Towards the ultimate storage ring: the lattice design for Beijing Advanced Photon Source

TL;DR

This paper presents the design of an ultra-low emittance storage ring for the Beijing Advanced Photon Source, utilizing advanced optimization techniques to achieve near-ultimate beam quality within a 1200 m circumference.

Contribution

It introduces a novel lattice design combining multiple advanced technologies to significantly reduce emittance in a compact storage ring.

Findings

Achieved natural emittance of 75 pm in the lattice design.

Successfully managed beam dynamics with strong nonlinearities.

Demonstrated the effectiveness of combined optimization techniques.

Abstract

A storage ring-based light source, Beijing Advanced Photon Source (BAPS) is proposed to store 5-GeV low-emittance electron beam and to provide high-brilliance coherent radiation. In this paper, we report our efforts of pushing down the emittance of BAPS to approach the so-called ultimate storage ring, while fixing the circumference to about 1200 m. To help dealing with the challenge of beam dynamics associated with the intrinsic very strong nonlinearities in an ultralow-emittance ring, a combination of several progressive technologies is used in the linear optics design and nonlinear optimization, such as modified theoretical minimum emittance cell with small-aperture magnets, quasi-3rd-order achromat, theoretical analyzer based on Lie Algebra and Hamiltonian analysis, multi-objective genetic algorithm, and frequency map analysis. These technologies enable us to obtain satisfactory beam dynamics in one lattice design with natural emittance of 75 pm.