Results Of Riken Superconducting Electron Cyclotron Resonance Ion Source With 28 Ghz

We measured the beam intensity of highly charged heavy ions and x-ray heat load for RIKEN superconducting electron cyclotron resonance ion source with 28 GHz microwaves under the various conditions. The beam intensity of Xe20+ became maximum at B-min similar to 0.65 T, which was similar to 65% of the magnetic field strength of electron cyclotron resonance (B-ECR) for 28 GHz microwaves. We observed that the heat load of x-ray increased with decreasing gas pressure and field gradient at resonance zone. It seems that the beam intensity of highly charged heavy ions with 28 GHz is higher than that with 18 GHz at same RF power. (C) 2012 American Institute of Physics. [doi:10.1063/1.3660821]