| Abstract: | The Large Hadron electron Collider (LHeC) is designed to move the field of
deep inelastic scattering (DIS) to the energy and intensity frontier of
particle physics. Exploiting energy recovery technology, it collides a novel,
intense electron beam with a proton or ion beam from the High Luminosity--Large
Hadron Collider (HL-LHC). The accelerator and interaction region are designed
for concurrent electron-proton and proton-proton operation. This report
represents an update of the Conceptual Design Report (CDR) of the LHeC,
published in 2012. It comprises new results on parton structure of the proton
and heavier nuclei, QCD dynamics, electroweak and top-quark physics. It is
shown how the LHeC will open a new chapter of nuclear particle physics in
extending the accessible kinematic range in lepton-nucleus scattering by
several orders of magnitude. Due to enhanced luminosity, large energy and the
cleanliness of the hadronic final states, the LHeC has a strong Higgs physics
programme and its own discovery potential for new physics. Building on the 2012
CDR, the report represents a detailed updated design of the energy recovery
electron linac (ERL) including new lattice, magnet, superconducting radio
frequency technology and further components. Challenges of energy recovery are
described and the lower energy, high current, 3-turn ERL facility, PERLE at
Orsay, is presented which uses the LHeC characteristics serving as a
development facility for the design and operation of the LHeC. An updated
detector design is presented corresponding to the acceptance, resolution and
calibration goals which arise from the Higgs and parton density function
physics programmes. The paper also presents novel results on the Future
Circular Collider in electron-hadron mode, FCC-eh, which utilises the same ERL
technology to further extend the reach of DIS to even higher centre-of-mass
energies. |
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