eeFACT 2025 - 70th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e– Colliders

Optics design of the interaction region for the STCF

Not scheduled

20m

EPOCHAL

Invited Oral Presentation WG5 : Machine Detector Interface Machine Detector Interface

Speaker

Linhao Zhang (University of Science and Technology of China)

Description

The Super Tau-Charm Facility (STCF), proposed in China, is a new-generation high luminosity e+/e− collider in the low-energy region of 1-3.5 GeV. To achieve the target luminosity of larger than 5×10^34 cm^−2s^−1, a large crossing angle and crab-waist correction scheme is applied. It is well-known that nonlinearity within the interaction region (IR), particularly due to crab sextupoles, significantly decreases both dynamic and momentum apertures. Consequently, the design of IR optics holds critical importance in enhancing the Touschek lifetime. In this paper, we will present the modular linear optics design for the STCF IR, to facilitate nonlinear optimization. Furthermore, we will elaborate on high-order chromaticity correction methods aimed at broadening the momentum bandwidth, thereby improving the Touschek lifetime.