Abstract
Ion-beamlet structures were studied experimentally to e nd the conditions for which ion beamlets had noncircular proe les. Seven or less ion beamlets were extracted from a discharge chamber using a multiplecircular-hole ion-extraction system that was composed of a pair of screen and accelerator grids. A beam separator was employed to eliminate all but one ion beamlet. The isolated ion beamlet was observed three dimensionally using arrayed Faraday probes, which showed that the ion-beamlet proe les were distorted hex-symmetrically under certain conditions. To measure the degree of distortion a distortion factor was introduced. The ion beamlet was generally a superposition of a circular-proe led beamlet consisting of the major part of the ions and a distorted-proe led beamlet consisting of the minor part of the ions. Attempts to demonstrate the hex-symmetrical proe le computationally using a conventional three-dimensional numerical ion-extraction model that assumed a constant ion density over all of the ion-trajectory origins failed, but the results indicate that inclusion of nonuniform ion production would solve the problem.
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