhisa
National Institute of Advanced Industrial Science and Technology (AIST)
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Onchi Takumi
Department Of Electronics Kyoto Institute Of Technology
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Himura Haruhiko
Department Of Electronics Kyoto Institute Of Technology
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Nishino Nobuhiro
Hiroshima University
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MASAMUNE Sadao
Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585, Japan
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Koguchi Haruhisa
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
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Nishino Nobuhiro
Hiroshima University, Higashihiroshima, Hiroshima 739-8511, Japan
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