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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
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Official URL: http://dx.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.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of 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 | |||||||||||||||
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| Date of first compliant deposit: | 27 June 2018 | |||||||||||||||
| 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 | |||||||||||||||
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