ESRF-type lattice design and optimization for the High Energy Photon Source

TL;DR

This paper presents an ESRF-type lattice design for the High Energy Photon Source, achieving ultra-low emittance and promising beam dynamics for a next-generation diffraction-limited storage ring.

Contribution

It introduces a novel ESRF-type hybrid multi-bend achromat lattice design for the HEPS, optimizing emittance and beam stability for advanced light source applications.

Findings

Emittance as low as 60 pm.rad achieved

Dynamic aperture suitable for on-axis injection demonstrated

Design maintains moderate momentum acceptance

Abstract

A new generation of storage ring-based light source, called diffraction-limited storage ring (DLSR), with emittance approaching the diffraction limit for multi-keV photons by means of multi-bend achromat lattice, has attracted worldwide and extensive studies. Among various DLSR proposals, the hybrid multi-bend achromat concept developed at ESRF predicts an effective way of minimizing the emittance and meanwhile keeping the required sextupole strengths to an achievable level. For the High Energy Photon Source planned to be built in Beijing, an ESRF-type lattice design consisting of 48 hybrid seven-bend achromats is proposed to reach emittance as low as 60 pm.rad with a circumference of about 1296 m. Sufficient dynamic aperture promising vertical on-axis injection and moderate momentum acceptance are achieved simultaneously for a promising ring performance.