The effect of lower hybrid waves on JET plasma rotation

M. F.F. Nave, K. Kirov, J. Bernardo, M. Brix, J. Ferreira, C. Giroud, N. Hawkes, T. Hellsten, T. Jonsson, J. Mailloux, J. Ongena, F. Parra

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


This paper reports on observations of rotation in JET plasmas with lower hybrid current drive. Lower hybrid (LH) has a clear impact on rotation. The changes in core rotation can be either in the co- or counter-current directions. Experimental features that could determine the direction of rotation were investigated. Changes from co- to counter-rotation as the q-profile evolves from above unity to below unity suggests that magnetic shear could be important. However, LH can drive either co- or counter-rotation in discharges with similar magnetic shear and at the same plasma current. It is not clear if a slightly lower density is significant. A power scan at fixed density, shows a lower hybrid power threshold around 3 MW. For smaller LH powers, counter rotation increases with power, while for larger powers a trend towards co-rotation is found. The estimated counter-torque from the LH waves, would not explain the observed angular frequencies, neither would it explain the observation of co-rotation.

Original languageEnglish (US)
Article number034002
JournalNuclear Fusion
Issue number3
StatePublished - Mar 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


  • current drive
  • lower hybrid
  • rotation
  • tokamak


Dive into the research topics of 'The effect of lower hybrid waves on JET plasma rotation'. Together they form a unique fingerprint.

Cite this