Coupled bunch stability with variable filling patterns in PETRA IV

TL;DR

This paper investigates how different filling patterns in PETRA IV's storage ring affect coupled-bunch stability, using a semi-analytical Vlasov solver to ensure beam quality and stability for photon science applications.

Contribution

It introduces a semi-analytical approach to analyze coupled-bunch stability with variable filling patterns in PETRA IV.

Findings

Filling patterns significantly influence coupled-bunch stability.

The semi-analytical Vlasov solver effectively predicts stability thresholds.

Design considerations for stable filling patterns are proposed.

Abstract

The PETRA IV upgrade project is aiming at building a 6 GeV diffraction-limited light source. The storage ring`s off-axis accumulation injection scheme will allow generating a wide range of filling patterns for the needs of photon science users. To reserve high beam quality and low transverse emittances it is imperative to ensure beam stability against collective effects. In this paper we investigate the impact of different filling patterns on the coupled-bunch stability in the ring using a semi-analytical Vlasov solver.