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Hojo, S. H.

Paper Title Page
WEPCH169 Alternating Phase Focused IH-DTL for Heavy-ion Medical Accelerators 2328
 
  • Y. Iwata, T. Fujisawa, T. Furukawa, S. H. Hojo, M. Kanazawa, N. M. Miyahara, T. Murakami, M. Muramatsu, K. Noda, H. Ogawa, Y. S. Sakamoto, S. Yamada, K. Yamamoto
    NIRS, Chiba-shi
  • T. Fujimoto, T. Takeuchi
    AEC, Chiba
  • T. Mitsumoto, H. Tsutsui, T. Ueda, T. Watanabe
    SHI, Tokyo
 
  Tumor therapy using HIMAC has been performed at NIRS since June 1994. With the successful clinical results over more than ten years, a number of projects to construct these complexes have been proposed over the world. Since existing heavy-ion linacs are large in size, the development of compact linacs would play a key role in designing compact and cost-effective complexes. Therefore, we developed an injector system consisting of RFQ and Interdigital H-mode (IH) DTL having the frequency of 200 MHz. The injector system can accelerate carbon ions up to 4.0 AMeV. For the beam focusing of IH-DTL, the method of Alternating Phase Focusing (APF) was employed. With the IH structure and rather high frequency, the cavity size is compact; the radius is 0.4 m, and lengths of RFQ and IH-DTL are 2.5m and 3.5m respectively. The fabrication of RFQ was completed, and we succeeded to accelerate carbon ions with satisfactory performances. For IH-DTL, the full-scale model was first fabricated. With the encouraging result* of its electric field measurement, we constructed IH-DTL and beam acceleration tests will be performed in March 2006. We will present the performances of the entire injector system.

*Y. Iwata et al., Nucl Instr. & Meth in Phys. Res. A (submitted).