Description
Presented in this paper is the beam optics design of the final focus system (FFS) for the Super tau charm facility (STCF) in China, which is an electron positron circular collider with center-mass-energy (CME) from 2 GeV to 7 GeV. To achieve a luminosity of more than $ 5 \times 10^{34} cm^{-1}s^{-1}$, FFS with Large Piwinsky angle and crab waist scheme.
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