HALHF: a hybrid, asymmetric, linear Higgs factory using plasma- and RF-based acceleration
Abstract
HALHF is a hybrid linear collider that uses electron-driven plasma-wakefield acceleration to accelerate electrons to high energy while using radio-frequency cavity technology to accelerate positrons. The most cost-effective solution collides low-energy positrons with high-energy electrons, producing a boost to the final state in the electron direction with . The current HALHF baseline design produces a luminosity comparable to that of the baseline ILC but with a greatly reduced construction and carbon footprint and hence much lower cost than the mature linear-collider designs ILC and CLIC. Costs for HALHF are evaluated, together with that for the approximate 15-year R\&D programme necessary to realise HALHF. Time scales and cost for the R\&D are estimated. Upgrade paths for HALHF technology from a 250~GeV Higgs factory, through 380 and 550~GeV, up to 10~TeV are sketched.
Keywords
Cite
@article{arxiv.2503.19880,
title = {HALHF: a hybrid, asymmetric, linear Higgs factory using plasma- and RF-based acceleration},
author = {Erik Adli and Joshua Appleby and Timothy L. Barklow and Marica Biagini and Jonas Björklund Svensson and Mikael Berggren and Simone Bettoni and Stewart Boogert and Philip Burrows and Allen Caldwell and Jian Bin Ben Chen and Vera Cilento and Laura Corner and Richard D'Arcy and Steffen Doebert and Wang Dou and Pierre Drobniak and Calvin Dyson and Sinead Farrington and John Farmer and Angeles Faus-Golfe and Manuel Formela and Arianne Formenti and Louis Forrester and Brian Foster and Jie Gao and Spencer Gessner and Niclas Hamann and Alexander Harrison and Mark J. Hogan and Eir Eline Hørlyk and Daniel Kalvik and Antoine Laudrain and Reme Lehe and Wim Leemans and Carl A. Lindstrøm and Benno List and Jenny List and Xueying Lu and Edward Mactavish and Vasyl Maslov and Emilio Nanni and John Osborne and Jens Osterhoff and Felipe Peña and Gudrid Moortgat Pick and Kristjan Põder and Jurgen Reuter and Dmitrii Samoilenko and Nela Sedlackova and Andrei Seryi and Kyrre Sjobak and Terry Sloan and Steinar Stapnes and Rogelio Tomas Garcia and Maxim Titov and Malte Trautwein and Maxence Thévenet and Nicholas J. Walker and Marc Wenskat and Matthew Wing and Jonathan Wood},
journal= {arXiv preprint arXiv:2503.19880},
year = {2025}
}
Comments
Submitted to the European Strategy for Particle Physics, 2026 Update