1. Fluctuations and transport due to ion-temperature-gradient-driven instabilities
- Author
-
J.M. Dawson, T. S. Hahm, W. W. Lee, and R.D. Sydora
- Subjects
Physics ,Temperature gradient ,Condensed matter physics ,Heat flux ,Physics::Plasma Physics ,General Physics and Astronomy ,Plasma ,Electric potential ,Electrostatics ,Saturation (magnetic) ,Molecular physics ,Spectral line ,Magnetic field - Abstract
The nonlinear evolution and spectral properties of ion temperature gradient-driven modes in a three-dimensional sheared magnetic field with multiple rational surfaces have been investigated using gyrokinetic plasma simulation techniques. A detailed study of the electrostatic potential fluctuation spectra shows that it is dominated by the modes with moderate poloidal wavelength (0.1{le}{ital k}{sub {ital y}}{rho}{sub {ital s}}{le}0.5). The measured thermal flux in the steady state, which is lower than the quasilinear value at saturation, is found to decrease weakly with an increase in the magnetic shear strength.
- Published
- 1990