The CLIC annual workshop highlights technology maturity and increased use ahead of the European Strategy update

Report from the CLIC workshop

and | 1 February 2018

More than 200 people attended this year's CLIC workshop. Image: Matteo Volpi / CERN

More than 200 people attended this year’s CLIC workshop. Image: Matteo Volpi / CERN








The Compact Linear Collider (CLIC) workshop is the main annual gathering of the CLIC accelerator and detector communities, and this year attracted more than 220 participants to CERN between 22 and 26 January. This meeting focused on preparations for the Update of the European Strategy for Particle Physics.

The initial CLIC energy stage at 380 GeV is optimised to provide high-precision Higgs boson and top-quark measurements, with the higher-energy stages enhancing the sensitivity to effects from beyond-Standard Model (BSM) physics. Following a 2017 publication on Higgs physics, the workshop heard reports on recent developments in top-quark physics and the BSM potential at CLIC, both of which are attracting significant interest from the theory community.

Speakers also reported extensive progress in the validation and performance of the new detector model. To ensure that the detector’s performance meets the challenging specifications, a new approach to tracking has been commissioned, and the particle flow analysis and flavour-tagging capabilities have been consolidated.  Updates were presented on the broad and active R&D programme on the vertex and tracking detectors, which aims to find technologies that simultaneously fulfil all the CLIC requirements. Reports were given on test beam campaigns with both hybrid and monolithic assemblies, and on ideas for future developments.  Many of the tracking and calorimeter technologies under study for the CLIC detector are also of interest to the HL-LHC, where the high granularity and time resolution needed for CLIC are equally crucial.

For the accelerator, studies with the aim of reducing the cost and power have particular priority. This makes the initial CLIC stage a project that requires resources comparable to what was needed for LHC. Key activities in this context are high-efficiency radio frequency (RF) systems, permanent magnets studies, optimised accelerator structures and overall implementation studies related to civil engineering, infrastructure, schedules and tunnel layout.

A key aspect of the ongoing accelerator development is moving towards industrialisation of the component manufacture, by fostering wider applications of the CLIC 12-GHz X-band technology with external partners.  As a new initiative, the CLIC Workshop saw the kick-off meeting for the CompactLight project recently funded by the European Commission’s Horizon 2020 programme.  This three-year project brings together leading European institutions and companies to design an optimised X-ray free-electron laser based on X-band technology, to pave the way for significantly more compact and power-efficient accelerator facilities.

2017 also saw the realisation of the CERN Linear Electron Accelerator for Research (CLEAR), a new user facility for accelerator R&D whose programme includes CLIC high-gradient and instrumentation studies [].  Presentations at the workshop addressed the programmes for instrumentation and radiation studies, plasma-lensing, wakefield monitors and high energy electrons for cancer therapy.

This year the CLIC accelerator and detector and physics collaborations will prepare summary reports as input for the Update of the European Strategy for Particle Physics focusing on the 380-GeV initial CLIC project implementation. These will also include plans for the project preparation phase in 2020-25.

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