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

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Chapman, Sandra C., Lang, P. T., Dendy, R. O., Giannone, L., Watkins, Nicholas W. and ASDEX Upgrade Team, (2018) Control system-plasma synchronization and naturally occurring edge localized modes in a tokamak. Physics of Plasmas, 25 (6). 062511. doi:10.1063/1.5025333 ISSN 1089-7674.

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Official URL: http://dx.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 Article
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Tokamaks, Edge-localized modes
Journal or Publication Title: Physics of Plasmas
Publisher: American Institute of Physics
ISSN: 1089-7674
Official Date: 2018
Dates:
DateEvent
2018Published
26 June 2018Available
26 June 2018Accepted
Volume: 25
Number: 6
Article Number: 062511
DOI: 10.1063/1.5025333
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 27 June 2018
Date of first compliant Open Access: 28 June 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
210130335H2020 European Research Councilhttp://dx.doi.org/10.13039/100010663
EP/P012450/1]Research Councils UKhttp://dx.doi.org/10.13039/501100000690
FA9550-17-1- 0054Fulbright Associationhttp://dx.doi.org/10.13039/100010629
FA9550-17-1- 0054Lloyd's (Firm) http://viaf.org/viaf/126447642
Contributors:
ContributionNameContributor ID
Research GroupASDEX Upgrade Team, UNSPECIFIED

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