Ion-Bernstein-wave heating and improved confinement in the Alcator C tokamak.
Plasma heating by directly launched ion Bernstein waves is investigated in the Alcator C tokamak at densities n-bar/sub e/approx. >1 x 10/sup 20/ m/sup -3/. For injected rf powers P/sub rf/approx. 2 x 10/sup 20/ m/sup -3/), the heating ceases to be efficient.