General Infrastructure Services

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Tunnel implementations (laser straight)Central MDI & Interaction RegionCLIC near CERN1

2Physics at LC from 250 GeV to 3000 GeVPhysics case for the Linear Collider:Higgs physics (SM and non-SM)TopSUSYHiggs strong interactionsNew Z sectorContact interactionsExtra dimensions. AOP (any other physics)

Specific challenges for CLIC studies: Need to address Higgs-studies, including gains for measurements at higher energies Reach for various new physics (list above) options; comparative studies with HiLumi LHC and proton-proton at higher energies (FCC).

References:CLIC CDR andhttp://arxiv.org/pdf/hep-ex/0112004.pdf, see also talk S.Dawson2

140 ms train length - 24 24 sub-pulses4.2 A - 2.4 GeV 60 cm between bunches240 ns 24 pulses 101 A 2.5 cm between bunches240 ns5.8 msDrive beam time structure - initialDrive beam time structure - final

Possible CLIC stages studied4

Key features: High gradient (energy/length)Small beams (luminosity)Repetition rates and bunch spacing (experimental conditions)5Key results of CDR studies

2013-18 Development PhaseDevelop a Project Plan for a staged implementation in agreement with LHC findings; further technical developments with industry, performance studies for accelerator parts and systems, as well as for detectors.

2018-19 DecisionsOn the basis of LHC dataand Project Plans (for CLIC and other potential projects), take decisions about next project(s) at the Energy Frontier.4-5 year Preparation PhaseFinalise implementation parameters, Drive Beam Facility and other system verifications, site authorisation and preparation for industrial procurement. Prepare detailed Technical Proposals for the detector-systems. 2024-25 Construction StartReady for full construction and main tunnel excavation. Construction Phase Stage 1 construction of CLIC, in parallel with detector construction.Preparation for implementation of further stages. Commissioning Becoming ready for data-taking as the LHC programme reaches completion.

Critical issues for next phase:Design and Implementation studies:CDR status: not optimized except at 3 TeV and not adjusted for Higgs discovery, not optimized cost, first power/energy estimates without time for reductions, limited industrial costing, very limited reliability studiesX-band developments:CDR status: Single elements demonstrated limited by test-capacitySystem-tests:CDR status: CTF3 results initial phase (as of early 2012), ATF and FACET very little, no convincing strategy for further system verification, programmes for use of Xband techology for other applications in its infancy CDR status concerning drive-beam FE: Nothing done beyond CTF3 Technology developments:CDR status: alignment/stability partly covered, BBA assumed, wakefield mon. perf. assumed, no complete module

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29 Countries over 70 Institutes

AcceleratorcollaborationDetectorcollaborationAccelerator + Detector collaborationCLIC Collaboration