HALHF Project

Welcome to the Hybrid Asymmetric Linear Higgs Factory (HALHF) Collaboration page. HALHF is a novel concept to build a relatively cheap "Higgs Factory" with a luminosity comparable to the conventional International Linear Collider (ILC) and Compact Linear Collider (CLIC) proposals. The HALHF concept is based on a hybrid design in which positrons are accelerated to 31 GeV in a conventional linac, which also provides the drive beams for a plasma-wakefield arm that accelerates electrons to 500 GeV. The energies are selected to produce Higgs particles in conjunction with Z bosons. The HALHF Collaboration is dedicated to R&D to prepare a pre-conceptual design in the context of the European Lab Directors' Group ESPP  Plasma Accelerators Working Group. 

Archived News

B. Foster, R. D'Arcy, C.A. Lindstrøm, "A hybrid, asymmetric, linear Higgs factory based on plasma-wakefield and radio-frequency acceleration", New J. Phys. 25 093037 (2023)