The ILC Outlook Barry Barish HEP 2005 Joint ECFA-EPS Lisbon, Portugal 23-July-05

22-July-05 HEP Barish 2 International Technology Review Panel

22-July-05 HEP Barish 3 The ITRP Recommendation We recommend that the linear collider be based on superconducting rf technology –This recommendation is made with the understanding that we are recommending a technology, not a design. We expect the final design to be developed by a team drawn from the combined warm and cold linear collider communities, taking full advantage of the experience and expertise of both (from the Executive Summary).

22-July-05 HEP Barish 4 The SCRF Technology Recommendation The recommendation of ITRP was presented to ILCSC & ICFA on August 19, 2004 in a joint meeting in Beijing. ICFA unanimously endorsed the ITRP’s recommendation on August 20, 2004

22-July-05 HEP Barish 5 Starting Point for the GDE Superconducting RF Main Linac

22-July-05 HEP Barish 6 The Community then Self-Organized Nov 13-15, 2004

The Global Design Effort Formal organization begun at LCWS 05 at Stanford in March 2005 when I became director of the GDE Technically Driven Schedule

22-July-05 HEP Barish 8 GDE – Near Term Plan Schedule Begin to define Configuration (Aug 05) Baseline Configuration Document by end of Put Baseline under Configuration Control (Jan 06) Develop Reference Design Report by end of 2006 Three volumes -- 1) Reference Design Report; 2) Shorter glossy version for non-experts and policy makers ; 3) Detector Concept Report

22-July-05 HEP Barish 9 Snowmass Workshop – Aug 2005

22-July-05 HEP Barish 10 Snowmass – GDE Takes Over

22-July-05 HEP Barish 11 Key Near-Term Design Choices Accelerating Gradient Positron Production mechanism Design of Damping ring Site-specific considerations: One or two tunnels? Shallow or deep?, etc Total cost will be a key determining factor in our ability to get the ILC built. Therefore cost optimization of all systems is of primary importance

22-July-05 HEP Barish 12 Accelerator Physics Challenges Develop High Gradient Superconducting RF systems –Requires efficient RF systems, capable of accelerating high power beams (~MW) with small beam spots(~nm). Achieving nm scale beam spots –Requires generating high intensity beams of electrons and positrons –Damping the beams to ultra-low emittance in damping rings –Transporting the beams to the collision point without significant emittance growth or uncontrolled beam jitter –Cleanly dumping the used beams. Reaching Luminosity Requirements –Designs satisfy the luminosity goals in simulations –A number of challenging problems in accelerator physics and technology must be solved, however.

22-July-05 HEP Barish 13 Three concepts under study Typically requires factors of two improvement in granularity, resolution, etc. from present generation detectors Focused R&D program required to develop the detectors -- end of 2005 Detector Concepts will be used to simulate performance of reference design vs physics goals next year. Detector Concepts and Challenges

22-July-05 HEP Barish 14 Remarkable progress in the past two years toward realizing an international linear collider: important R&D on accelerator systems definition of parameters for physics choice of main linac technology start the global design effort funding agencies are engaged  Many major hurdles remain before the ILC becomes a reality (funding, site, international organization, detailed design, …), but there is increasing momentum toward the ultimate goal --- An International Linear Collider. Conclusions