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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.)

Stochastic effects on phase-space holes and clumps in kinetic systems near marginal stability

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Author(s):
Woods, B. J. Q. [1] ; Duarte, V. N. [2, 3] ; De-Gal, A. J. [1] ; Gorelenkov, N. N. [3] ; Vann, R. G. L. [1]
Total Authors: 5
Affiliation:
[1] Univ York, York Plasma Inst, Dept Phys, York YO10 5DD, N Yorkshire - England
[2] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil
[3] Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 - USA
Total Affiliations: 3
Document type: Journal article
Source: NUCLEAR FUSION; v. 58, n. 8 AUG 2018.
Web of Science Citations: 3
Abstract

The creation and subsequent evolution of marginally-unstable modes have been observed in a wide range of fusion devices. This behaviour has been successfully explained, for a single frequency shifting mode, in terms of phase-space structures known as a `hole' and `clump'. Here, we introduce stochasticity into a 1D kinetic model, affecting the formation and evolution of resonant modes in the system. We find that noise in the fast particle distribution or electric field leads to a shift in the asymptotic behaviour of a chirping resonant mode; this noise heuristically maps onto radial microturbulence via canonical toroidal momentum scattering, affecting hole and clump formation. While the mechanism allowing for the formation of the hole and clump is coherent, the lifetime of a hole and clump is shown to be highly sensitive to initial conditions, affecting the temporal profile of a single bursting event in mode amplitude. (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