Momentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple

Research output: Contribution to journalArticleScientificpeer-review


  • P. C. De Vries
  • T. W. Versloot
  • A. Salmi
  • M. D. Hua
  • D. H. Howell
  • C. Giroud
  • V. Parail
  • G. Saibene
  • T. Tala

Research units

  • Dutch Institute for Fundamental Energy Research
  • Imperial College London
  • VTT Technical Research Centre of Finland


In this study, enhancement of the toroidal field (TF) ripple has been used as a tool in order to reveal the impact of the momentum pinch on the rotation profiles in H-mode JET discharges. The analysis showed that flatter rotation profiles were obtained in discharges with a high TF ripple, attributed to a smaller inward momentum convection. An average inward momentum pinch of approximately Vp ≈ 3.4 m s-1 and a normalized pinch value of RVp/χ ≈ 6.6 could explain the observation. The data show that the momentum at the edge affects the peaking of the rotation and momentum density profiles. Under the assumption that the heat and momentum diffusivities are equal, an estimate of the levels of the momentum pinch in all discharges in the JET rotation database was made. For H-mode discharge these ranged from 0.3 m s-1 < Vp < 17 m s-1, with 2 < RVp/χ < 10. A larger momentum pinch was found in discharges with a smaller density profile gradient length, i.e. a more peaked density profile.


Original languageEnglish
Article number065004
JournalPlasma Physics and Controlled Fusion
Issue number6
Publication statusPublished - 21 May 2010
MoE publication typeA1 Journal article-refereed
EventEuropean Physical Society Conference on Plasma Physics - Dublin, Ireland
Duration: 21 Jun 201025 Jun 2010
Conference number: 37

ID: 26682973