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Title: Identifying low-dimensional dynamics in type-I edge-localised-mode processes in JET plasmas

Abstract

Edge localised mode (ELM) measurements from reproducibly similar plasmas in the Joint European Torus (JET) tokamak, which differ only in their gas puffing rate, are analysed in terms of the pattern in the sequence of inter-ELM time intervals. It is found that the category of ELM defined empirically as type I-typically more regular, less frequent, and having larger amplitude than other ELM types-embraces substantially different ELMing processes. By quantifying the structure in the sequence of inter-ELM time intervals using delay time plots, we reveal transitions between distinct phase space dynamics, implying transitions between distinct underlying physical processes. The control parameter for these transitions between these different ELMing processes is the gas puffing rate.

Authors:
; ;  [1];  [2]; ;  [2]
  1. Department of Physics, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  2. EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB (United Kingdom)
Publication Date:
OSTI Identifier:
22130439
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 4; Other Information: (c) 2013 EURATOM; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY LAYERS; EDGE LOCALIZED MODES; JET TOKAMAK; PHASE SPACE; PLASMA; PLASMA CONFINEMENT; TIME DELAY

Citation Formats

Calderon, F. A., Chapman, S. C., Nicol, R. M., Dendy, R. O., Department of Physics, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, Webster, A. J., Alper, B., and Collaboration: JET EFDA Contributors. Identifying low-dimensional dynamics in type-I edge-localised-mode processes in JET plasmas. United States: N. p., 2013. Web. doi:10.1063/1.4802793.
Calderon, F. A., Chapman, S. C., Nicol, R. M., Dendy, R. O., Department of Physics, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, Webster, A. J., Alper, B., & Collaboration: JET EFDA Contributors. Identifying low-dimensional dynamics in type-I edge-localised-mode processes in JET plasmas. United States. https://doi.org/10.1063/1.4802793
Calderon, F. A., Chapman, S. C., Nicol, R. M., Dendy, R. O., Department of Physics, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, Webster, A. J., Alper, B., and Collaboration: JET EFDA Contributors. 2013. "Identifying low-dimensional dynamics in type-I edge-localised-mode processes in JET plasmas". United States. https://doi.org/10.1063/1.4802793.
@article{osti_22130439,
title = {Identifying low-dimensional dynamics in type-I edge-localised-mode processes in JET plasmas},
author = {Calderon, F. A. and Chapman, S. C. and Nicol, R. M. and Dendy, R. O. and Department of Physics, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL and Webster, A. J. and Alper, B. and Collaboration: JET EFDA Contributors},
abstractNote = {Edge localised mode (ELM) measurements from reproducibly similar plasmas in the Joint European Torus (JET) tokamak, which differ only in their gas puffing rate, are analysed in terms of the pattern in the sequence of inter-ELM time intervals. It is found that the category of ELM defined empirically as type I-typically more regular, less frequent, and having larger amplitude than other ELM types-embraces substantially different ELMing processes. By quantifying the structure in the sequence of inter-ELM time intervals using delay time plots, we reveal transitions between distinct phase space dynamics, implying transitions between distinct underlying physical processes. The control parameter for these transitions between these different ELMing processes is the gas puffing rate.},
doi = {10.1063/1.4802793},
url = {https://www.osti.gov/biblio/22130439}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 4,
volume = 20,
place = {United States},
year = {Mon Apr 15 00:00:00 EDT 2013},
month = {Mon Apr 15 00:00:00 EDT 2013}
}