Abstract
Beams of energetic atoms were injected to heat the plasma contained in the Princeton Large Torus tokamak. The plasma reached ion temperatures of about 6.5 kiloelectron volts (≈ 75 million K) and electron temperatures of about 4.0 kiloelectron volts or greater (≈ 46 million K)—both the highest yet achieved in a tokamak device. Although a new type of density fluctuation in the plasma was observed at the highest injection powers and lowest plasma densities, the energy confinement properties of the discharge did not appear to deteriorate even at the low collisionalities relevant to a thermonuclear reactor plasma. The electron energy confinement in the central plasma appeared to be enhanced during beam injection.
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