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- Y. Iwata, T. Fujisawa, S. H. Hojo, N. M. Miyahara, T. Murakami, M. Muramatsu, 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
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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 designed a compact injector system consisting of RFQ and Interdigital H-mode DTL (IH-DTL) having the frequency of 200 MHz. For the beam focusing of IH-DTL, the method of Alternating-Phase-Focusing (APF) was employed. By using APF, no focusing element in the cavity, such as quadrupole magnets, is needed. Having employed APF IH-DTL, the injector system is compact; the total length of two linacs is less than 6m. The injector system can accelerate carbon ions up to 4.0 AMeV. The construction and installation of RFQ and APF IH-DTL has completed, and the beam tests were performed. We succeeded to accelerate carbon ions with satisfactory beam intensity and emittances. The design and performance of RFQ and APF IH-DTL will be presented.
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