Speaker
Description
To meet the beam requirements of High Intensity
heavy ion Accelerator Facility (HIAF), the Institute of
Modern Physics is developing a Fourth generation
ECR ion source (FECR). Targeting at the operation
frequency of 45 GHz, FECR is expected to produce
very high intensity highly charged heavy ion beams,
such as 1.0 emA 238U35+, 2 emA 78Kr19+, 10 emA
16O6+, etc. Based on the records with the 3rd
generation ECR ion source operating at 24~28 GHz,
the corresponding total drain current of FECR could
reach 20 ~ 60 emA. To extract such high intensity
multi-charged ion beams from the source with high
beam quality and transmission efficiency,
conventional diode or triode extraction system might
not be suitable, and therefore a 4-electrode
extraction system with a total extraction voltage of
50 kV is designed to mitigate the space charge
influences and minimize the beam emittance growth
in the extraction region. In this paper, a 3D model of
the FECR extraction system is built using the IBSimu
code. The electrode angles, voltages and electrode
spacings are optimized for different ion beam
conditions respectively. Beam properties comparison
of various simulation conditions are presented.