Lattice optimization of the Novosibirsk fourth-generation light source SKIF

TL;DR

This paper presents the lattice optimization of the SKIF fourth-generation light source, achieving low emittance and large dynamic aperture through specific lattice design choices, and explores potential upgrades to higher energy configurations.

Contribution

It introduces a optimized lattice design for SKIF with low emittance and sufficient dynamic aperture, and demonstrates its scalability to higher energy light source configurations.

Findings

Achieved 72 pm natural emittance at 3 GeV with optimized lattice.

Designed a 6 GeV version with 33 pm emittance and sufficient dynamic aperture.

Ensured energy acceptance over 5% for efficient injection and beam stability.

Abstract

We discuss the choice of the magnetic lattice and parameter optimization of the fourth generation light source SKIF (Russian acronym for Siberian Circular Photon Source) under construction in Novosibirsk. The study compares several basic lattice cells to procure one with low emittance and large dynamic aperture. The result is a developed lattice of SKIF with 72~pm natural emittance (at zero beam current and absent betatron coupling) at 3 GeV beam energy and 476 m circumference. Only two families of sextupoles provide horizontal and vertical dynamic apertures of 12 mm and 3.5 mm respectively and energy acceptance more than 5\%. To check the potential of the found solution, we used slightly modified SKIF lattice to design 6 GeV light source and reached 33 pm natural emittance for 1075 m circumference with 40 straight sections. Again, only two sextupole families ensure sufficient dynamic aperture (7 mm horizontal, 4~mm vertical) and energy acceptance more than 5\% for simple efficient injection and sufficient beam lifetime.