Improvements of CO2 Laser Heterodyne Imaging Interferometer for Electron Density Profile Measurements on LHD
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概要
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After installation of CO2 laser (wavelength 10.6 μm) heterodyne imaging interferometer (CO2 HI) in 2001, continuous developments have been carried out to improve the measurements capability and stability of operation. The CO2 HI works almost without phase jumping at high electron density (> 1 × 1020 m-3), where the existing far infrared laser (wavelength 118.9 μm) interferometer suffers from fringe jump due to the reduction of signal intensity caused by refraction. However a second interferometer is required to compensate mechanical vibration. A YAG laser (wavelength 1.06 μm) heterodyne imaging interferometer (YAG HI) is presently used for the vibration compensation. In the 10th LHD experimental campaign (2006∼2007), sixty four channels of CO2 HI to measure electron density profile and ten channels of YAG HI to measure mechanical vibration are working. A measurement example of a pellet fuelled high-density discharge is reported.
著者
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KAWAHATA Kazuo
National Insitute for Fusion Science
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TOKUZAWA Tokihiko
National Insitute for Fusion Science
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MICHAEL Clive
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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Okajima Shigeki
Department Of Applied Physics Chubu University
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ITO Yasuhiko
National Institute for Fusion Science
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Tanaka Kenji
National Food Institute
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VYACHESLAVOV Leonid
Budker Institute for Nuclear Physics, Novisibirsk, Russia
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SANIN Andrei
Budker Institute for Nuclear Physics, Novisibirsk, Russia
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AKIYAMA Takeshi
National Institute for Fusion Science, Toki 509-5292, Japan
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SANIN Andrei
Budker Institute of Nuclear Physics, 630090, Novosibirsk, RUSSIA
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OKAJIMA Shigeki
Department of Engimeering, Chubu Univertsity, Kasugai 487-8501, Japan
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TOKUZAWA Tokihiko
National Institute for Fusion Science, Toki 509-5292, Japan
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