| Paper |
Title |
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| MPPE005 |
Dynamic Aperture and Resonance Correction for JPARC-RCS
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979 |
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- A.Y. Molodojentsev, E. Forest, S. Machida
KEK, Ibaraki
- H. Hotchi, F. Noda, M.J. Shirakata, Y. Shobuda, H. Suzuki, K. Yamamoto
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- Y. Ishi
Mitsubishi Electric Corp, Energy & Public Infrastructure Systems Center, Kobe
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Main intrinsic field nonlinearities, which are common for synchrotrons with large aperture, are the nonlinear field of the bending magnets, the fringing field of the magnets and the sextupole field nonlinearity, used for the chromaticity correction. The particle motion in the ring bending magnets has been analyzed by two methods: (1) by direct integration of the particle motion equations in the 3D magnetic field (Tosca output), based on the 4th order Runge-Kutta integrator and (2) by determination the transfer 8th order map of the bending magnet by using the Gaussian wavelet in the 3D space. The second technique allows us to use powerful tools such as the normal form analysis, to define the resonance driving terms, which can be used for the resonance correction. As the result of this study it was shown that the main limitation of the RCS dynamic aperture can be caused by the structure normal sextupole-order resonance and the normal octupole-order resonance. Other high-order resonances have smaller effects on the particles motion than the resonances mentioned above. The correction scheme to improve the dynamic aperture near the normal sextupole-order resonance has been analyzed.
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| FOAB004 |
Construction of FFAG Accelerators in KURRI for ADS Study
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350 |
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- M. Tanigaki, K. Mishima, S. Shiroya
KURRI, Osaka
- S. Fukumoto, Y. Ishi
Mitsubishi Electric Corp, Energy & Public Infrastructure Systems Center, Kobe
- M. Inoue
SLLS, Shiga
- S. Machida, Y. Mori
KEK, Ibaraki
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KART (Kumatori Accelerator driven Reactor Test) project is in progress at Kyoto University Research Reactor Institute (KURRI) from the fiscal year of 2002. The purposes of this project is the feasibility study of ADS, such as studying the effect of incident neutron energy on the effective multiplication factor of the subcritical nuclear fuel system. We are now constructing a proton FFAG accelerator complex as a neutron production driver for this project. Our accelerator complex consists of a 2.5 MeV FFAG with induction acceleration as an injector, 20 MeV and 150 MeV FFAGs with RF acceleration as a booster and a main ring, respectively. Our FFAG injector is a spiral sector type with 32 trim coils to produce a magnetic field of variable field index. Both booster and main rings are the radial sector type in which the field index is determined by the shape of pole-face. The test operations of the injector and the whole FFAG complex are expected around the spring and summer in 2005, respectively. Then this FFAG complex will be combined with our Kyoto University Critical Assembly (KUCA) in KURRI by the end of March 2006 for the feasibility study.
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