WAVELET APPLICATION FOR REFLECTOMETRY OF PLASMA-DENSITY PROFILES

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