Chaos indicators for nonlinear dynamics in circular particle accelerators C. E. Montanari, R. B. Appleby, A. Bazzani, A. Fornara, M. Giovannozzi, S. Redaelli, G. Sterbini and G. Turchetti Eur. Phys. J. Plus, 140 6 (2025) 603 Published online: 27 June 2025 DOI: 10.1140/epjp/s13360-025-06552-1