A 2.45 GHZ ECR ION-SOURCE FOR PRODUCTION OF MEDIUM CHARGE STATES IONS

At the Lawrence Berkeley National Laboratory we are constructing an EC R ion source test facility for nuclear science as well as industrial a pplications experiments. For these purposes, a single-stage 2.45 GHz e lectron cyclotron resonance ion source has been designed and construct ed. It features an axial magnetic field with a mirror ratio of up to s ix and a hexapole field produced by a simple Nd-Fe-B permanent magnet assembly. In order to enhance the ion confinement time, the source pla sma volume has been enlarged as much as possible while still maintaini ng a high mirror ratio. This paper describes the design of the ion sou rce, the extraction system and the test stand. First, operational expe rience and experimental results with an argon discharge are presented. (C) 1998 American Institute of Physics.