Relative Frequency Calibration for Fast Frequency Sweep Microwave Reflectometry
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概要
- 論文の詳細を見る
A frequency-modulated reflectometer with a frequency band of 26.5 to 40 GHz has been constructed and installed in the TST-2 spherical tokamak to measure fast density profile evolution. In order to calibrate the instantaneous frequency for various frequency sweep rates, a waveform matching method has been proposed and applied to the reflectometer. This method compares the interference patterns (i.e., waveforms) of a fixed target reflection, which do not depend on the sweep rate, and obtains the instantaneous frequency by fitting the target waveform time to the time for a reference sweep waveform. This allows evaluation of output frequency stability. The overall frequency error, including reproducibility, is around 0.1 GHz. Sweep rates up to 20 μs were used to measure the density profile evolution during rf heating.
- 社団法人 プラズマ・核融合学会の論文
著者
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Ejiri Akira
Graduate School Of Frontier Science University Of Tokyo
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KASAHARA Hiroshi
National Institute for Fusion Science
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YAMADA Takuma
Research Institute for Applied Mechanics, Kyushu University
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EJIRI Akira
Graduate School of Frontier Sciences, The University of Tokyo
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SHIMADA Yoshiyuki
Graduate School of Frontier Sciences, The University of Tokyo
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OOSAKO Takuya
Graduate School of Frontier Sciences, The University of Tokyo
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TAKASE Yuichi
Graduate School of Frontier Science, University Tokyo, Kashiwa 277-8561, Japan
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