Updated baseline design for HALHF: the hybrid, asymmetric, linear Higgs factory
Abstract
Particle physicists aim to construct a electron-positron Higgs factory as the next major particle collider. However, the high associated costs motivate the development of more affordable collider designs. Plasma-wakefield acceleration is a promising technology to this end. HALHF is a proposal for a Higgs factory that utilizes beam-driven plasma-wakefield acceleration to accelerate electrons to high energy with high gradient, while using radio-frequency acceleration to accelerate positrons to a lower energy. This asymmetry sidesteps a major difficulty in plasma acceleration: that of accelerating positrons with high efficiency and quality. Since publication, several challenges were identified in the original baseline design. We summarize the updated baseline design, which addresses these challenges, and describe the parameter- and cost-optimization process used to arrive at this design.
Keywords
Cite
@article{arxiv.2505.21654,
title = {Updated baseline design for HALHF: the hybrid, asymmetric, linear Higgs factory},
author = {C. A. Lindstrøm and E. Adli and J. B. B. Chen and P. Drobniak and E. E. Hørlyk and D. Kalvik and K. N. Sjobak and T. Barklow and S. Gessner and M. Hogan and M. Berggren and A. Laudrain and B. List and J. List and V. Maslov and K. Põder and M. Thévenet and N. Walker and J. Wood and S. Boogert and P. N. Burrows and V. Cilento and R. D'Arcy and B. Foster and S. Farrington and X. Lu and G. Moortgat-Pick and A. Seryi},
journal= {arXiv preprint arXiv:2505.21654},
year = {2026}
}
Comments
4 pages, 2 figures, submitted as an IPAC'25 proceeding (MOCD1)