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

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

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

Organisaatiot

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

Kuvaus

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.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli065004
JulkaisuPlasma Physics and Controlled Fusion
Vuosikerta52
Numero6
TilaJulkaistu - 21 toukokuuta 2010
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu
TapahtumaEuropean Physical Society Conference on Plasma Physics - Dublin, Irlanti
Kesto: 21 kesäkuuta 201025 kesäkuuta 2010
Konferenssinumero: 37

ID: 26682973