Abstract
The neutral beam sciopticon (pinhole camera) has been expanded to an array of pinhole apertures in order to simplify the process of distinguishing between beam imperfections caused by extraction nonuniformities and those caused by beamlet missteering. An analysis scheme is presented whereby the power transmission loss due to beamlet missteering may be estimated if the average beamlet divergence anlge is known. For a well-focused ion source, the sciopticon array can also give the approximate beam focal length and average beamlet divergence angle. Results from testing five ORNL ion sources indicate that the principal mechanism for differences in power transmission is beamlet missteering.
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