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Noda, K.

 
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MOPCH088 Ion Cooler Storage Ring, S-LSR 237
 
  • A. Noda, S. Fujimoto, M. Ikegami, T. Shirai, H. Souda, M. Tanabe, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • H. Fadil, M. Grieser
    MPI-K, Heidelberg
  • T. Fujimoto, S.I. Iwata, S. Shibuya
    AEC, Chiba
  • I.N. Meshkov, I.A. Seleznev, A.V. Smirnov, E. Syresin
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
  
  Ion cooler and storage ring, S-LSR has been constructed. Its beam commissioning has been successfully performed since October, 2005 and electron beam cooling for 7 MeV proton beam has been performed with both flat and hollow spatial distributions. Effect of relative velocity sweep between electron and ion beams on the cooling time* has been confirmed. Based on the success to create the peaks in the energy spectrum of laser-produced ions, injection of laser-produced ions into S-LSR after rotation in the longitudinal phase space by an RF cavity synchronized to the pulse laser is under planning in order to apply electron cooling for such real laser produced hot ions. Three dimensional laser cooling satisfying the condition of 'tapered cooling' is also under investigation. 24Mg+ ions are to be laser-cooled only in the 'Wien Filter' in order to be cooled down to the appropriate energy according to their horizontal positions**. In parallel with the computer simulation, construction of the laser cooling system with use of ring dye laser accompanied with the second harmonics generator is now underway.

*H. Fadil et al. Nucl. Instr. & Meth. in Phys. Res. A517, 1-8 (2004).**A. Noda and M. Grieser, Beam Science and Technology, 9, 12-15 (2005).

 
TUOAFI01 Development for New Carbon Cancer-therapy Facility and Future Plan of HIMAC 955
 
  • K. Noda, T. Fujisawa, T. Furukawa, Y. Iwata, T. Kanai, M. Kanazawa, N. Kanematsu, A. Kitagawa, Y. Kobayashi, M. Komori, S. Minohara, T. Murakami, M. Muramatsu, S. Sato, E. Takada, M. Torikoshi, S. Yamada, K. Yoshida
    NIRS, Chiba-shi
  • C. Kobayashi, S. Shibuya, O. Takahashi, H. Tsubuku
    AEC, Chiba
  • Y. Sato, M. Tashiro, K. Yusa
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma
  
  The first clinical trial with carbon beams generated from the HIMAC was conducted in June 1994. The total number of patients treated is now in excess of 2500 as of December 2005. Based on our 10 years of experience with the HIMAC, we have proposed a new carbon-ion therapy facility for widespread use in Japan. The key technologies of the accelerator and irradiation systems for the new facility have been developed since April 2004. The new carbon-therapy facility will be constructed at Gunma University from April 2006. As our future plan for the HIMAC, further, a new treatment facility will be constructed at NIRS from April 2006. The design work has already been initiated and will lead to the further development of the therapy with the HIMAC. The facility is connected with the HIMAC accelerator complex and has two treatment rooms with horizontal and a vertical beam-delivery systems and one room with a rotating gantry. We will report the development for new carbon therapy facility and the design study for new treatment facility with the HIMAC.  
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TUPLS064 Design and Commissioning of a Compact Electron Cooler for the S-LSR 1639
 
  • H. Fadil, S. Fujimoto, A. Noda, T. Shirai, H. Souda, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • T. Fujimoto, S.I. Iwata, S. Shibuya
    AEC, Chiba
  • M. Grieser
    MPI-K, Heidelberg
  • K. Noda
    NIRS, Chiba-shi
  • I.A. Seleznev, E. Syresin
    JINR, Dubna, Moscow Region
  
  The ion cooler ring S-LSR has been constructed and commissioned in October 2005. The ring successfully stored a 7 MeV proton beam. The S-LSR is equipped with a compact-electron cooler which has a cooling solenoid length of 0.8 m, a toroid bending radius of 0.25 m and maximum magnetic field in the cooling section of 0.5 kG. The commissioning of the electron cooler was carried out with successful observation of both longitudinal and horizontal cooling of the proton beam. By varying the electric potential on the Pierce electrode in the gun, we have investigated the possibility of generating a hollow shaped electron beam, and studied its effect on the electron cooling process. Also the effect of the electrostatic deflector, installed in the toroid section in order to compensate the drift motion of the secondary electrons, was investigated. The design and results of the commissioning of the compact electron cooler are presented.  
TUPLS065 Beam Commissioning of Ion Cooler Ring, S-LSR 1642
 
