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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.)

Resonance frequency broadening of wave-particle interaction in tokamaks due to Alfvenic eigenmode

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Author(s):
Meng, G. [1, 2, 3] ; Gorelenkov, N. N. [1] ; Duarte, V. N. [4, 1] ; Berk, H. L. [5] ; White, R. B. [1] ; Wang, X. G. [2, 3, 6]
Total Authors: 6
Affiliation:
[1] Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 - USA
[2] Peking Univ, Fus Simulat Ctr, Beijing 100871 - Peoples R China
[3] Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871 - Peoples R China
[4] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil
[5] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 - USA
[6] Harbin Inst Technol, Dept Phys, Harbin 150001, Heilongjiang - Peoples R China
Total Affiliations: 6
Document type: Journal article
Source: NUCLEAR FUSION; v. 58, n. 8 AUG 2018.
Web of Science Citations: 7
Abstract

We use the guiding center code ORBIT to study the broadening of resonances and the parametric dependence of the resonance frequency broadening width Delta Omega on the nonlinear particle trapping frequency w(b) of wave-particle interaction with specific examples using realistic equilibrium DIII-D shot 159243 (Collins et al 2016 Phys. Rev. Lett. 116 095001). When the mode amplitude is small, the pendulum approximation for energetic particle dynamics near the resonance is found to be applicable and the ratio of the resonance frequency width to the deeply trapped bounce frequency Delta Omega/w(b) equals 4, as predicted by theory. It is found that as the mode amplitude increases, the coefficient a = Delta Omega/w(b) becomes increasingly smaller because of the breaking down of the nonlinear pendulum approximation for the wave-particle interaction. (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