Compact Linear Collider
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| Compact Linear Collider | |
|---|---|
| Name | Compact Linear Collider |
| Status | Proposed |
| Type | Linear collider |
| Energy | Up to 3 TeV (staged) |
| Length | ~50 km (full 3 TeV) |
| Operators | CERN, partner laboratories |
| Participants | International collaboration |
Compact Linear Collider The Compact Linear Collider is a proposed high-energy particle accelerator concept developed to explore fundamental particle physics at multi-teraelectronvolt scales. It is a linear electron–positron collider design that builds on advances from projects such as Large Electron–Positron Collider, Large Hadron Collider, and test facilities including CLIC Test Facility 3, aiming to deliver precision measurements and searches complementary to programs at International Linear Collider and high-luminosity upgrades of the Large Hadron Collider. The project involves global institutions including CERN, national laboratories, and university groups across Europe, Asia, and the Americas.
Introduction
The project concept originated from accelerator research programs at CERN and collaborations with laboratories like DESY, SLAC National Accelerator Laboratory, and KEK. It is framed within broader strategic reviews such as those by the European Strategy for Particle Physics and community roadmaps like the Particle Physics Project Prioritization Panel. The design responds to results from experiments at ATLAS, CMS, LEP, and flavor factories including Belle II and BaBar, targeting precision studies of particles discovered at the Large Hadron Collider and phenomena motivated by theories associated with Higgs boson properties, supersymmetry, and beyond-Standard-Model scenarios explored at facilities such as Fermilab and Brookhaven National Laboratory.
Design and Technology
The design features a two-beam acceleration scheme developed from research at testbeds including CTF3 and expertise from SLAC. It envisions a drive-beam complex that powers high-gradient accelerating structures, drawing on technology demonstrations at CERN Accelerator School training sites and industrial partnerships with companies experienced in superconducting and normal-conducting radio-frequency systems. Key components reference advances from projects such as European XFEL, ILC Technical Design Report, and innovations tested at FLASH and SPring-8. The accelerator layout integrates damping rings, bunch compressors, main linacs, and sophisticated beam delivery systems with vibration control informed by studies at Gran Sasso National Laboratory and Laboratori Nazionali di Frascati.
Physics Goals and Research Program
The scientific program aims for precision measurements of the Higgs boson couplings, top-quark properties, and electroweak processes, providing complementary sensitivity to direct searches performed at ATLAS and CMS. It would probe scenarios proposed in theoretical work related to supersymmetry, extra dimensions, and models connected to dark matter searches pursued by experiments at XENONnT and LUX-ZEPLIN. The staged energy approach targets thresholds linked to studies at Tevatron-era analyses, precision electroweak fits used by groups at CERN and DESY, and effective-field-theory interpretations developed by collaborations associated with Perimeter Institute and university theory groups. Detector concepts draw on experience from ILD, SiD, and calorimetry R&D originally motivated by prior collider experiments.
Site and Implementation Plan
Site planning considers potential locations near established research campuses, leveraging infrastructures comparable to those supporting CERN and national laboratories such as Fermilab and DESY. Civil engineering proposals reference tunneling expertise demonstrated on projects like Gotthard Base Tunnel and environmental assessments guided by regulatory frameworks in host states and consultations with organizations such as European Commission research programs. Implementation phases align with governance models practiced by multi-national projects including ITER and European Spallation Source, coordinating contributions from agencies like NSF, DOE, JAEA, and national funding bodies.
Cost, Timeline, and International Collaboration
Cost estimates and staging scenarios have been developed in consultation with stakeholders analogous to budgeting processes used for Large Hadron Collider upgrades and large facilities like Square Kilometre Array. The timeline contemplates preparatory R&D, site selection, industrial procurement, and construction phases spanning multiple decades, with commissioning milestones comparable to those of European XFEL and International Thermonuclear Experimental Reactor. The collaboration model emphasizes international governance, in-kind contributions, and coordinated investment from entities such as CERN Council, national ministries, and scientific agencies including CERN member states and associate members.
Challenges and R&D Priorities
Critical challenges include demonstration of reliable high-gradient accelerating structures, beam stability and alignment at nanometre scales, efficient power management, and scalable industrial production—issues addressed in R&D programs at facilities like CTF3, FLASH, and test sites associated with DESY and SLAC National Accelerator Laboratory. Detector development must advance vertexing, calorimetry, and data acquisition systems building on prototypes used by ATLAS Inner Detector and CMS Tracker groups. Outreach, workforce development, and coordination among institutions such as CERN, Fermilab, KEK, and European universities remain essential to mitigate schedule and budgetary risks.