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Application of wavelet spectral analysis to plasma fluctuation measurements using beam emission spectroscopy
- Source :
- Review of Scientific Instruments. 70:874-877
- Publication Year :
- 1999
- Publisher :
- AIP Publishing, 1999.
-
Abstract
- 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.
Details
- ISSN :
- 10897623 and 00346748
- Volume :
- 70
- Database :
- OpenAIRE
- Journal :
- Review of Scientific Instruments
- Accession number :
- edsair.doi...........2c65e3bacfa270e66a581cee387710c0