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Spectroscopic Studies on Impurity Transport of Core and Edge Plasmas in LHD

Plasma Science and Technology 2006年第1期8卷 55-60页

作者： Shigeru MORITA Motoshi GOTO SadatsuguMUTO Ryuji KATAI hisamichi yamazaki Hideaki NOZATO AtsuslliI WAMAE Makoto ATAKE Takashi FUJIMOTO Atsushi SAKAUE Hiroaki NISHIMURA Ikuya SAKURAI Chiho MATSUMOTO Akihiro FURUZAWA Yuzuru TAWARA Mitsutoshi ARAMAKI Yuji OKUMURA Koichi SASAKI 龚先祖李建刚万宝年崔正英 National Institute for Fusion Science Toki 509-5292Japan Department of Fusion Science Graduate University for Advanced StudiesToki 509-5292Japan National Institute of Advanced Industrial Science and Technology Tsukuba 305-8563Japan Department of Engineering Physics Kyoto UniversityKyoto 606-8502Japan Institute of Laser Engineering Osaka UniversityOsaka 565-0871Japan Eco Topia Science Institute Nagoya UniversityNagoya 464-8603Japan Department of Electrical Engineering and Computer Science Nagoya UniversityNagoya 464-8603Japan Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Southwestern Institute of Physics Chengdu 610041China

Spectroscopic diagnostics have been extensively developed for studies of impurity and neutral particle transports at core and edge plasmas in LHD. Diagnostics of core plasmas are similar to a tokamak case, i.e., Zeff from visible bremsstrahlung, K-x-ray measurements from xray spectroscopy using Si（Li） detectors and a compact crystal spectrometer, and high-Z impurity diagnostics from VUV spectroscopy using a flat-field EUV spectrometer. A combination of impurity pellet injection and visible bremsstrahlung is an active tool for determination of the diffusion coeffici＇ent D and convective velocity V. Using this tool the spatial structures of D and V are obtained and discussed with a neoclassical effect. On the other hand, the spectroscopic method for edge diagnostics is considerably different from the tokamak case because of the existence of a thick ergodic layer in addition to the z-points necessarily included into the diagnostic chord view. In order to break this negative situation, Zeeman and polarization spectroscopy are adopted to LHD edge plasmas. As a result, 2-dimensional emission contours of HeI and Ha are successfully obtained. Laser absorption spectroscopy is tried to measure hydrogen neutrals directly. Radial profiles of edge impurities are also measured with a mirror-assembled 3 m VUV spectrometer. Recent results of and progress in LHD spectroscopy are briefly reviewed.

关键词： impurity transport plasma spectroscopy hydrogen neutral

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