HALHF Project | John Adams Institute for Accelerator Science

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.

News 11/12/23

A new paper has been submitted to arXiv, which contains the latest project status and a description of a variety of upgrades to the original Higgs factory concept. It will appear in the Proceedings of the European Advanced Accelerator Concepts Workshop, Elba, 17 -22 September, 2023.

Status of and upgrade concepts for HALHF: the hybrid, asymmetric, linear Higgs factory

C. A. Lindstrøm, R. D'Arcy, B. Foster

Previous Meetings

HALHF Collaboration Kick-off Meeting, DESY, Hamburg, Afternoon of 23.10.2023 (Password HALHF-DESY-2023)

HALHF Collaboration Physics & Detector Meeting, 19.12.2023, 12.30-14.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 18.12.2023, 16.00-18.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 29.01.2024, 16.00-18.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 04.02.2024, 16.00-18.00 CET

HALHF Workshop, Oslo, 04-05.4.2024

HALHF Collaboration Accelerator Task Force Meeting, 14.05.2024, 16.00-18.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 12.06.2024, 16.00-18.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 03.07.2024, 16.00-18.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 29.08.2024, 16.00-18.00 CET

HALHF Collaboration Accelerator Task Force Meeting, 24.09.2024, 16.00-18.00 CET

HALHF Workshop, Erice, Sicily, 03-08.10.24

HALHF Collaboration Accelerator Task Force Meeting, 02.12.2024, 16.00-18.00 CET

Future Meetings

HALHF Workshop, DESY, Hamburg, Germany, 28-29.02.2025

ALEGRO 2023, Hamburg, Germany, 23.03.2023:

A Hybrid Asymmetric Linear Higgs Factory (HALHF): B. Foster

LCWS 2023, SLAC, Stanford, CA, USA, 15.5.2023:

A hybrid, asymmetric, linear Higgs factory based on plasma-wakefield and radio-frequency acceleration: B. Foster

Community Report on Accelerators Roadmap, Frascati, Italy, 12.07.2023:

The HALHF Project: C.A. Lindstrøm

Implications for the future physics programme: B. Foster

EPS 2023, Hamburg, Germany, 23.08.2023:

The HALHF Project: B. Foster

Physics Performance and Detector Requirements at an Asymmetric Higgs Factory: A. Laudrain

EAAC 2023, Elba, Italy, 22.09.2023:

A Hybrid Asymmetric Linear Higgs Factory (HALHF): C.A. Lindstrøm

Readiness of electron plasma linacs for a collider application: E. Adli

CLIC Mini Week, CERN, 11 - 13.12.2023:

HALHF Plans: B. Foster

ALEGRO Workshop, Lisbon, 19 - 22.03.2024

Hybrid Asymmetric Linear Higgs Factory (HALHF): Updates and Upgrades: R. D'Arcy

CEPC European Workshop, Marseilles, 8 - 11.04.2024

Status of the HALHF Project: B. Foster

Laboratoire Leprince-Ringuet (LLR), Ecole Polytechnique, Paris

The HALHF Project: B. Foster

European Laboratory Directors Group Meeting, Brookhaven National Laboratory, NY, USA, 6 - 7.06.2024

Parameter Optimisation of HALHF and Near-Term Goals: ESPP Roadmap: R. D'Arcy & C.A. Lindstrøm

LCWS24 Tokyo University, Tokyo, Japan, 8 - 11.07.2024

HALHF Status: B. Foster

ICHEP24, Prague, Czech Republic, 18 - 24.07.2024

Status of HALHF - a concept for a hybrid asymmetric linear Higgs factory: B. Foster

Physics Performance and Detector Requirements at an Asymmetric Higgs Factory: A. Laudrain

CEPC Workshop, Hangzhou, China, 23 - 26.10.2024

Status of HALHF: B. Foster

ECFA, CERN, 14 -15.11.2024

Plasma Accelerators and the HALHF Concept: E. Adli

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