Author: Yumoto, K.U.
Paper Title Page
MO3PB02 Design Study of a Superconducting AVF Cyclotron for Proton Therapy 102
  • H. Tsutsui, A. Hashimoto, Y. Mikami, H. Mitsubori, T. Mitsumoto, Y. Touchi, T. Ueda, K. Uno, K. Watazawa, S. Yajima, J.Y. Yoshida, K.U. Yumoto
    SHI, Tokyo, Japan
  Since a cyclotron has better beam quality than that of a synchrocyclotron, we have designed a 4 Tesla superconducting AVF cyclotron for proton therapy. Its weight is less than 60 tons, which is about one fourth of our normal conducting 230 MeV cyclotron. In order to reduce the size and the weight without deteriorating the beam stability, the hill gap around the outer pole radius is made small. Calculated extraction efficiency is higher than 60%, by arranging the extraction elements properly. The low temperature superconducting coil using NbTi wire is conduction-cooled by 4K GM cryocooler. Three dimensional electromagnetic finite element codes have been used during all phases of basic design.  
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