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Agematsu, T.

Paper Title Page
THPC045 Beam Uniformization System Using Multipole Magnets at the JAEA AVF Cyclotron 3077
 
  • Y. Yuri, T. Agematsu, I. Ishibori, T. Ishizaka, H. Kashiwagi, S. Kurashima, N. Miyawaki, T. Nara, S. Okumura, K. Yoshida, T. Yuyama
    JAEA/ARTC, Takasaki
 
  It has been known that uniformization of a beam with a Gaussian profile is possible utilizing odd-order nonlinear forces*. Here, we investigate uniformization of the transverse beam profile using nonlinear-focusing forces produced by multipole magnets in detail. We show that it is possible to uniformize an asymmetric beam as well as a Gaussian beam utilizing the odd and even-order nonlinear forces in combination**. It enables us to perform high-uniformity irradiation at a constant particle fluence rate over the whole area of a large target. A research and development study of the beam uniformization system composed of sextupole and octupole magnets is now in progress at the JAEA AVF cyclotron facility. Some results of preliminary experiments on beam uniformization are also reported.

*P. F. Meads, Jr., IEEE Trans. Nucl. Sci. 30, 2838 (1983).
**Y. Yuri et al., Phys. Rev. ST Accel. Beams 10, 104001 (2007).