American Institute of Physics;Melville: AIP Publishing
摘要:
摘要： The spatial and temporal evolution of parametrically excited geodesic acoustic mode (GAM) initial pulse is investigated both analytically and numerically. Our results show that the nonlinearly excited GAM propagates at a group velocity which is, typically, much larger than that due to finite ion Larmor radius as predicted by the linear theory. The nonlinear dispersion relation of GAM driven by a finite amplitude drift wave pump is also derived, showing a nonlinear frequency increment of GAM. Further implications of these findings for interpreting experimental observations are also discussed. 出版者： Melville: AIP Publishing 出版日期： 2015-04-01 出處： Physics of Plasmas, 2015-04, Vol.22 (4) 資源來源： AIP Publishing 版權： 2015 AIP Publishing LLC. 識別號： ISSN: 1070-664X 識別號： EISSN: 1089-7674 識別號： DOI: 10.1063/1.4918944
