Spatio-temporal evolution of the L → H and H → L transitions

K. Miki, P. H. Diamond, N. Fedorczak, Ö D. Gürcan, M. Malkov, C. Lee, Y. Kosuga, G. Tynan, G. S. Xu, T. Estrada, D. McDonald, L. Schmitz, K. J. Zhao

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Abstract

Understanding the L → H and H → L transitions is crucial to successful ITER operation. In this paper we present novel theoretical and modelling study results on the spatio-temporal dynamics of the transition. We place a special emphasis on the role of zonal flows and the micro → macro connection between dynamics and the power threshold (PT) dependences. The model studied evolves five coupled fields in time and one space dimension, in simplified geometry. The content of this paper is (a) the model fundamentals and the space-time evolution during the L → I → H transition, (b) the physics origin of the well-known ∇B-drift asymmetry in PT, (c) the role of heat avalanches in the intrinsic variability of the L → H transition, (d) the dynamics of the H → L back transition and the physics of hysteresis, (e) conclusion and discussion, with a special emphasis on the implications of transition dynamics for the L → H power threshold scalings.

Original languageEnglish
Article number073044
JournalNuclear Fusion
Volume53
Issue number7
DOIs
Publication statusPublished - Jul 1 2013

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thresholds
physics
avalanches
hysteresis
asymmetry
scaling
heat
geometry

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Miki, K., Diamond, P. H., Fedorczak, N., Gürcan, Ö. D., Malkov, M., Lee, C., ... Zhao, K. J. (2013). Spatio-temporal evolution of the L → H and H → L transitions. Nuclear Fusion, 53(7), [073044]. https://doi.org/10.1088/0029-5515/53/7/073044

Spatio-temporal evolution of the L → H and H → L transitions. / Miki, K.; Diamond, P. H.; Fedorczak, N.; Gürcan, Ö D.; Malkov, M.; Lee, C.; Kosuga, Y.; Tynan, G.; Xu, G. S.; Estrada, T.; McDonald, D.; Schmitz, L.; Zhao, K. J.

In: Nuclear Fusion, Vol. 53, No. 7, 073044, 01.07.2013.

Research output: Contribution to journalArticle

Miki, K, Diamond, PH, Fedorczak, N, Gürcan, ÖD, Malkov, M, Lee, C, Kosuga, Y, Tynan, G, Xu, GS, Estrada, T, McDonald, D, Schmitz, L & Zhao, KJ 2013, 'Spatio-temporal evolution of the L → H and H → L transitions', Nuclear Fusion, vol. 53, no. 7, 073044. https://doi.org/10.1088/0029-5515/53/7/073044
Miki K, Diamond PH, Fedorczak N, Gürcan ÖD, Malkov M, Lee C et al. Spatio-temporal evolution of the L → H and H → L transitions. Nuclear Fusion. 2013 Jul 1;53(7). 073044. https://doi.org/10.1088/0029-5515/53/7/073044
Miki, K. ; Diamond, P. H. ; Fedorczak, N. ; Gürcan, Ö D. ; Malkov, M. ; Lee, C. ; Kosuga, Y. ; Tynan, G. ; Xu, G. S. ; Estrada, T. ; McDonald, D. ; Schmitz, L. ; Zhao, K. J. / Spatio-temporal evolution of the L → H and H → L transitions. In: Nuclear Fusion. 2013 ; Vol. 53, No. 7.
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