Alfvén eigenmodes including magnetic island effects in the TJ-II stellarator. (17th August 2015)

• Record Type: Journal Article
• Authors: Sun, B.J.; Ochando, M.A.; López-Bruna, D.
• Is Part Of: Nuclear fusion. Volume 55:Number 9(2015:Sep.)
• Publication Date: 2015-08-17
• Subjects: stellarator -- Alfvén wave -- magnetic island; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/0029-5515/55/9/093023
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Coherent modes in NBI-heated plasmas of the TJ-II stellarator at frequencies generally below those of helicity induced Alfvén eigenmodes ( ) are explained as global Alfvén eigenmodes (GAE) and discrete shear-Alfvén eigenmodes induced by a non-rotating magnetic island (MIAE). Rotating islands are also found to interact with Alfvén eigenmodes: if they share the same helicity, they disturb each other; otherwise, new Alfvén modes can be excited via wave-wave coupling.