ECR离子源金属离子的产生

Production of Metallic Ions Beam in ECR Ion Source

讨论了ECR离子源金属供料方法 ,在 1 4 5GHzECR离子源上应用炉子加热和MIVOC法获得了 40 Ca11+1 40eμA和5 6 Fe10 +65eμA 。

The production of metallic ion beam by means of many methods in high charge state ECR (Electron Cyclotron Resonance) ion source is reviewed. A small evaporation oven with external diameter 8 mm and length 70 mm was tested for metallic ion beam production. The small oven could reach more than 1300℃ with 110W electric power. 140eμA of Ca 11+ and 70eμA of Ca 12+ beams were achieved on the 14.5 GHz ECR at 1MP ion source by using the oven. The Ca 11+ beam had been provided to the IMP cyclotron for three weeks with a good stability. In order to obtain intense metallic ion beam, MIVOC (Metallic Ion from VOlatile Compound) method was tested successfully on the 14.5 GHz ECR ion source. 65eμA of Fe 10+ by MIVOC method was obtained. During running of the ion source with Ca 11+ , the oven temperature was not controlled easily by changing the electric power because of extra heating by microwave which was already tested. So a new type of oven was designed in order to avoid this problem. MIVOC method is easy to be performed and beam intensity is high, but it is only suitable for a few metallic elements, on the other hand, the vacuum chamber of the ion source could be seriously contaminated if the ion source runs for a long time.