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Title: Prediction of nonlinear evolution character of energetic-particle-driven instabilities

A general criterion is proposed and found to successfully predict the emergence of chirping oscillations of unstable Alfvénic eigenmodes in tokamak plasma experiments. The model includes realistic eigenfunction structure, detailed phase-space dependences of the instability drive, stochastic scattering and the Coulomb drag. The stochastic scattering combines the effects of collisional pitch angle scattering and micro-turbulence spatial diffusion. Furthermore, the latter mechanism is essential to accurately identify the transition between the fixed-frequency mode behavior and rapid chirping in tokamaks and to resolve the disparity with respect to chirping observation in spherical and conventional tokamaks.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [3] ;  [5] ;  [3] ;  [3] ;  [5]
  1. Univ. of Sao Paulo, Sao Paulo (Brazil); Princeton Univ., Princeton, NJ (United States)
  2. Univ. of Texas, Austin, TX (United States)
  3. Princeton Univ., Princeton, NJ (United States)
  4. Univ. of California, Irvine, CA (United States)
  5. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698; 2012/22830-2; 2014/03289-4; AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 5; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fast ions; non-linear dynamics; wave chirping; plasma instabilities
OSTI Identifier:
1375927
Alternate Identifier(s):
OSTI ID: 1420377