Effect of magnetic-field configuration on the beam intensity from electron cyclotron resonance ion source and RIKEN superconducting electron cyclotron resonance ion source

We measured the main plasma parameters (density of electron, temperature of electrons, and ion confinement time) as a function of B-min and B-inj with laser ablation technique. We observed that the Bmin mainly affects the temperature and density of electrons and all of the three parameters increase with increasing the Binj. We also observed that the gas pressure of the plasma chamber at the rf injection side became minimum at the optimum value for Bmin at fixed gas flow. This result indicates that the ionization efficiency becomes maximum at optimum value for B-min. From these results, it is concluded that the plasma production is strongly dependent on the Bmin (plasma generator). We also observed that the B-inj affects the ion confinement time, temperature, and density of electrons. All of the three parameters increase with increasing B-inj. (c) 2006 American Institute of Physics.