Abstract
The front-end system of rare isotope accelerator of newness (RAON) heavy-ion accelerator, which consists of an electron cyclotron resonance (ECR) ion source, a low energy beam transport (LEBT), a radio frequency quadrupole (RFQ) and a medium energy beam transport(MEBT), is now in the technical design phase to optimize and improve the optics. Especially, MEBT system is installed between the RFQ linac and the superconducting linac (SCL). It requires careful matching of the optical parameters in transverse plane and removes the unaccelerated ion beams from the RFQ linac. It also includes the beam diagnostic devices to measure the beam quality at the exit of the RFQ linac. Quadrupole magnets and normal-conducting re-bunchers are used to minimize the growths of the transverse and the longitudinal emittances. To remove the unaccelerated ion beams, we choose a normal-conducting quarter wave resonator (QWR) and designed it by using the Micro Wave Studio (MWS) code. The re-buncher has a maximum electric field of 2.95 MV/m on the cavity surface with an electric field of 1 MV/m on the beam axis, a geometrical beta factor of 0.025 and an effective length of 22 cm. Beam simulations shows that the beams from upstream of the LEBT and the RFQ can be transported by the MEBT without any increases in the beam emittances.
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