| Paper |
Title |
Page |
| MOPAN032 |
Eddy Current Effects in an Opposite-field Septum
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227 |
| |
- K. Fan, Y. Arakaki, I. Sakai
KEK, Ibaraki
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A large aperture, thin septum, high field opposite-field septum magnet has been developed for the injection of 50GeV main ring of J-PARC. Due to the eddy current generated in septum conductor, magnet yoke and magnet end plate, the field distribution was degraded. In the paper, eddy current effects on both transverse field and longitudinal field distribution are calculated. Correction methods and experiment results are introduced.
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| TUPAN052 |
New Beam Optics Design of Injection/Fast Extraction/Abort Lines of J-PARC Main Ring
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1508 |
| |
- M. Tomizawa, A. Y. Molodozhentsev, E. Nakamura, I. Sakai, M. Uota
KEK, Ibaraki
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J-PARC Main Ring has three straight sections for injection, slow extraction and fast extraction. Injection line has been redesigned so as to give a higher reliability for the thin septa. The magnetic field can be reduced by adding an extra kicker. New optics for the fast extraction with a larger acceptance has been proposed. In this design, the thin septa are replaced by kickers with a large aperture. Beam with an arbitrary energy can be aborted from opposite side from the fast extraction. An external abort line has been designed to deliver the beam aborted with an arbitrary energy to a dump just by using a static quadrupole doublet for the focus.
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