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Control system-plasma synchronization and naturally occurring edge localized modes in a tokamak

Chapman, S. C., Lang, P. T., Dendy, R. O., Giannone, L. and Watkins, Nicholas W. (2018) Control system-plasma synchronization and naturally occurring edge localized modes in a tokamak. Physics of Plasmas, 25. 062511. ISSN 1070-664X

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Identification Number: 10.1063/1.5025333

Abstract

Edge Localised Modes (ELMs) naturally occur in tokamak plasmas in high confinement mode. We find in ASDEX Upgrade that the plasma can transition into a state in which the control system field coil currents, required to continually stabilize the plasma, continually oscillate with the plasma edge position and total MHD energy. These synchronous oscillations are one-to-one correlated with the occurrence of natural ELMs; the ELMs all occur when the control system coil current is around a specific phase. This suggests a phase synchronous state in which nonlinear feedback between plasma and control system is intrinsic to natural ELMing, and in which the occurrence time of a natural ELM is conditional on the phase of the control system field coil current.

Item Type: Article
Official URL: https://aip.scitation.org/journal/php
Additional Information: © 2018 The Authors © CC BY 4.0
Divisions: Centre for Analysis of Time Series
Subjects: Q Science > QC Physics
Sets: Research centres and groups > Centre for the Analysis of Time Series (CATS)
Date Deposited: 04 Oct 2018 09:10
Last Modified: 20 Nov 2019 05:46
URI: http://eprints.lse.ac.uk/id/eprint/90325

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