Comparison of Conditional Average Using Threshold and Template Methods for Quasi-Periodic Phenomena in Plasmas

Fumiyoshi KIN; Kimitaka ITOH; Tim HAPPEL; Gregor BIRKENMEIER; Akihide FUJISAWA; Sigeru INAGAKI; Sanae-I. ITOH; Ulrich STROTH; ASDEX Upgrade Team

doi:10.1585/pfr.14.1402114

Regular Articles

Comparison of Conditional Average Using Threshold and Template Methods for Quasi-Periodic Phenomena in Plasmas

Fumiyoshi KIN, Kimitaka ITOH, Tim HAPPEL, Gregor BIRKENMEIER, Akihide FUJISAWA, Sigeru INAGAKI, Sanae-I. ITOH, Ulrich STROTH, ASDEX Upgrade Team

Author information

Fumiyoshi KIN
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
Kimitaka ITOH
Institute of Science and Technology Research, Chubu University
National Institute for Fusion Science
Research Center for Plasma Turbulence, Kyushu University
Tim HAPPEL
Max Plank Institute for Plasma Physics
Gregor BIRKENMEIER
Max Plank Institute for Plasma Physics
Physik-Department E28, Technische Universitat München
Akihide FUJISAWA
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Sigeru INAGAKI
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Sanae-I. ITOH
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Department of Innovative Energy Science and Engineering, Graduate School of Enginerring, Chubu University
Ulrich STROTH
Max Plank Institute for Plasma Physics
Physik-Department E28, Technische Universitat München
ASDEX Upgrade Team

Keywords: conditional averaging, template method, threshold method, magnetic burst, intermittence, ASDEX Upgrade, I-mode plasma

JOURNAL FREE ACCESS

2019 Volume 14 Pages 1402114

DOI https://doi.org/10.1585/pfr.14.1402114

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Abstract

The comparison of conditional averaging using so-called threshold and template methods is made in their application on quasi-periodic burst of I-mode in ASDEX Upgrade (AUG) I-mode plasma. For obtaining conditionally averaged waveforms, three different manners to determine the ‘clocks', using raw signal, envelope of the signal and numerical filtering, are applied to each method. The comparison demonstrates the excellency of the template method to extract typical characteristics of target phenomena in its uniqueness to select the ensemble waveforms and its good convergence property.

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