title: New type of wavelet-based spectral analysis by which modes with different toroidal mode number are separated.
abstract: A new type of wavelet-based analysis for the magnetic fluctuations by which toroidal mode number can be resolved is proposed. By using a wavelet, having a different phase toroidally, a spectrogram with a specific toroidal mode number can be obtained. When this analysis is applied to the measurement of the fluctuations observed in the large helical device, MHD activities having similar frequency in the laboratory frame can be separated from the difference of the toroidal mode number. It is useful for the non-stationary MHD activity. This method is usable when the toroidal magnetic probes are not symmetrically distributed.
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan and SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ohdachi