Analysis of tokamak data using a novel Hilbert transform based technique

Journal Article · Tue Aug 15 04:00:00 EDT 2006 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2218491· OSTI ID:20860193

Jha, R; Raju, D; Sen, A ^[1]

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1. Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

A novel data analysis technique based on the 'empirical mode decomposition' and Hilbert transform is applied to the analysis of edge fluctuation data and Mirnov coil data from the ADITYA tokamak [S. B. Bhatt et al., Ind. J. Pure Appl. Phys. 27, 710 (1989)]. It is shown that the edge fluctuations can be well represented by a finite number of about 10 discrete modes. Their instantaneous energies show intermittent bursts and the high frequency modes are nonstationary. The technique is further developed to study three-mode interactions and employed to show that triplet interactions are statistically significant among high frequency modes of the fluctuation data. A general critique of the method is presented and its utility for the analysis of nonlinear phenomena in complex systems like plasma turbulence is highlighted.

• OSTI ID: 20860193
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 13; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ADITYA TOKAMAK
BOUNDARY LAYERS
DATA ANALYSIS
FLUCTUATIONS
NONLINEAR PROBLEMS
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
TRIPLETS
TURBULENCE