Abstract

A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on-and off-Axis in minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.

Original languageEnglish
Article number026028
JournalNuclear Fusion
Volume58
Issue number2
DOIs
Publication statusPublished - Feb 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • gyrokinetic simulations
  • light impurities in JET
  • nuclear fusion
  • quasilinear simulations
  • turbulent transport

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