Turbulent Plasma Heating in a Torus

Abstract

Turbulent heating has been applied to plasmas of density ${10}^{11}$ to 5 × ${10}^{13}$ ${\mathrm{cm}}^{-3\mathrm{}}$ in a bumpy torus for the purpose of observing afterglow confinement. An rf electric field of up to 250 V/cm ringing at 1 Mc/sec was induced parallel to the axis for 1 μsec. The plasma was observed to remain in confinement for several microseconds after current cutoff, the initial $\mathrm{nT}$ being as high as (5-7) × ${10}^{15}$ eV ${\mathrm{cm}}^{-3\mathrm{}}$.