24-July-10 ICHEP-10 Paris Global Design Effort 1 Barry Barish Paris ICHEP 24-July-10 ILC Global Design Effort

24-July-10 ICHEP-10 Paris Global Design Effort 2 The linear collider will measure the spin of any Higgs it can produce by measuring the energy dependence from threshold Linear Collider – Higgs Physics Measure the quantum numbers. The Higgs must have spin zero !

24-July-10 ICHEP-10 Paris Global Design Effort 3 Precision measurements of Higgs coupling Higgs Coupling strength is proportional to Mass Linear Collider – Higgs Physics

24-July-10 ICHEP-10 Paris Global Design Effort 4 determine the underlying model SM 2HDM/MSSM Yamashita et al Zivkovic et al Linear Collider – Higgs Physics

24-July-10 ICHEP-10 Paris Global Design Effort 5 RDR Complete Reference Design Report (4 volumes) Executive Summary Physics at the ILC Accelerator Detectors

24-July-10 ICHEP-10 Paris Global Design Effort 6 RDR Design Parameters Max. Center-of-mass energy500GeV Peak Luminosity~2x /cm 2 s Beam Current9.0mA Repetition rate5Hz Average accelerating gradient31.5MV/m Beam pulse length0.95ms Total Site Length31km Total AC Power Consumption~230MW

24-July-10 ICHEP-10 Paris Global Design Effort 7 7 Major R&D Goals for Technical Design Accelerator Design and Integration (AD&I) Studies of possible cost reduction designs and strategies for consideration in a re-baseline in 2010 SCRF High Gradient R&D - globally coordinated program to demonstrate gradient by 2010 with 50%yield; ATF-2 at KEK Demonstrate Fast Kicker performance and Final Focus Design Electron Cloud Mitigation – (CesrTA) Electron Cloud tests at Cornell to establish mitigation and verify one damping ring is sufficient.

24-July-10 ICHEP-10 Paris Global Design Effort 8 Why change from RDR design? Timescale of ILC demands we continually update the technologies and evolve the design to be prepared to build the most forward looking machine at the time of construction. Our next big milestone – the technical design (TDR) at end of 2012 should be as much as possible a “construction project ready” design with crucial R&D demonstrations complete and design optimised for performance to cost to risk. Cost containment vs RDR costs is a crucial element. (Must identify costs savings that will compensate cost growth)

24-July-10 ICHEP-10 Paris Global Design Effort 9 9 Five Themes to Develop >2012 Remains special case Project Implementation Plan Industrialisation in-kind contribution models Site requirements Project Schedule Remaining Technical activities

24-July-10 ICHEP-10 Paris Global Design Effort 10 Technical Design Phase and Beyond AD&I studies RDR Alternate concepts R&D Demonstrations TDP Baseline Technical Design RDR Baseline Beijing Workshop TDR TDP-1 TDP-2 Change Request SB2009 evolve change control process AAP PAC Physics CERN Workshop

24-July-10 ICHEP-10 Paris Global Design Effort 11 Proposed Design changes for TDR RDRSB2009 Single Tunnel for main linac Move positron source to end of linac *** Reduce number of bunches factor of two (lower power) ** Reduce size of damping rings (3.2km) Integrate central region Single stage bunch compressor

24-July-10 ICHEP-10 Paris Global Design Effort m Diameter Single Tunnel Egress passageway not needed; 7 m Ø ok

24-July-10 ICHEP-10 Paris Global Design Effort 13 Critical technical challenge for one-tunnel option is the high level RF distribution. Two proposed solutions : –Distributed RF Source (DRFS) Small 750kW klystrons/modulators in tunnel One klystron per four cavities ~1880 klystrons per linac Challenge is cost and reliability –Klystron Cluster Scheme (KCS) RDR-like 10 MW Klystrons/modulators on surface Surface building & shafts every ~2 km Challenge is novel high-powered RF components (needs R&D) 7.5 m Diameter Single Tunnel High-Level RF Solution

24-July-10 ICHEP-10 Paris Global Design Effort 14 The ILC SCRF Cavity - Achieve high gradient (35MV/m); develop multiple vendors; make cost effective, etc - Focus is on high gradient; production yields; cryogenic losses; radiation; system performance

24-July-10 ICHEP-10 Paris Global Design Effort 15

24-July-10 ICHEP-10 Paris Global Design Effort 16

24-July-10 ICHEP-10 Paris Global Design Effort 17

24-July-10 ICHEP-10 Paris Global Design Effort 18

24-July-10 ICHEP-10 Paris Global Design Effort 19 Cornell E Cloud Studies

24-July-10 ICHEP-10 Paris Global Design Effort 20

24-July-10 ICHEP-10 Paris Global Design Effort 21 Interaction Region (old location) Break point for push-pull disconnect Provide reliable collisions of 5nm-small beams, with acceptable level of background, and be able to rapidly and efficiently exchange ~10kT detectors in a push-pull operation several times per year

24-July-10 ICHEP-10 Paris Global Design Effort 22 Push – Pull Detector Concept Vibration stability will be one of the major criteria in eventual selection of a motion system design Both detectors without platformsBoth detectors with platforms

24-July-10 ICHEP-10 Paris Global Design Effort 23 Global Design Effort 23 Timescales: TDR to ILC (or beyond 2012) Steps to a Project – Technical (2-3 years) –R&D for Risk Reduction and Technology Improvement –Systems Tests (e.g. S2 completion – ILC-like beam tests) –Engineering Design –Industrialization Project Implementation –Government Agreements for International Partnership –Siting and site-dependent design –Governance Time to Construct –5-6 years construction –2 years commissioning Project Proposal / Decision keyed to LHC results ILC Could be doing physics by early to mid- 2020s

24-July-10 ICHEP-10 Paris Global Design Effort 24 Final Remarks ILC accelerator R&D and design evolution is on track for Technical Design Report at end of This will be accompanied a Project Implementation Plan Planning for ILC development beyond 2012 is very important. It will be very difficult to maintain viable support until a decision will be made. LHC will open the TeV energy frontier and the resulting physics will point our way to the future ---- (Linear Collider or ???). We are preparing to make the ILC option as a viable and well prepared and understood option.