Multimode excitation during the inter-ELM-crash periods in KSTAR H-mode plasma. (5th June 2015)

• Record Type: Journal Article
• Authors: Kim, M.; Lee, J.; Park, H.K.; Yun, G.S.; Lee, W.; Domier, C.W.; N.C., Luhmann
• Other Names: collab.
• Is Part Of: Nuclear fusion. Volume 55:Number 7(2015:Jul.)
• Publication Date: 2015-06-05
• Subjects: ELMs -- ECEI -- KSTAR -- multi-mode; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/0029-5515/55/7/073001
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Temporal and spatial modulation of the edge localized mode (ELM) structure has been observed during the inter-ELM-crash period by toroidally-separated two electron cyclotron emission imaging systems. The observed modulation is interpreted as a beat wave of two modes with adjacent toroidal mode number. An additional assumption is that each mode has to have a different poloidal rotation speed. In nonlinear simulation, the low- n mode can be driven by locking between the dominant modes. The modulation is reconstructed using beat waves not the locking of modes.