Speaker
Description
A novel Complex Bend (CB) magnet design has been developed at NSLS-II to support the storage ring future upgrade toward near-diffraction-limited performance. The CB concept, replacing the conventional dipole electromagnets with compact permanent-magnet combined-function elements, will provide both strong focusing and bending within a single curved assembly. NSLS-II upgrade will implement 120 CBs to achieve an ultra-low emittance of 15 pm·rad at 4 GeV, while preserving 8.8 m-long straight sections and reducing ring magnet power consumption by 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 preserves the existing tunnel geometry, provides sufficient dynamic and momentum apertures for off-axis injections, and minimizes modifications to power supplies and optics. In this paper, we will describe the design considerations and lattice optimization for the CB implementation.
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