Hadron-Elektron-Ringanlage
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| Hadron-Elektron-Ringanlage | |
|---|---|
| Name | Hadron-Elektron-Ringanlage |
| Caption | Conceptual layout |
| Type | Collider |
| Status | Proposal |
Hadron-Elektron-Ringanlage The Hadron-Elektron-Ringanlage was a proposed high-energy particle collider project envisaged to study electroweak and strong interactions through electron–proton collisions, involving collaborations among major laboratories and universities across Europe and worldwide. The proposal connected accelerator technology communities and funding agencies, drawing attention from experimental collaborations, theoretical groups, and industrial partners in the context of late-20th and early-21st century collider planning. The project interfaced with contemporaneous initiatives and planning bodies, engaging accelerator physicists, detector designers, and policy-makers.
Overview
The project proposal brought together institutions such as CERN, DESY, INFN, Max Planck Society, and Deutsches Elektronen-Synchrotron with academic groups from University of Oxford, University of Cambridge, University of Manchester, Imperial College London, ETH Zurich, University of Zurich, Institut Pasteur, École Normale Supérieure, University of Paris, Sorbonne University, University of Hamburg, University of Bonn, Technical University of Munich, RWTH Aachen University, University of Milan, Sapienza University of Rome, University of Pisa, Scuola Normale Superiore, and national laboratories such as Fermilab, SLAC National Accelerator Laboratory, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, KEK, and JINR. The proposal was discussed by advisory panels including members from European Commission, Deutsche Forschungsgemeinschaft, Science and Technology Facilities Council, and international panels associated with ICFA and ESFRI.
History and Development
Initial concepts emerged in forums where representatives of DESY and other labs debated post-LEP directions alongside plans for LHC upgrades and next-generation colliders such as ILC, CLIC, and FCC. Workshops at venues like Hamburg, Geneva, Rome, Milan, Hamburg Messe, DESY Zeuthen, CERN Council meetings, and conferences including EPS Conference on High Energy Physics, ICHEP, and Lepton-Photon Symposium shaped the scientific case. Key scientific advocates included research groups from H1, ZEUS, ATLAS, CMS, ALICE, and theoretical collaborations linked to Quantum Chromodynamics, Electroweak Theory, and lattice groups at CERN Theory Division and IHES.
Design and Technical Features
The proposal described a ring-ring collider architecture integrating electron storage rings and hadron storage rings with interaction regions designed for high-luminosity collisions, incorporating magnet technologies developed in projects like LHC, SPS, LEP, and superconducting magnet programs at ITER industrial partners. Beam dynamics studies referenced techniques from synchrotron radiation facilities such as ESRF, SOLEIL, and PETRA III and injector designs informed by DORIS and TRIUMF experience. Detector concepts proposed instrumentation drawing on heritage from H1, ZEUS, ATLAS, CMS, LHCb, ALICE, BaBar, Belle II, CLEO and calorimetry and tracking technologies advanced in collaborations with FNAL and KEK. Accelerator physics topics enlisted expertise from groups at SLAC, Brookhaven, CERN Accelerator School, Cockcroft Institute, and Daresbury Laboratory.
Scientific Goals and Experiments
The scientific case emphasized precision tests of Quantum Chromodynamics, parton distribution measurements complementary to LHC programs, electroweak precision studies connected to Standard Model predictions, searches for physics beyond the Standard Model related to hypotheses explored at Tevatron, B-factories, and future colliders like ILC and FCC, and investigations of hadronic structure that intersect with results from COMPASS, NA61/SHINE, HERMES, and neutrino experiments at T2K and NOvA. Proposed experimental collaborations anticipated cross-disciplinary input from groups experienced in deep inelastic scattering analyses such as HERA teams, global PDF fitting consortia including CTEQ, NNPDF, and MSTW, and phenomenology communities centered at DESY Theory Group and CERN PH.
Construction and Site Planning
Site evaluations considered reuse and upgrade paths at established accelerator campuses including layout studies near DESY Hamburg, interaction-region civil engineering lessons from CERN Meyrin site, environmental assessments akin to those undertaken for LHC and XFEL, and infrastructure coordination with regional authorities like Hamburg Senate, Bavarian Ministry of Science, and municipal planners. Industrial partners and contractors with experience from Siemens, ThyssenKrupp, ABB, Areva, and specialist firms in cryogenics and vacuum systems were part of feasibility dialogues, while safety, radiation shielding, and regulatory consultation involved national regulators such as Bundesamt für Strahlenschutz and international oversight bodies.
Project Status and Timeline
After conceptual design phases and community workshops, the proposal entered review cycles with advisory committees similar to those convened for LHC and XFEL, facing competition from projects like ILC, CLIC, and FCC. Funding deliberations involved national agencies including BMBF, DFG, ANR, ERC, STFC, and international coordination through forums like ESFRI and ICFA. Technical readiness activities mirrored milestones used in accelerator projects at CERN, DESY, and KEK, but the project did not reach construction funding and was superseded in strategic roadmaps by other large-scale initiatives.
Legacy and Impact on Particle Physics
Although not realized as a completed facility, the project influenced accelerator design studies, informed detector R&D programs, and contributed to the scientific community’s understanding of electron–hadron collision physics, with ripple effects in planning for LHeC, FCC-eh, and other successor concepts. The collaborative efforts connected researchers across institutions such as CERN, DESY, INFN, Max Planck Society, Fermilab, SLAC, KEK, and universities that later contributed to large experiments including ATLAS, CMS, LHCb, and ALICE, while methodological advances fed into accelerator schools, technology transfer to industry partners like Siemens and ABB, and policy discussions in bodies such as European Commission and ERC.