The impact of radial electric fields and plasma rotation on intermittence in TJ-II Articles uri icon

authors

  • VAN MILLIGEN, B.PH.
  • CARRERAS VERDAGUER, BENJAMIN A.
  • GARCIA GONZALO, LUIS
  • GRENFELL, G.
  • VOLDINER, I.
  • HIDALGO, CARLOS

publication date

  • May 2022

start page

  • 1

end page

  • 8

issue

  • 5

volume

  • 64

International Standard Serial Number (ISSN)

  • 0741-3335

Electronic International Standard Serial Number (EISSN)

  • 1361-6587

abstract

  • This work explores the impact of an imposed radial electric field on the intermittence parameter in magnetically confined plasmas. The intermittence is sensitive to both the magnetic configuration (dominant helical modes or low order rational surfaces) and to poloidal flows or radial electric fields. This behaviour was verified both in numerical turbulence calculations using a resistive magnetohydrodynamic model, and using Langmuir probe data obtained in experiments at the TJ-II stellarator. It is shown that the intermittence parameter can be used to detect when the local plasma rotation velocity, with respect to the laboratory frame of reference, is minimum.

subjects

  • Physics

keywords

  • turbulence; intermittence; stellarator; plasma flow