Stacked-ring ion guide for cooling and bunching rare isotopes

In modern rare isotope facilities, ion cooling and bunching lies at the heart of transfer along a low-energy beam line that consists several differential pumping stages. We present conceptual design an guide as alternative to conventional linear Radio-Frequency Quadrupole (RFQ) for isotopes. The is composed stacked ring electrodes varying apertures, which confining RF potential following rectangular waveform applied. thicknesses rings gaps in between are varied accordingly maximize volume reduce losses. Ion transport within facilitated by lower-frequency wave traveling on top higher-frequency field. former induced locally adjusting duty cycle potential. Design parameters first calculated analytical studies then optimized trajectory simulations with SIMION. results show enables high transmission produces well focused bunches. It will be used NEXT project, experimental study atomic masses Neutron-rich EXotic nuclei produced multi-nucleon Transfer reactions.