Boundary plasma of a circular tokamak has been investigated by means of electrostatic probes during lower-hybrid heating. The reflection coefficient is affected by the density gradient in front of the launcher. An effective ion heating is performed in the main plasma region when the boundary electron temperature is relatively high enough to suppress the parametric decay instabilities.The simultaneous injection of neutral beams as well as the lower-hybrid wave brings the suppressionof instabilities with increase of the electron temperature coming from the neutral beam heating.
ASJC Scopus subject areas
- Physics and Astronomy(all)