Identification of short-lived and localized coherent structures in plasma turbulence by window biorthogonal decomposition

Abstract

An alternative biorthogonal decomposition technique called the window biorthogonal decomposition (WBD) technique is introduced to analyze the coherent structures in the tokamak plasma turbulence. It can spot the short-lived and localized coherent structures in spatiotemporal turbulence signal and extract them out of the incoherence background. As an example, the localized and short-lived coherent structures existing stochastically in the CT-6B tokamak radial direction are analyzed by WBD.