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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Duarte, V. N. [1, 2] ; Berk, H. L. [3] ; Gorelenkov, N. N. [2] ; Heidbrink, W. W. [4] ; Kramer, G. J. [2] ; Nazikian, R. [2] ; Pace, D. C. [5] ; Podesta, M. [2] ; Tobias, B. J. [2] ; Van Zeeland, M. A. [5]
Total Authors: 10
Affiliation:
[1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil
[2] Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 - USA
[3] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 - USA
[4] Univ Calif Irvine, Irvine, CA 92697 - USA
[5] Gen Atom Co, San Diego, CA 92186 - USA
Total Affiliations: 5
Document type: Journal article
Source: NUCLEAR FUSION; v. 57, n. 5 MAY 2017.
Web of Science Citations: 19
Abstract

A general criterion is proposed and found to successfully predict the emergence of chirping oscillations of unstable Alfvenic 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. 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. (AU)

FAPESP's process: 14/03289-4 - Quasilinear theory of energetic particles interaction with toroidicity-induced Alfvén eigenmodes
Grantee:Vinícius Njaim Duarte
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 12/22830-2 - Geodesic acoustic modes and Alfvén continuum in plasma columns with rotation
Grantee:Vinícius Njaim Duarte
Support type: Scholarships in Brazil - Doctorate