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THPZ007 |
Lattice Design of Low Emittance and Low Beta Function at Collision Point for SuperKEKB |
3693 |
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- Y. Ohnishi, H. Koiso, A. Morita, K. Oide, H. Sugimoto
KEK, Ibaraki, Japan
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Extremely low beta function at the interaction point(IP) and low emittance are necessary to achieve the design luminosity of 8x1035 cm-2 s-1 for a SuperKEKB project. The low emittance with a large Piwinski angle makes this possible with longer bunch longitudinally compared with the vertical beta function at IP. We call this Nano-beam scheme. In this scheme, a beam-beam parameter is realized to be less than 0.09 for the design luminosity. The lattice features, chromaticity corrections, and dynamic aperture are discussed in this article.
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