Ion Sources for the Production of Low Energy Beams.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Three ion sources for the production of low energy E500 eV ion beams have been constructed and tested for use in atomic scattering experiments. Design parameters are given for construction and operation of the sources. Two gas sources, a duoplasmatron and an electron impact source, are capable of delivering beams of H, H2, H3, He, N, and N2, as well as other gas-derived ions, with beam intensities measured at a detector 75 cm downstream of approx. 0.2 microamperessq cm. Beam currents closely parallel Langmuir-Child space charge limited intensities. For the duoplasmatron, a full-width energy dispersion of 2-3 of the beam energy is observed. With hydrogen gas, beam composition of 34 H, 42 H2, and 24 H3 was achieved. Both gas sources require externally heated cathodes. The third source is a thermal device which produces lithium ion beams of approx. 0.1 microamperessq cm at a detector 75 cm away. The beam energy spread is a few tenths of an eV. Author
- Particle Accelerators