The Compact Linear Collider (CLIC) - 2018 Summary Report

The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear $e^+e^-$ collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an overview of the CLIC project, its current status, and future developments. It presents the CLIC physics potential and reports on design, technology, and implementation aspects of the accelerator and the detector. CLIC is foreseen to be built and operated in stages, at centre-of-mass energies of 380 GeV, 1.5 TeV and 3 TeV, respectively. CLIC uses a two-beam acceleration scheme, in which 12 GHz accelerating structures are powered via a high-current drive beam. For the first stage, an alternative with X-band klystron powering is also considered. CLIC accelerator optimisation, technical developments and system tests have resulted in an increased energy efficiency (power around 170 MW) for the 380 GeV stage, together with a reduced cost estimate at the level of 6 billion CHF. The detector concept has been refined using improved software tools. Significant progress has been made on detector technology developments for the tracking and calorimetry systems. A wide range of CLIC physics studies has been conducted, both through full detector simulations and parametric studies, together providing a broad overview of the CLIC physics potential. Each of the three energy stages adds cornerstones of the full CLIC physics programme, such as Higgs width and couplings, top-quark properties, Higgs self-coupling, direct searches, and many precision electroweak measurements. The interpretation of the combined results gives crucial and accurate insight into new physics, largely complementary to LHC and HL-LHC. The construction of the first CLIC energy stage could start by 2026. First beams would be available by 2035, marking the beginning of a broad CLIC physics programme spanning 25-30 years

Typical surface finish of the CMS magnet conductor pieces, before and after machining on the electron Beam Welding line at Techmeta

Each conductor piece is 2550m long, continuously EB welded

Ultrasonic monitoring on the Electron Beam Welding line at Techmeta during manufacturing of the CMS magnet conductor.

The ultrasonic non-destructive method allows testing the EBW interface high-strength aluminium alloy / high-purity aluminium. The testing technique implemeted by EMPA is a Phased array system amplitude C-scan with immersion pulse-echo-technique

Summary of the Workshop on Superconducting Detector Magnets

A ‘Superconducting Detector Magnets Workshop’ took place at CERN from September 12-14, 2022, bringing together the physics community, magnet designers and industry with the purpose to exchange about the future needs and efforts to be achieved in research and development in order to build the next magnet generations for Future Colliders and Beyond Collider Physics Experiments.The industrial capacities and their availabilities, with the foreseen prospects and plans, were addressed and representatives of industry working on all aspects of superconducting detector magnets were given. A topic of particular importance addressed was the availability of aluminium-stabilized Nb-Ti/Cu conductors.The workshop provided a forum for the exchange of ideas, concepts, and best practices, to advance on superconducting detector magnet technologies and to foster collaboration.In the seminar the key points coming out from the workshop will be summarised.</p

Dual beam delivery system serving two interaction regions for the Compact Linear Collider

International audienceThe Compact Linear Collider (CLIC) could provide $e^+e^−$ collisions in two detectors simultaneously possibly at a bunch train frequency in the linac twice the baseline design value. In this paper, a novel dual beam delivery system (BDS) design is presented in order to serve two interaction regions (IR1 and IR2) including optics designs and the evaluation of luminosity performance with synchrotron radiation (SR) and solenoid effects for both energy stages of CLIC, 380 GeV and 3 TeV. IR2 features a larger crossing angle than the current baseline. The luminosity performance of the novel CLIC scheme was evaluated by comparing the different BDS designs with and without the detector solenoid field effects. It has to be highlighted that the impact of the detector solenoid on luminosity had not been evaluated for the current CLIC baseline, which amounts to a loss of about 4% that corresponds to the same value of the old baseline design. At 380 GeV the novel dual BDS design features same luminosities than the current baseline. However at 3 TeV the luminosity performance is reduced by 2% from the baseline design for the IR1 and by 33% for the IR2. The dual CLIC BDS design provides adequate luminosities to two detectors and proves to be a viable candidate for future linear collider projects