Strong Destabilization of Stable Modes with a Half-Frequency Associated with Chirping Geodesic Acoustic Modes in the Large Helical Device | Zendy

T. Ido | Zendy; K. Itoh | Zendy; M. Osakabe | Zendy; M. Lesur | Zendy; A. Shimizu | Zendy; K. Ogawa | Zendy; K. Toi | Zendy; M. Nishiura | Zendy; Susumu Katō | Zendy; M. Sasaki | Zendy; K. Ida | Zendy; S. Inagaki | Zendy; S.I. Itoh | Zendy

Open Access

Strong Destabilization of Stable Modes with a Half-Frequency Associated with Chirping Geodesic Acoustic Modes in the Large Helical Device

Author(s) -

T. Ido,

K. Itoh,

M. Osakabe,

M. Lesur,

A. Shimizu,

K. Ogawa,

K. Toi,

M. Nishiura,

Susumu Katō,

M. Sasaki,

K. Ida,

S. Inagaki,

S.I. Itoh

Publication year - 2016

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.116.015002

Subject(s) - chirp , geodesic , physics , mode (computer interface) , excitation , nonlinear system , computational physics , acoustics , optics , laser , mathematical analysis , quantum mechanics , mathematics , computer science , operating system

Équipe 107 : Physique des plasmas chaudsInternational audienceAbrupt and strong excitation of a mode has been observed when the frequency of a chirping energetic-particle driven geodesic acoustic mode (EGAM) reaches twice the geodesic acoustic mode (GAM) frequency. The frequency of the secondary mode is the GAM frequency, which is a half-frequency of the primary EGAM. Based on the analysis of spatial structures, the secondary mode is identified as a GAM. The phase relation between the secondary mode and the primary EGAM is locked, and the evolution of the growth rate of the secondary mode indicates nonlinear excitation. The results suggest that the primary mode ( EGAM) contributes to nonlinear destabilization of a subcritical mode

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