Abstract
A low-energy, large-current ion beam was produced. The hydrogen plasma of 10/sup 12//cm/sup 3/ and the argon plasma of 10/sup 13//cm/sup 3/ were produced in a glow discharge. The ion beam was withdrawn through a multiaperture electrode with 400 apertures. The low-energy ion acceleration was very efficient at the value of ..gamma../d larger than 0.4, which was obtained by the calculation for 20 eV energy. The low-energy ion beam diverges at high plasma density and the ion current decreases. The maximum effective current is 135 mA, energy is 500 to 1000 eV, the beam diameter is 4 cm and the effective ion efficiency is 85 to 90 percent for hydrogen plasma. The maximum effective current is 160 mA, energy is 500 eV, the beam diameter is 4 cm, the efficiency is 80 to 90 percent and the propulsion is 300 mg for argon plasma. (MOW)
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