The Effect of an Electrode in the First Stage of RIKEN Electron Cyclotron Resonance Ion Source (ECRIS)

Abstract

The beam intensity of argon ions was measured when an electrode was used in the first stage of a RIKEN Electron Cyclotron Resonance Ion Source (ECRIS). The enhancement of higher charge state performance was observed when we used the electrode. The beam intensity is strongly dependent on the bias voltage of the electrode. We also observed that larger current of higher-charge-state ions can be obtained when we used the electrode after coating the chamber wall with Al 2 O 3 .