We report results of plasma confinement experiments with an auxiliary warm-plasma component flowing along magnetic field lines to suppress ion-cyclotron instabilities. The reduced plasma losses, with the lower fluctuation amplitude, permits neutral-beam build-up of a 13-keV deuterium plasma to densities as high as 4 ×{} 10¹³ cm^-3 corresponding to peak beta values of 0.4. Variation of the beam energy demonstrates that longer confinement times are achieved at higher ion energies.
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Coensgen et al. (1975) studied this question.
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