Author: Noda, K.
Paper Title Page
MOPPT008 Present Status of Cyclotrons (NIRS-930, HM-18) at NIRS 46
  • S. Hojo, T. Honma, K. Katagiri, M. Nakao, A. Noda, K. Noda, A. Sugiura
    NIRS, Chiba-shi, Japan
  • A.K. Komiyama, T. Okada, Y. Takahashi
    AEC, Chiba, Japan
  The cyclotron facility at National Institute of Radiological Science (NIRS) consists of a NIRS-930 cyclotron (Thomson-CSF AVF-930, Kb=110 MeV and Kf=90 MeV) and a small cyclotron HM-18(Sumitomo- Heavy- Industry HM-18). The NIRS-930 has been used for production of short-lived radio-pharmaceuticals for PET, research of physics, developments of particle detectors in space, and so on. The orbit of a beam in the NIRS-930 cyclotron was simulated with integrated approach to modelling of the cyclotron, including calculation of electromagnetic fields of the structural elements. And some improvements such as installation of extracted beam probe, a beam attenuator and a beam viewer in an injection beam line, were performed in the NIRS-930. The HM-18 has been used for production of short-lived radio-pharmaceuticals for PET. It allows us to accelerate H-and D- ion at fixed energies of 18 and 9 MeV, respectively. In order to improve the isochronism, a phase probe has been newly installed in the HM-18. Above improvements and operational status of the cyclotron facility are to be presented in this report.  
TUPPT008 A Profile Analysis Method for High-Intensity DC Beams Using a Thermographic Camera 168
  • K. Katagiri, S. Hojo, T. Honma, A. Noda, K. Noda
    NIRS, Chiba-shi, Japan
  A new analysis method for the digital-image processing apparatus has been developed to evaluate profiles of high-intensity DC beams from temperature images of irradiated-thin foils. Numerical calculations were performed to examine the reliability and the performance of the profile analysis method. To simulate the temperature images acquired by a thermographic camera, temperature distributions were numerically calculated for various beam parameters. The noises in the temperature images, which are added by the camera sensor, were also simulated to be taken its effect into account. By using the profile analysis method, the beam profiles were evaluated from the simulated-temperature images, and they were compared with the exact solution of the beam profiles. We found that the profile analysis method is adaptable over a wide beam current range of ~0.1 – 10 μA, even if a general-purpose thermographic camera with rather high noise (NETD ~ 0.3 K, NETD: Noise Equivalent Temperature Difference) is employed.