CLIC
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| CLIC | |
|---|---|
| Name | Compact Linear Collider |
| Acronym | CLIC |
| Established | 1980s (conceptual), 2012 (project study phase) |
| Type | High-energy particle collider project |
| Location | CERN, Geneva, Switzerland (planned) |
| Budget | multi-billion CHF (projected) |
| Website | CERN CLIC Study |
CLIC
The Compact Linear Collider is a proposed high-energy particle accelerator concept designed to probe electroweak symmetry breaking, Higgs boson couplings, and physics beyond the Standard Model. Initiated within the European Organization for Nuclear Research community and developed by international teams, the project aims to complement facilities such as the Large Hadron Collider, International Linear Collider, Future Circular Collider, and other collider initiatives. CLIC targets precision measurements alongside direct searches for new particles, linking programs at Fermilab, DESY, KEK, SLAC National Accelerator Laboratory, and national laboratories worldwide.
Overview
CLIC is a three-stage linear electron–positron collider concept that envisions staged center-of-mass energies to explore phenomena across scales indicated by Standard Model tests and anomalies seen at colliders like the Large Hadron Collider. The design leverages a novel two-beam acceleration scheme originally developed in collaboration with CERN accelerator physicists and tested in facilities including the CTF3 test facility and at SLAC. The project proposal situates the machine at the CERN site near Geneva, integrating civil engineering studies tied to regional institutions such as EPFL and coordinating with funding agencies including the European Commission and national research councils in France, Germany, United Kingdom, Italy, and Switzerland.
Physics Goals
CLIC’s physics goals center on precision studies of the Higgs boson, electroweak gauge bosons like the W boson and Z boson, and top quark physics exemplified by the Top quark threshold. The collider aims to measure Higgs couplings, branching ratios, and self-coupling to confront predictions from the Standard Model and extensions including supersymmetric frameworks such as Minimal Supersymmetric Standard Model scenarios or composite Higgs models inspired by Technicolor-like ideas. Sensitivity to new heavy resonances, dark sector candidates motivated by searches at the LHC, and rare processes connected to Lepton flavor violation is part of the science case, tied to precision electroweak constraints from legacy experiments like LEP and ongoing analyses from ATLAS and CMS.
Accelerator Design and Technology
The CLIC accelerator design employs a two-beam acceleration concept where a high-current, low-energy drive beam generates RF power to accelerate the main low-current, high-energy beam. Key technologies include high-gradient normal-conducting X-band accelerating structures, precision alignment systems developed with expertise from CERN and DESY, and high-power RF modulators akin to systems at SLAC National Accelerator Laboratory. Components tested at the CTF3 facility and in collaborative efforts with KEK and INFN have addressed breakdown limits, beam dynamics, and wakefield effects. Civil engineering considerations reference tunnel projects like the Gotthard Base Tunnel and integration studies comparable to the LHC injector chain, with beam delivery systems informed by expertise from TRIUMF and Brookhaven National Laboratory.
Detector Concepts
Detector concepts for the project draw on designs by collaborations formed from teams with experience at ATLAS, CMS, ILC detector studies, and precision experiments such as Belle II and LEP detectors. Proposed detector concepts prioritize excellent jet energy resolution, vertexing performance akin to DELPHI and ALEPH silicon trackers, and calorimetry inspired by particle flow algorithms developed in the CALICE collaboration. Technologies under consideration include silicon pixel vertex detectors similar to MIMA and DEPFET developments, time-stamping calorimeters tested in prototype campaigns at facilities like CERN SPS, and forward instrumentation to tag scattered electrons in processes studied at HERA and SLAC.
Project Status and Timeline
As of the latest project studies, CLIC has completed conceptual design and technology validation phases, with ongoing technical development and cost studies coordinated by CERN and partner institutes. Timeline scenarios present an initial low-energy stage (around 380 GeV) followed by energy upgrades to 1.5 TeV and 3 TeV, contingent on funding decisions and results from ongoing analyses at the LHC and other facilities. Decision milestones are linked to strategic roadmaps set by organizations such as the European Strategy for Particle Physics board, national funding agencies, and advisory bodies like the ICFA.
Collaborations and Funding
CLIC development is a multinational collaboration involving accelerator laboratories and university groups from countries including Switzerland, France, Germany, United Kingdom, Italy, Spain, United States, Japan, China, India, and others. Institutional partners include CERN, ITER (engineering synergies), INFN, CNRS, DESY, KEK, STFC, and national laboratories such as SLAC and Fermilab. Funding discussions link proposals to national research councils, the European Union framework programmes, and contributions from member states coordinated through CERN governance.
Challenges and R&D Priorities
Major technical challenges include achieving reliable high-gradient performance in X-band structures, mitigating RF breakdowns demonstrated in experiments at CTF3 and KEK, and maintaining beam stability at nanometer scales, an area informed by work at ATF2 and beam-based alignment techniques from SLAC. Detector R&D priorities focus on low-mass vertex detectors, fast-timing calorimetry, and background suppression methods developed in collaboration with CALICE and detector groups from ILC studies. Project-level risks involve cost, siting, and international coordination, with governance and review processes comparable to those for projects like the LHC upgrade programmes and the International Linear Collider negotiations.