Highly time-resolved evaluation technique of instantaneous amplitude and phase difference using analytic signals for multi-channel diagnostics

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A fluctuation analysis technique using analytic signals is proposed. Analytic signals are suitable to characterize a single mode with time-dependent amplitude and frequency, such as an MHD mode observed in fusion plasmas since the technique can evaluate amplitude and frequency at a specific moment without limitations of temporal and frequency resolutions, which is problematic in Fourier-based analyses. Moreover, a concept of instantaneous phase difference is newly introduced, and error of the evaluated phase difference and its error reduction techniques using conditional/ensemble averaging are discussed. These techniques are applied to experimental data of the beam emission spectroscopic measurement in the Heliotron J device, which demonstrates that the technique can describe nonlinear evolution of MHD instabilities. This technique is widely applicable to other diagnostics having necessity to evaluate phase difference.
Publisher
AMER INST PHYSICS
Issue Date
2014-11
Language
English
Article Type
Article
Keywords

HELIOTRON-J

Citation

REVIEW OF SCIENTIFIC INSTRUMENTS, v.85, no.11

ISSN
0034-6748
DOI
10.1063/1.4891102
URI
http://hdl.handle.net/10203/195141
Appears in Collection
RIMS Journal Papers
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