2023/12/08 by C. A. Lindstrøm, R. D'Arcy, Lindstrøm, C. A. +3 · 1 citation
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle Accelerators and Free-Electron Lasers #Particle Detector Development and Performance #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.2312.04975
openalex publication_date 2023/12/08 · openalex created_date 2023/12/12 · openalex updated_date 2026/07/28
This contribution outlines the HALHF concept, which combines the high gradients achievable in plasma-wakefield acceleration with conventional radio-frequency acceleration. In HALHF, beam-driven plasma-wakefield cells are used to accelerate electrons to high energy. Because plasma-based acceleration of positrons is problematic, conventional RF acceleration is used but to much lower energy. The HALHF concept utilises not only asymmetric energies but also asymmetric bunch charges and asymmetric transverse emittances, leading to comparable luminosity to conventional facilities but much lower capital cost. Possible upgrades to the HALHF facility are discussed, in particular to the \rmtt threshold and to 550 GeV, where the Higgs self-coupling and \rmttH coupling can be measured. Other upgrades include the provision of two interaction points, to implement a γ\unicodex2013γ collider of two possible types and finally a symmetric high-energy collider if the problem of plasma-based positron acceleration can be solved.