  • T. Shirai, S. Fujimoto, M. Ikegami, A. Noda, H. Souda, M. Tanabe, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • H. Fadil
    MPI-K, Heidelberg
  • T. Fujimoto, H. Fujiwara, S.I. Iwata, S. Shibuya
    AEC, Chiba
  • I.N. Meshkov, I.A. Seleznev, A.V. Smirnov, E. Syresin
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
  
  S-LSR is a new ion cooler ring constructed in Kyoto University. The circumference is 22.557 m and the maximum magnetic rigidity is 1 Tm. The constructiion and the vacuum baking had been finished in September, 2005. The beam commissioning was started since October, 2005. The injected beam is 7 MeV proton from the existing linac. The beam circulation test and the electron beam cooling were carried out successfully and the beam information and the characteristics of the ring were measured. One of the subjects of S-LSR is a realization of the crystalline beams using the electron and laser cooling. The lattice of S-LSR was designed to suppress the beam heating as much as possible and we also present such measurement results in this paper.  
WEPCH167 Study of Scatterer Method to Compensate Asymmetric Distribution of Slowly Extracted Beam at HIMAC Synchrotron 2322
 
  • T. Furukawa, K. Noda, S. Sato, S. Shibuya, E. Takada, M. Torikoshi, S. Yamada
    NIRS, Chiba-shi
  
  In the medical use of the ion beam, the following characteristics of the beam are preferred: 1) Symmetric Gaussian beam profile is convenient for the scanning irradiation. 2) In the rotating gantry system, the symmetric beam condition can realize no-correlation between the beam profiles and the rotation angles of the gantry. However, the slowly extracted beam has asymmetric distribution in the phase-space and a difference between the horizontal emittance and vertical one. Thus, we have proposed the thin scatterer method to compensate the phase-space distribution of the slowly extracted beam, although the emittance is enlarged by scattering. As a result of particle tracking and experiment, it was verified that the asymmetric distribution was compensated by very small scattering angle. It was also simulated that this scatterer method can realize the symmetric beam condition for the rotating gantry. In this paper, these results of asymmetry compensation for the slow-extraction at HIMAC is presented.  
WEPCH168 Development toward Turn-key Beam Delivery for Therapeutic Operation at HIMAC 2325
 
  • T. Furukawa, T. Kanai, K. Noda, S. Sato, E. Takada, M. Torikoshi, S. Yamada
    NIRS, Chiba-shi
  • M. Katsumata, T. Shimojyu, T. Shiraishi
    AEC, Chiba
  
  Since 1994, more than 2500 cancer patients have been treated by carbon ion beam at HIMAC. To increase the number of patients per day, we have studied the reproducibility of the beam quality, such as the position, profile and intensity, during the operation. For this purpose, the accelerator needs high reproducibility to minimize the beam tuning time with more flexible scheme. Further, the irradiation system and the accelerator need to ensure dose uniformity. As a result of this study, it was found that a slight change of the magnetic field in the transport line would not affect the beam quality. However, a slight change of the horizontal tune strongly affects the beam quality because of a resonant slow-extraction. In this paper, we report about our investigation and present result of the development.  
WEPCH170 Development of Intensity Control System with RF-knockout Extraction at the HIMAC Synchrotron 2331
 
  • S. Sato, T. Furukawa, K. Noda
    NIRS, Chiba-shi
  
  We have developed a dynamic intensity control system toward scanning irradiation at the HIMAC Synchrotron. In this system, for controlling the spill structure and intensities of the beams extracted from the synchrotron, the amplitude of the RF-knockout is controlled with the response of 10 kHz. Its amplitude modulation (AM) function is generated based on an analytical one-dimensional model of the RF-knockout slow-extraction. In this paper, we describe the system for controlling amplitude modulation including feedback and the experimental result.  
THPCH053 Numerical and Experimental Study of Cooling-stacking Injection in HIMAC Synchrotron 2907
 
  • E. Syresin
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
  • S. Shibuya
    AEC, Chiba
  • T. Uesugi
    KEK, Ibaraki
  
  The cooling-stacking injection at the HIMAC synchrotron was used to increase the intensity of Ar18+ ion beam. The beam stacking was realized in a horizontal free phase-space, which was created by the HIMAC electron cooler. The stack intensity of (1.5~2.5)·109 ppp was accumulated at an injection intensity of (0.3~1.0)e9. The stack intensity was limitted by the ion lifetime. A peculiarity of present cooling-stacking experiments is related to lifetime difference by a factor of 2~3 of the stack and injected ions. The lifetime of stack ions is determined by vacuum pressure. The new injected ions were slowly lost at multiple scattering on residual gas atoms at diffusion heating in the vertical direction caused by the acceptance of 30pi-mm-mrad and a reduction of cooling force at large betatron amplitudes. The results of numerical simulations and experimental study of cooling-stacking injection on the HIMAC synchrotron are presented.  
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).