Abstract
SuperKEKB is an electron–positron asymmetric-energy double-ring collider, which was built in Japan. It has been operated to explore new phenomena in B-meson decays. Hence, extremely higher luminosity is required. A collision scheme of low emittance with a large Piwinski angle called a “nano-beam scheme” has been adopted to achieve higher luminosity by squeezing the vertical beta function at the interaction point to be smaller than the bunch length. A “crab waist collision scheme” proposed by P. Raimondi et al. has also been adopted to improve the luminosity performance. The article presents an overview of the operation of the nano-beam and crab waist collision schemes at SuperKEKB.
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Data Availability Statement
This manuscript has associated data in a data repository. [Authors’ comment: All data included in this manuscript are available upon requested by contacting with the corresponding author and the SuperKEKB collaboration at https://www-superkekb.kek.jp.]
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Acknowledgements
We thank the MDI group of the Belle II collaboration for helping with the machine tuning and physics operation. Further, we thank all members of the INFN(LNF)-KEK collaboration for the fruitful discussions on the crab waist collision scheme. This work is supported by KEK and Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
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Ohnishi, Y., Abe, T., Akai, K. et al. SuperKEKB operation using crab waist collision scheme. Eur. Phys. J. Plus 136, 1023 (2021). https://doi.org/10.1140/epjp/s13360-021-01979-8
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DOI: https://doi.org/10.1140/epjp/s13360-021-01979-8