Lattice optimization of a fourth-generation synchrotron radiation light source in Novosibirsk

We discuss the choice of the magnetic lattice and parameter optimization of the fourth-generation light 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 and 4 mm vertical) and energy acceptance more than 5% for simple efficient injection and sufficient beam lifetime.

Automated summary

This study discusses the magnetic lattice selection and parameter optimization for a fourth-generation light source. Through comparing different lattice cells, a lattice with low emittance and large dynamic aperture was developed for SKIF. The research found that only two families of sextupoles are needed to provide sufficient dynamic aperture and energy acceptance for efficient injection and beam lifetime.