Abstract
A compact 65 keV ion gun for stable alkali ions, based on a zeolite-type surface ionization source, has been developed for use in radioactive beam experiments at ISOLDE at CERN. The design procedures are presented as well as the results of tests on the prototype. While intended to provide beams of typically 1 nA, beams of up to 50 nA have been produced for short times. Beams of average current 500 pA have been supplied from a single charge of zeolite for up to 90 days. The gun can deliver a beam of less than 6 mm diameter (FWHM) at a distance of 500 mm. The theory of the relationship of the beam emittance to the ion source size and temperature for such a gun is presented. Based on this theory and measurements of the beam profile, the emittance of the gun for cesium ions at an energy of 50 keV is estimated to be 1.3 π mm mrad.
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