PETRA IV study with non-interleaved sextupole scheme

TL;DR

This paper proposes a non-interleaved sextupole scheme for designing the PETRA IV storage ring, aiming to achieve diffraction-limit synchrotron light, with detailed lattice design and beam dynamics simulation.

Contribution

It introduces a novel lattice design combining different cell types and hybrid sections for PETRA IV, enhancing chromaticity correction and beam stability.

Findings

Successful lattice construction with mixed cell types

Effective chromaticity correction using non-interleaved sextupoles

Beam dynamics simulations show stable operation

Abstract

This study is to use the non-interleaved sextupole scheme to design PETRA IV storage ring, which is an upgrade from PETRA III, toward diffraction-limit synchrotron light source. The lattice is constructed by mixing different types of cells. Double minus identity cell is responsible for the chromaticity correction with non-interleaved sextupoles, while the combined function FODO cells provide straights with small beta functions for undulators. These are the basic building bricks. In addition, two hybrid sections with 10-m long super ID are custom-made to adapt to the configuration of DESY's current cite plan. The beam dynamic behaviors are simulated and discussed.