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Reconstruction of Velocity Distribution of Density Bursts by Wavelet Analysis in the Linear Divertor Simulator NAGDIS‐II
Author(s) -
Ohno N.,
Budaev V. P.,
Furuta K.,
Miyoshi H.,
Takamura S.
Publication year - 2004
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200410032
Subject(s) - morlet wavelet , divertor , plasma , wavelet , physics , ion , distribution function , wavelet transform , saturation (graph theory) , mechanics , turbulence , mathematics , nuclear physics , thermodynamics , computer science , tokamak , discrete wavelet transform , quantum mechanics , combinatorics , artificial intelligence
We have investigated the velocity distribution of the intermittent bursty fluctuations in the ion saturation currents observed in the linear divertor plasma simulator, NAGDIS‐II. The intermittent bursty signals were analyzed by the wavelet transform with complex Morlet mother wavelet. Analyzing a lot of bursts in the ion saturation currents based on the wavelet cross‐correlation gives the velocity distribution function. It is positively skewed at the peripheral region of the plasma column, which means the intermittent bursts mainly propagate toward the wall. The averaged velocity depends on the neutral pressure associated with the transition between the attached and detached plasmas. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)