An easily constructed alkali-metal-ion gun with a large metal-zeolite reservoir is described. The gun provides ion-beam currents from 100 eV to 5 keV in excess of 10 μA with a wide range of focal lengths. The ion trajectories of the extraction, acceleration, and focusing have been computed using the program simion. A versatile three-electrode extraction geometry that provides ion trajectories which emulate the planar diode is described.
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