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Title: Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode

Abstract

An analytic model is developed for understanding the abrupt onset of geodesic acoustic mode (GAM) in the presence of chirping energetic-particle-driven GAM (EGAM). This abrupt excitation phenomenon has been observed on LHD plasma. Threshold conditions for the onset of abrupt growth of GAM are derived, and the period doubling phenomenon is explained. The phase relation between the mother mode (EGAM) and the daughter mode (GAM) is also discussed. This result contributes to the understanding of “trigger problems” of laboratory and nature plasmas.

Authors:
 [1]; ;  [2];  [3]
  1. Kyushu University, Research Center for Plasma Turbulence (Japan)
  2. Kyushu University, Research Institute for Applied Mechanics (Japan)
  3. National Institute for Fusion Science (Japan)
Publication Date:
OSTI Identifier:
22614133
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 42; Journal Issue: 5; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EXCITATION; GEODESICS; LHD DEVICE; PLASMA; SOUND WAVES

Citation Formats

Itoh, K., E-mail: itoh@nifs.ac.jp, Itoh, S. -I., Kosuga, Y., Lesur, M., and Ido, T. Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode. United States: N. p., 2016. Web. doi:10.1134/S1063780X16050056.
Itoh, K., E-mail: itoh@nifs.ac.jp, Itoh, S. -I., Kosuga, Y., Lesur, M., & Ido, T. Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode. United States. https://doi.org/10.1134/S1063780X16050056
Itoh, K., E-mail: itoh@nifs.ac.jp, Itoh, S. -I., Kosuga, Y., Lesur, M., and Ido, T. 2016. "Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode". United States. https://doi.org/10.1134/S1063780X16050056.
@article{osti_22614133,
title = {Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode},
author = {Itoh, K., E-mail: itoh@nifs.ac.jp and Itoh, S. -I. and Kosuga, Y. and Lesur, M. and Ido, T.},
abstractNote = {An analytic model is developed for understanding the abrupt onset of geodesic acoustic mode (GAM) in the presence of chirping energetic-particle-driven GAM (EGAM). This abrupt excitation phenomenon has been observed on LHD plasma. Threshold conditions for the onset of abrupt growth of GAM are derived, and the period doubling phenomenon is explained. The phase relation between the mother mode (EGAM) and the daughter mode (GAM) is also discussed. This result contributes to the understanding of “trigger problems” of laboratory and nature plasmas.},
doi = {10.1134/S1063780X16050056},
url = {https://www.osti.gov/biblio/22614133}, journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 5,
volume = 42,
place = {United States},
year = {2016},
month = {5}
}