Abstract
We present measurements on the focusing properties of four different types of electrostatic quadrupole lenses. Among these are lenses with asymmetric electrode ends. The effective electrode length and the useful aperture radius are determined at various values of the aspect ratio. Based on these results it is estimated that the limiting current for a transport channel employing quadrupoles with an aspect ratio of 0.3 is a factor of 2.7 smaller than for a channel employing quadrupoles with an aspect ratio of 0.6 Furthermore, asymmetric electrodes yield somewhat smaller limiting currents than conventional electrodes. This is investigated for an aspect ratio of the order of 0.3. Quadrupole channels in which these electrodes are employed can be stacked at a twice higher density than conventional channels, while the mechanical construction is less complex. This makes asymmetric electrodes good candidates for use in multichannel accelerators.
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