• D.G. Kim, H.-C. Bhang, J.Y. Kim
  SNU, Seoul
• J.-W. Kim
  NCC, Korea, Kyonggi
• C.C. Yun
  Chung-Ang University, Seoul

Accelerator mass spectrometry (AMS) using a cyclotron has been studied because the system can be more compact and economical compared to the widespread commercial Tandem AMS. However, the previous efforts to build such a system showed that it has weakness in stability and transmission efficiency. To increase transmission efficiency it is important for the injection system to match not only the transverse phase space of a beam but also the longitudinal phase space with cyclotron acceptance. We plan to adopt a sawtooth RF buncher to increase transmission efficiency in the acceleration region of the cyclotron and a radial injection beam line. A goal in designing the injection line is to minimize the number of beam line elements to keep the system compact. The design of the injection system was carried out using the codes such as TRANSPORT and TRACE-3D. A prototype of the injection system is being constructed, and some results will be presented.