Author: Lee, B.S.
Paper Title Page
TUPPD042 Design of Transmission Line at 28 GHz, 10 kW for ECR Ion Source in KBSI 1494
  • M. Won, S. Choi, B.C. Kim, B.S. Lee, J.W. Ok, J.Y. Park, J.H. Yoon
    Korea Basic Science Institute, Busan, Republic of Korea
  The 28 GHz gyrotron system was designed to deliver the microwave power from gyrotron oscillator to an electron cyclotron resonance ion source (ECRIS) for simultaneously producing high current and highly charged ions. The microwave power from 28 GHz gyrotron were measured from the range between 0.5 kW and 10 kW with frequency variation from 27.9740 to 27.9893 GHz. The gyrotron oscillator of transmission system operates in continuous wave regime with the smoothly regulated output microwave power. A transmission line was designed for the transport of microwaves to an ion source. For the electrical insulation between gyrotron system and ion source chamber applied to high voltage, we installed a DC break. In order to evaluate gyrotron operation, a dummy load was developed to consume such high microwave power.  
THPPP042 The First Step of RFQ Development in KBSI 3829
  • J.W. Ok, S. Choi, B.C. Kim, B.S. Lee, J.Y. Park, M. Won, J.H. Yoon
    Korea Basic Science Institute, Busan, Republic of Korea
  The RFQ for accelerating an ion beam is being developed in Korea Basic Science Institute (KBSI). The KBSI RFQ is designed to accelerate 1 mA lithium beam (Q/A=3/7) at 88 MHz. It is considered to be a 4-vane RFQ structure. The injection beam energy into RFQ is 12 keV/u, the output beam energy downstream from RFQ is 300 keV/u. The RFQ has to show stable operation, meet availability, and have the minimum losses so as to guarantee the best performance/cost ratio. At the first step, two dimensional geometry structure was studied using SUPERFISH code for the resonance frequency of quadrupole and dipole modes. Three dimensional field distributions were investigated by CST microwave studio. The beam dynamics in RFQ accelerator were studied using PARMTEQM code. Based on these results, the structural analysis should be studied and a cold model will be fabricated and investigated. The practical KBSI RFQ will be manufactured in next year.