量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Thomson scattering diagnostics provide electron temperature (Te) and density profiles in plasmas. They require measurements the scattered light, which are pulses with 10-100ns short, using fast digitizers. As a signal processing method for the fast digitizers, ”mode fitting” method is proposed for the switched-capacitor-type digitizers, such as CAEN V1742 and TechnoAP boards. ”Model fitting” is applied for a relatively low density LHD plasma. Te values and the magnitude of errors become small by this method. Simulating of signals with some noises based on the JT-60SA Thomson scattering system enables showing expected error in Te. The error can be suppressed by a model fitting method.
Fast signal modeling for Thomson scattering diagnostics and effects on electron temperature and density evaluation
