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- N. Ohuchi, N. Higashi, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto, M. Tawada, K. Tsuchiya, H. Yamaoka, Z.G. Zong
KEK, Ibaraki, Japan
- M. Anerella, J. Escallier, A.K. Jain, A. Marone, B. Parker, P. Wanderer
BNL, Upton, Long Island, New York, USA
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SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The superconducting magnet system has been designed in order to attain high luminosity. The system consists of 8 superconducting quadrupoles, 4 superconducting solenoids and 43 superconducting correctors. The magnets are installed into two cryostats in the interaction region, IR. For each beam, the final focusing system consists of quadrupole-doublets with 8 superconducting quadrupoles. To reduce the beam emittance at the IP, the superconducting solenoids cancel the integral solenoid field of the particle detector, Belle II, on the beam lines. The corrector system is very complicated and the multi-layered coils are mainly assembled inside of the quadrupole bores. In the paper, we would like to describe the most updated design of the superconducting magnet system for the SuperKEKB IR.
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