Focus point on high-energy accelerators: advances, challenges, and applications R. B. Appleby, A. Bazzani, M. Giovannozzi and E. Levichev Eur. Phys. J. Plus, 138 1 (2023) 12 Published online: 09 January 2023 DOI: 10.1140/epjp/s13360-022-03620-8