Journal
SCIENTIFIC REPORTS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41598-022-19328-9
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- JSPS KAKENHI [15KK0245]
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Thomson scattering measurements using a high-repetition-rate laser have been conducted in the Large Helical Device. As an example, measurements at a 20 kHz repetition rate were performed in hydrogen pellet-injected plasmas. Signal processing methods were developed to evaluate electron temperature profiles at nearly 70 spatial points with time intervals of 50 μs. Electron density profiles were derived after Raman scattering calibration, and rapid changes in electron temperature and density profiles within 1 ms were observed.
Thomson scattering measurements with a high-repetition-rate laser have commenced in the Large Helical Device. As an example of the fast phenomena captured by this diagnostic system, measurements at a 20 kHz repetition-rate in hydrogen pellet-injected plasmas are presented. Signal processing methods for this measurement have been developed and electron temperature profiles with almost 70 spatial points were evaluated at time intervals of 50 mu s. After Raman scattering calibration, electron density profiles were derived. Fast changes in the electron temperature and density profiles within 1 ms were observed.
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