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Spectroscopic study of recombination continuum in arc-heated cold expanding plasma jet
Affiliation:1. Department of Nuclear Engineering, Tokyo Institute of Technology, 2-12-1-N1-10, O-Okayama, Meguro-ku, Tokyo 152-8550, Japan;2. Technical Department, Tokyo Institute of Technology, 2-12-1-N1-10, O-Okayama, Meguro-ku, Tokyo 152-8550, Japan;3. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-10, O-Okayama, Meguro-ku, Tokyo 152-8550, Japan;1. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China;2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China;3. WCI for Fusion Theory, National Fusion Research Institute, 52 Eoeun-Dong, Yusung-Gu, Daejeon 305-333, Republic of Korea;1. Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka, Niigata 940-2188, Japan;2. Tokyo Institute of Technology, Nagatsuta 4259, Yokohama, Kanagawa 226-8502, Japan;1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1, N1-7, O-okayama, Meguro-ku, Tokyo 152-8550, Japan;2. Department of Mechanical Engineering, Muroran Institute of Technology, 27-1, Mizumoto-cho, Muroran, Hokkaido 050-8585, Japan;1. Department of Nuclear Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan;2. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan;1. Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, Novi Sad, Serbia;2. Institute of Nuclear Sciences Vinca, University of Belgrade, Belgrade, Postanski fah 522, Serbia
Abstract:Cold recombining H2–He mixture plasma and pure He plasma with low electron density are generated by arc discharge followed by expansion into a lower-pressure vessel, and their recombination radiation is analyzed by optical emission spectroscopic measurement. Their electron temperature is determined from the continuum spectra, which is found to agree with those determined from the line intensities of LTE levels within 10% accuracy. Meanwhile, the agreement of electron density is found to be about 20–25%. It is experimentally found that the conventional theory of spectral intensity of the recombination continuum explains the observed continuum spectra very well even for very low electron temperature within the range from 0.07 to 0.2 eV.
Keywords:Recombination continuum  Optical emission spectroscopic measurement  Electron temperature and density
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