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VOLUME 59 (1994) | ISSUE 10 | PAGE 651
Improved confinement by lower-hybrid heating in the FT-2 tokamak
A transition to a regime of improved confinement has been seen, for the first time, in experiments involving lower-hybrid heating, in which there is a substantial heating of ions and electrons at sufficiently high densities. The improvement in confinement occurs after the rf heating pulse. A slowing of the recycling of hydrogen at the periphery of the discharge and a broadening of the current-density profile play important roles here.