Ginzburg‐Landau Model in a Finite Shear‐Layer and Onset of Transport Barrier Nonlinear Oscillations: A Paradigm for TypeIII ELMs. Issue 6 (24th June 2016)

• Record Type: Journal Article
• Authors: Leconte, M.; Jeon, Y.M.; Yun, G. S.
• Is Part Of: Contributions to plasma physics. Volume 56:Issue 6/8(2016)
• Page Start: 736
• Page End: 741
• Publication Date: 2016-06-24
• Subjects: Transport barriers -- sheared flows -- Edge Localized Modes -- Ginzburg‐Landau -- nonlinear oscillations; Plasma (Ionized gases) -- Periodicals; Electronic journals; 530.44
• DOI: 10.1002/ctpp.201610050
• Languages: English
• ISSNs: 0863-1042

Abstract

Abstract: We study a Reaction‐Diffusion model describing the nonlinear oscillations of a transport barrier in a finite shear‐layer (width dE ≪ a ), where a is the plasma minor radius, based on a 1D reduced model derived to explain nonlinear barrier oscillations in 3D turbulence simulations [P. Beyer, S. Benkadda, G. Fuhr‐Chaudier et al., Phys. Rev. Lett.94, 105001 (2005)]. We show that this single nonlinear equation encompasses most of the physics of these barrier relaxations. The nonlinear oscillations have common characteristics with type‐III edge localized modes (ELMs), such as a repetition frequency which decreases with increasing power. In addition to the flow shear, the shear‐layer width is also shown to control the nature of the oscillations. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)