Speaker
Description
A novel Complex Bend (CB) magnet design has been developed at NSLS-II to support the future storage ring upgrade toward near-diffraction-limited performance. The CB concept replaces conventional dipole electromagnets with compact permanent-magnet combined-function elements, providing both strong focusing and bending within a single curved assembly. The NSLS-II upgrade will implement 120 CBs to achieve a low emittance of 15 pm·rad at 4 GeV, while preserving 8.8 m-long straight sections and reducing the ring magnet power consumption by about 70%. To further validate the CB approach as a reliable, high-performance solution for next-generation synchrotron light sources, two existing dipoles in the NSLS-II storage ring will be replaced with CBs while maintaining normal operations. The lattice design should preserve the existing tunnel geometry, minimize modifications to power supplies and optics, provide sufficient dynamic and momentum apertures for off-axis injection, and be tolerant to errors. This paper provides an overview of the design considerations for the CB installation.
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