Vol. 6 (2025): The hadron collider FCC-hh: Extended conceptual design report

Editor: Daniel Schulte, CERN

This document provides a detailed account of several studies regarding the design of the FCC-hh hadron collider that have been performed in the time period between 2019 and 2021. They extend and complement the studies reported in the conceptual design report submitted to the 2019 Update of the European Strategy for Particle Physics.