Abstract
In order to realize new investigations on physics, biology, and other fields, a metallic ion beam is quite effective and essential. To produce the metallic ion beam in an electron cyclotron resonance (ECR) ion source, how to supply the metallic gas into the ECR plasma is most important. At present, the NIRS-HEC, which is an 18 GHz ECR ion source installed for the Heavy Ion Medical Accelerator in Chiba at the National Institute of Radiological Sciences (NIRS), enables us to produce a stable Fe9+ beam of 180 eμA by the metal ions from volatile compounds technique. In addition, the development of a new gas supply method, using the electron-bombardment technique, is in progress. In this method, the tip of a metal target rod (2–6 mm diameter) at a high positive potential is melted by bombarding the thermoelectrons emitted from a surrounding hot filament and the evaporated gas is supplied into the ECR plasma.
Published Version
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