Radial variation of heat transport in L-mode JET discharges

B. Ph. van Milligen, JET Contributors, Tommy Ahlgren

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In this paper, we analyze heat transport in the JET tokamak using data from its high resolution ECE diagnostic and analyses based on the transfer entropy (TE). The analysis reveals that heat transport is not smooth and continuous, but is characterized by 'trapping regions' separated by `minor transport barriers'. Meat may 'jump over' these barriers and when the heating power is raised, this 'jumping' behavior becomes more prominent. To check that our results are relevant for global heat transport, we deduced an effective diffusion coefficient from the TE results. Both its value and overall radial variation are consistent with heat diffusivities reported in literature. The detailed radial structure of the effective diffusion coefficient was shown to be linked to the mentioned minor transport barriers.

Original languageEnglish
Article number056006
JournalNuclear Fusion
Volume59
Issue number5
Number of pages10
ISSN0029-5515
DOIs
Publication statusPublished - May 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • BARRIERS
  • ELECTRON THERMAL TRANSPORT
  • MODULATION EXPERIMENTS
  • PERTURBATIVE TRANSPORT
  • PLASMAS
  • RTP
  • TURBULENCE
  • fusion
  • heat transport
  • magnetic confinement
  • transport barriers
  • 114 Physical sciences

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