Description: A large source employing a magnetic bucket geometry with a large curved converter surface focused on a single slit extractor is presently being studied at LBL. In order to understand the relationships among the Cs coverage, the high energy (back-scattered) and low energy (desorbed) H/sup -/ beams and the angular and energy distributions of the beams, we have constructed a small version of the LBL source in which the work function of the converter, which is immersed in the plasma (n < 10/sup 11//cm/sup 3/), can be measured by photo emission while the other parameters are varied. In addition, the converter can be rotated and the H/sup -/ beam collimated and analyzed to give a complete energy and angular spectrum.
Date: November 1, 1983
Creator: Wada, M.; Pyle, R.V. & Stearns, J.W.
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