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Title: On fast radial propagation of parametrically excited geodesic acoustic mode

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.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou (China)
  2. (United States)
  3. ENEA C. R. Frascati, C. P. 65-00044 Frascati (Italy)
  4. (China)
Publication Date:
OSTI Identifier:
22408320
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; ANALYTICAL SOLUTION; DISPERSION RELATIONS; GEODESICS; IONS; LARMOR RADIUS; NONLINEAR PROBLEMS; NUMERICAL SOLUTION; PULSES; SOUND WAVES; SPACE DEPENDENCE; TIME DEPENDENCE; VELOCITY; WAVE PROPAGATION