An algorithm to remove fringe jumps and its application to microwave reflectometry
作者： A Ejiri , K Shinohara , K Kawahata
DOI: 10.1088/0741-3335/39/12/003
关键词: Algorithm 、 Reflectometry 、 Range (statistics) 、 Tokamak 、 Plasma 、 Jump 、 Microwave 、 Smoothing 、 Phase (waves) 、 Physics
摘要: In some plasma discharges, the phase measured by microwave reflectometry has many fringe ( radians) jumps. A new algorithm to detect and remove jumps been developed, applied data in JIPP TII-U tokamak. Using this algorithm, quantitative properties of jumps, their effects on analysis fluctuations are investigated. It was found that occurrence obeys a Poisson process, time scale is distributed over wide range. Fringe affect mainly low-frequency components fluctuations. Comparison corrected calculated from smoothed signals indicates smoothing (or frequency filtering) an effective way obtain information concerning macroscopic density profile. jump runaway can be phenomenologically explained distribution complex amplitude reflected wave.
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