Abstract
Energy distributions of ions emanating from high-current, xenon hollow cathodes were measured using an electrostatic energy analyzer. Ions with energies much greater thanmaximumpotential differences between electrodes were observed. This result is consistent with previous retarding-potential-analyzer data, but the electrostaticenergy-analyzer data show much more complicated structures. To characterize these distributions, they were t with simple Gaussian functions, and the effects of discharge conditions on high-energy-ion characteristics were investigated. The energy of ions emanating from cathodes appears to increase as discharge current is increased or cathode ow rate is reduced. Higher discharge currents cause the ion populations in the high-energy tails of the distributions to increase in the plume mode while the high-energy tails decrease in the spot mode.
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