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Yamada, S.

Paper Title Page
MOP028 Creation of Peaks in the Energy Spectrum of Laser-Produced Ions by Phase Rotation 97
 
  • A. Noda, H. Itoh, Y. Iwashita, S. Nakamura, T. Shirai, H. Souda, M. Tanabe, H. Tongu, A. Yamazaki
    Kyoto ICR, Uji, Kyoto
  • S. Bulanov, T. Kimura, A. Nagashima
    JAEA, Ibaraki-ken
  • H. Daido, Y. Hayashi, M. Kado, M. Mori, M. Nishiuchi, K. Ogura, S. Orimo, A. Sagisaka, A. Yogo
    JAEA/Kansai, Kizu-machi Souraku-gun Kyoto-fu
  • A. Fukumi, Z. Li, S. Yamada
    NIRS, Chiba-shi
  • T. Tajima
    JAEA/FEL, Ibaraki-ken
  
  Efficient acceleration of ions with use of very high electromagnetic field created by a high power laser has been paid attention because of its attainable very high acceleration gradient. Its intensity, however, has exponentially decreases according to the increase of its energy, which causes essential difficulty for its real application. For the quality improvement of laser-produced ions in their energy spreads, a scheme to apply an additional RF electric field synchronous to the pulse laser, called “Phase Rotation”,* has been applied to the ions produced from the thin foil target 3 and 5 mm, in thickness by irradiation of focused Ti:Sapphire laser with the wave length of 800 nm after optimization of the ion production process with use of real time observation of ion energy by TOF measurement.** Energy peaks with the spread of 7 % have been created in the energy spectrum at the positions depending on the relative phase between the pulse laser and the RF electric field. Possible application of “Phase Rotated” laser-produced ion beam is also to be discussed.

* A. Noda et al., Laser Physics, Vol. 16, No.4, pp.647-653(2006).
** S. Nakamura et al., to be submitted to Jpn. J. Appl. Phys.

 
MOP042 Performance of Alternating-Phase-Focused IH-DTL 136
 
  • 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
  
  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.