Author: Kase, M.
Paper Title Page
TUPP022 Development of the Calculation Method of Injection Beam Trajectory of RIKEN AVF Cyclotron with 4D Emittance Measured by the Developed Pepper-Pot Emittance Monitor 346
  • Y. Kotaka, N. Imai, Y. Ohshiro, Y. Sakemi, S. Shimoura, H. Yamaguchi
    CNS, Saitama, Japan
  • A. Goto, M. Kase, T. Nagatomo, T. Nakagawa, J. Ohnishi
    RIKEN Nishina Center, Wako, Japan
  • K. Hatanaka
    RCNP, Osaka, Japan
  • H. Muto
    Suwa University of Science, Chino, Nagano, Japan
  The Center for Nuclear Study, the University of Tokyo and RIKEN Nishina Center have been developing the AVF Cyclotron system at RIKEN. One of the important developments is to improve the transport system of the injection beam line. The transport efficiencies tend to decrease as beam intensities increase. To solve this problem, we developed the calculation method to trace a beam trajectory with a four-dimensional (4D) beam emittance measured by pepper-pot emittance monitor (PEM) as initial value. The reason for using the 4D beam emittance is that the transport system has rotating quadrupole magnets and solenoid coils, and that the space charge effect can be introduced. The beams through a pepper-pot mask can be detected on the potassium bromide fluorescent plate inclined 45 degree to the beam to be recorded by digital camera using developed PEM. We compared the calculated beam trajectory with the measurement of other beam diagnostics and quantified the degree of fit. It has been found that the degree of fit is improved by changing fiducial points on the fluorescent plate and optimizing the thickness of the fluorescent agent and the exposure time and gain of the digital camera.  
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About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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