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Application of wavelet spectral analysis to plasma fluctuation measurements using beam emission spectroscopy

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4 Author(s)
Jakubowski, M. ; Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706 ; Fonck, R. ; Kim, J.S. ; McKee, G.

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Beam emission spectroscopy (BES) measures localized density fluctuations in fusion plasma turbulence. A wavelet transform method of spectral analysis is applied to BES data to extract fluctuations without the long time-averaging characteristic of Fourier transform spectral analysis methods. This technique is used to observe an abrupt (∼100 μs) L–H transition on DIII–D. Wavelet-based cross correlation analysis can be used to obtain fluctuations of poloidal rotation velocity, and suggests opportunity for measurement of electrostatic potential fluctuation measurements. © 1999 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:70 ,  Issue: 1 )