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Wavelet Application for Reflectometry of Plasma Density Profiles

A new method of plasma density profile reconstruction in microwave reflectometry is proposed and implemented on an ultra-fast swept broadband reflectometer of a GAMMA10 mirror device. The proposed method makes use of the wavelet transform of the detected signal. Excellent resolution in the time-frequency domain, inherent to wavelet analysis, allows one to obtain an electron density radial profile for almost every frequency sweep. A wavelet-based profile reconstruction algorithm is especially advantageous for monitoring transient plasma phenomena and fast processes, such as in pellet injection, ultra-fast swept reflectometry and short pulsed reflectometry.