2.45 GHz ECR ion source and expected performance for polarized heavy ion source

Abstract

Abstract A single stage 2.45 GHz ECR (electron cyclotron resonance) ion source has been constructed as the first section of a polarized heavy ion source based on spin and charge exchange collisions. Performance of the ECR ion source measured for ionization of a 3 He gas has revealed a sizable difference in the behavior of yields for 3 He 2+ and 3 He + ions taken as a function of either a gas consumption rate or a microwave input power. More than 4 eμA 3 He 2+ ions have been extracted from the ion source. Possible performance for the polarized heavy ion source now under construction at the Research Center for Nuclear Physics (RCNP), Osaka University is discussed under the assumption of the present experimental results. It is anticipated that the 3 He 2+ current of ∼1 eμ A can be delivered with a polarization of about 0.1.