CYCLOTRON DEVELOPMENT PROGRAM AT JYVAESKYLAE

摘要

The Jyvaeskylae K130 cyclotron has been modified to allow also negative ion acceleration with stripping extraction. A multi-cusp ion source for negative ions (H~- and d~-) was built. The source gives over 5 mA at a voltage of 5.9 kV, which is used for 30 MeV protons. The extracted 30 MeV proton beam of 60 μA from the cyclotron has been reached. Due to very good extraction efficiency the dose rate in the cyclotron vault has decreased by a factor of 10-20 with 30 MeV protons compared to positive ion extraction. Also the inflector change was automated in order to reduce the dose for personnel.