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

K. Itoh, S. I. Itoh, Y. Kosuga, M. Lesur, T. Ido

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)418-423
Number of pages6
JournalPlasma Physics Reports
Volume42
Issue number5
DOIs
Publication statusPublished - May 1 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

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