Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode
- Авторы: Itoh K.1,2, Itoh S.2,3, Kosuga Y.3,4, Lesur M.3, Ido T.1
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Учреждения:
- National Institute for Fusion Science
- Research Center for Plasma Turbulence
- Research Institute for Applied Mechanics
- Institute for Advanced Study
- Выпуск: Том 42, № 5 (2016)
- Страницы: 418-423
- Раздел: Waves and Instabilities in Plasma
- URL: https://journals.rcsi.science/1063-780X/article/view/185710
- DOI: https://doi.org/10.1134/S1063780X16050056
- ID: 185710
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Аннотация
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.
Об авторах
K. Itoh
National Institute for Fusion Science; Research Center for Plasma Turbulence
Автор, ответственный за переписку.
Email: itoh@nifs.ac.jp
Япония, Toki; Kasuga
S.-I. Itoh
Research Center for Plasma Turbulence; Research Institute for Applied Mechanics
Email: itoh@nifs.ac.jp
Япония, Kasuga; Kasuga
Y. Kosuga
Research Institute for Applied Mechanics; Institute for Advanced Study
Email: itoh@nifs.ac.jp
Япония, Kasuga; Fukuoka
M. Lesur
Research Institute for Applied Mechanics
Email: itoh@nifs.ac.jp
Япония, Kasuga
T. Ido
National Institute for Fusion Science
Email: itoh@nifs.ac.jp
Япония, Toki