Published October 9, 2013
| Version v1
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EFD-P(13)59 Effects of Magnetic Shear on Toroidal Rotation in Tokamak Plasmas with LHCD
Creators
- J.E. Rice
- Y.A. Podpaly
- M.L. Reinke
- R. Mumgaard
- S.D. Scott
- S. Shiraiwa
- G.M. Wallace
- B. Chouli
- C. Fenzi-Bonizec
- M.F.F. Nave
- P.H. Diamond
- C. Gao
- J.W. Hughes
- P.T. Bonoli
- L. Delgado-Aparicio
- L.-G. Eriksson
- C. Giroud
- R.S. Granetz
- M.J. Greenwald
- A.E. Hubbard
- I.H. Hutchinson
- J.H. Irby
- K. Kirov
- J. Mailloux
- E.S. Marmar
- R.R. Parker
- S.M. Wolfe
- JET EFDA contributors
Description
Application of lower hybrid current drive (LHCD) in tokamak plasmas can induce both co- and counter-current directed changes in toroidal rotation, depending on the core magnetic shear, s. For discharges with s > 1, rotation increments in the countercurrent direction are observed. If the LH driven current is sufficient to suppress sawteeth and reduce the central s below unity, the core toroidal rotation change is in the co-current direction. This change in sign of the rotation increment is consistent with a change in sign of the residual stress (the divergence of which constitutes an intrinsic torque that drives the flow) through its dependance on s.