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Abstract:
The ECR ion source DECRIS-4 has been designed and constructed at the FLNR JINR to be used as a second injector of heavy multiply charged ions for the U-400 cyclotron. The design of the magnetic structure of the source was based on the idea of the so-called "magnetic plateau". The axial magnetic field is formed by three independent solenoids enclosed in separated iron yokes. As a result the superposition of the coils and hexapole magnetic fields creates the enlarged resonance volume. The first experiments showed that the source was able to produce more than 300eμA of Ar8+ when only 100W of microwave power was used. During the last experiment almost 500eμA of Ar8+ was extracted with the same power. In this paper we will present the preliminary results with other gaseous ions, such as oxygen, krypton and xenon.
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