Studies on low energy beam transport for high intensity high charged ions at IMP

Abstract

Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou (SECRAL) is an advanced fully superconducting ECR ion source at IMP designed to be operational at the microwave frequency of 18-24 GHz. The existing SECRAL beam transmission line is composed of a solenoid lens and a 110° analyzing magnet. Simulations of particle tracking with 3D space charge effect and realistic 3D magnetic fields through the line were performed using particle-in-cell code. The results of the beam dynamics show that such a low energy beam is very sensitive to the space charge effect and significantly suffers from the second-order aberration of the analyzing magnet resulting in large emittance. However, the second-order aberration could be reduced by adding compensating sextupole components in the beam line. On this basis, a new 110° analyzing magnet with relatively larger acceptance and smaller aberration is designed and will be used in the design of low energy beam transport line for a new superconducting ECR ion source SECRAL-II. The features of the analyzer and the corresponding beam trajectory calculation will be detailed and discussed in this paper.

Heavy ion beam physics at Facility for Rare Isotope Beams

“…The LEBT is a rather complicated optical system consisting of solenoids, bending magnets, electrostatic quadrupoles, and dipoles. Detailed beam dynamics studies in the LEBT were reported 2020 JINST 15 P12034 elsewhere [9,10]. The performance of the FRIB Front End (FE) per project specifications was successfully demonstrated shortly after the first beam commissioning started as reported in ref.…”