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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.; Watkins, N. W. and ASDEX Upgrade Team (2018). Control system-plasma synchronization and naturally occurring edge localized modes in a tokamak. Physics of Plasmas, 25(6), article no. 062511.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1063/1.5025333
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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: Journal Item
Copyright Holders: 2018 The Authors
ISSN: 1070-664X
Project Funding Details:
Funded Project NameProject IDFunding Body
Not Set210130335European Union Horizon 2020
Energy ProgrammeEP/P012450/1RCUK (Research Councils UK)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 55637
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 02 Jul 2018 08:09
Last Modified: 15 Sep 2018 07:29
URI: http://oro.open.ac.uk/id/eprint/55637
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