Plasma and Fusion Research
Volume 17, 2402032 (2022)
Regular Articles
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan
- 1)
- National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
- 2)
- Korea Institute of Fusion Energy, Daejeon 34133, Korea
- 3)
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
Abstract
As a signal processing method for fast digitizers of the switched-capacitor-type in Thomson scattering diagnostics, a “model fitting” method is proposed. An ideal shape of the signal is estimated by this method by averaging many Thomson scattering signals. After applying this method to a relatively low density LHD plasma, the scattering of electron temperature profiles becomes small. The magnitude of error is also reduced by about 60% at some spatial channels in the core plasma. Simulations of signals with some noises based on the JT-60SA Thomson scattering system enables a showing of the expected error in electron temperature. The error can be suppressed by the “model fitting” method.
Keywords
Thomson scattering, electron temperature, signal processing
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