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Iga, T.

Paper Title Page
TUPLS094 Development of a Permanent Magnet Microwave Ion Source for Medical Accelerators 1723
 
  • S. Hara, T. Iga, M. Tanaka
    Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken
 
  A permanent magnet microwave ion source was developed to improve availability of proton accelerator application systems based on industrial microwave ion source technologies. The ion source needs no filament in the discharge chamber, which leads to reliability improvement and less maintenance time. Because the ion source uses a permanent magnet, the ion source needs no coils, no coil power and no coil coolant. The hydrogen beam of over 60 mA has been extracted from a single 5mm diameter aperture with a proton fraction of 85% at a microwave power of 1.3kW. Rise times of the microwave power and beam current to 90 % of the final value were about 30 and 100μseconds respectively at a pulse operation mode with 400μseconds pulse width and 20 Hz repetition rate. These performance parameters are equal to the solenoid coil ion source parameters, making the ion source desirable for accelerator applications like proton therapy systems.