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In modern rare isotope facilities, ion cooling and bunching lies at the heartof the ion transfer along a low-energy beam line that consists of severaldifferential pumping stages. We present a conceptual design of an ion guide asan alternative to the conventional linear Radio-Frequency Quadrupole (RFQ) forcooling and bunching rare isotopes. The ion guide is composed of stacked ringelectrodes of varying apertures, to which a confining RF potential following arectangular waveform is applied. The thicknesses of the rings and the gaps inbetween are varied accordingly to maximize the confining volume and to reduceion losses. Ion transport within the ion guide is facilitated by alower-frequency wave traveling on top of the higher-frequency confining field.The former is induced by locally adjusting the duty cycle of the rectangularwaveform of the confining potential. Design parameters are first calculated byanalytical studies and then optimized by ion trajectory simulations withSIMION. The results show that the ion guide enables high ion transmission andproduces well focused ion bunches. It will be used in the NEXT project, anexperimental study of atomic masses of Neutron-rich EXotic nuclei produced inmulti-nucleon Transfer reactions.

Stacked-Ring Ion Guide for Cooling and Bunching Rare Isotopes