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| WEPC150 |
Fast Local Bump System for Helicity Switching at the Photon Factory
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2356 |
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- K. Harada, Y. Kobayashi, T. Miyajima, S. Nagahashi, T. Obina
KEK, Ibaraki
- S. Matsuba
Hiroshima University, Graduate School of Science, Higashi-Hiroshima
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Two APPLE-II type variably polarizing undulators will be installed at the south straight section of the PF (Photon Factory) ring. The 10Hz fast orbit switching in these undulators will be conducted for the helicity switching. The required angular difference of the orbits in two undulators is 0.3mrad. The five identical bump magnets and AC power supplies are manufactured to make 10Hz time varying local bumps. In order to achieve the local bump and prevent the fluctuation of the beam orbit with the effects of the insertion devices and magnetic errors, the feed forward correction with the bump magnets and the feedback correction with the fast steering magnets are required. In this presentation, the measurement results of the magnetic field and the frequency response, the configuration of the control system, and the simulation results to achieve the local bumps are shown.
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