Locally symmetric lattices for storage ring light sources

TL;DR

This paper introduces the concept of locally symmetric lattices for storage ring light sources, which enhances nonlinear dynamics control and optimization within the lattice design.

Contribution

It proposes a novel lattice design with local symmetry properties that improve nonlinear effects management in storage rings.

Findings

Effective cancellation of sextupole nonlinear effects within a lattice cell

Two types of locally symmetric lattices designed for a 2.2 GeV storage ring

Availability of multiple sextupole knobs for further nonlinear optimization

Abstract

In this paper, a new lattice concept called the locally symmetric lattice is proposed for storage ring light sources. In this new lattice, beta functions are made locally symmetric about two mirror planes of the lattice cell, and the phase advances between the two mirror planes satisfy the condition of nonlinear dynamics cancellation. There are two kinds of locally symmetric lattices, corresponding to two symmetric representations of lattice cell. In a locally symmetric lattice, main nonlinear effects caused by sextupoles can be effectively cancelled within one lattice cell, and generally there can also be many knobs of sextupoles available for further optimizing the nonlinear dynamics. Two kinds of locally symmetric lattices are designed for a 2.2 GeV diffraction-limited storage ring to demonstrate the lattice concept.