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The emittances of hydrogen and deuterium negative ion beams produced by volume ion sources have been measured in a transverse plane normal to the beam trajectory. The extraction voltage was varied from 10 to 40 kV, and the transverse magnetic field in the Penning discharges was varied from 0.1 to 0.2 T. Measurements were made on beams with current densities up to 60 mA/cm2 at Oak Ridge National Laboratory with an emittance scanner originally developed at Los Alamos National Laboratory. The beam profile at the scanner can be used to improve the accuracy of the emittance measurements. Other factors affecting emittance measurements are discussed. This analysis may be applicable to other ion sources.
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C. C. Tsai
M. A. Akerman
W.R. Becraft
Review of Scientific Instruments
Oak Ridge National Laboratory
Washington and Lee University
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Tsai et al. (Thu,) studied this question.
www.synapsesocial.com/papers/69e652bd2cf06798f413c6d4 — DOI: https://doi.org/10.1063/1.1141494