Radio-frequency quadrupole

A Radio-Frequency Quadrupole (RFQ) is a type of particle accelerator that uses oscillating electromagnetic fields to focus and accelerate charged particles, typically ions. RFQs are particularly useful in the acceleration of low-energy ion beams and serve as the initial stage in a larger accelerator system, such as linear accelerators or synchrotrons. **Key features of an RFQ include:** 1.