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.

DOI: https://doi.org/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.

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• Item ORO ID
• 55637
• Item Type
• Journal Item
• ISSN
• 1070-664X
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	210130335	European Union Horizon 2020
  Energy Programme	EP/P012450/1	RCUK (Research Councils UK)

• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
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• © 2018 The Authors
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