The ILC Global Design Effort

1. Gerry Dugan ILC/GDE and Cornell University SLUO Annual Meeting SLAC Sept. 26, 2005 The ILC Global Design Effort

2. Formation of the Global Design Effort • Director Barry Barish Appointed in March 2005 • Appointed Regional Directors (Gerry Dugan (Americas), Fumihiko Takasaki (Asia), Brian Foster (Europe)) • Three regional directors have identified GDE members (with agreement from BB) • Currently 49 members, representing approximately 20 FTE • GDE group consists of • core accelerator physics experts • 3 CFS experts (1 per region) • 3 costing engineers (1 per region) • 3 communicators (1 per region) • representatives from World Wide Study The ILC Global Design Effort

3. Chris Adolphsen, SLAC Jean-Luc Baldy, CERN Philip Bambade, LAL, Orsay Barry Barish, Caltech (the boss) Wilhelm Bialowons, DESY Grahame Blair, Royal Holloway Jim Brau, University of Oregon Karsten Buesser, DESY Elizabeth Clements, Fermilab Michael Danilov, ITEP Jean-Pierre Delahaye, CERN (EU dep. dir.) Gerald Dugan, Cornell University (Americas dir.) Atsushi Enomoto, KEK Brian Foster, Oxford University (EU dir.) Warren Funk, JLAB Jie Gao, IHEP Terry Garvey, LAL-IN2P3 Hitoshi Hayano, KEK Tom Himel, SLAC Bob Kephart, Fermilab Eun San Kim, Pohang Acc Lab Hyoung Suk Kim, Kyungpook Nat’l Univ Shane Koscielniak, TRIUMF Vic Kuchler, Fermilab Lutz Lilje, DESY Tom Markiewicz, SLAC David Miller, Univ College of London Shekhar Mishra, Fermilab Youhei Morita, KEK Olivier Napoly, CEA-Saclay Hasan Padamsee, Cornell University Carlo Pagani, DESY Nan Phinney, SLAC Dieter Proch, DESY Pantaleo Raimondi, INFN Tor Raubenheimer, SLAC Francois Richard, LAL-IN2P3 Perrine Royole-Degieux, GDE/LAL Kenji Saito, KEK Daniel Schulte, CERN Tetsuo Shidara, KEK Sasha Skrinsky, Budker Institute Fumihiko Takasaki, KEK (Asia dir.) Laurent Jean Tavian, CERN Nobu Toge, KEK Nick Walker, DESY (EU dep. dir.) Andy Wolski, LBL Hitoshi Yamamoto, Tohoku Univ Kaoru Yokoya, KEK 49 members The ILC Global Design Effort

4. 2005 2006 2007 2008 2009 2010 Global Design Effort Project Baseline configuration LHC Physics The GDE Plan and Schedule Reference Design Technical Design ILC R&D Program Expressions of interest to Host; Site Selection; International Mgmt

5. Starting Point for the GDE Superconducting RF Main Linac The ILC Global Design Effort

6. The International Technical Recommendation Panel (ITRP) The recommendation of the ITRP was unanimously endorsed by ICFA on August 20, 2004. • 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). The ILC Global Design Effort

7. Parameters for the ILC • Ecm adjustable from 200 – 500 GeV • Luminosity ∫Ldt = 500 fb-1 in 4 years • Ability to scan between 200 and 500 GeV • Energy stability and precision below 0.1% • Electron polarization of at least 80% • The machine must be upgradeable to 1 TeV The ILC Global Design Effort

8. Accelerator Physics Challenges • Developing efficient high gradient superconducting RF systems • Requires efficient RF systems, capable of accelerating high power beams (~MW) with small beam spots (~nm). • Achieving nm scale high-power 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. The ILC Global Design Effort

9. Affordability challenges Civil SCRF Linac The ILC Global Design Effort

10. GDE – Elements of the Near Term Plan • Baseline/alternate Configuration and Reference Design Report • Continue to define LC Configuration (Snowmass, Aug 05) • Baseline Configuration Document, together with alternatives, by end of 2005 • A structured electronic document, including links to reports, drawings, technical specs, parameter tables, etc. • A ‘printable / readable’ summary document (~100 pages) • Put Baseline under Configuration Control (Jan 06) • By end of 2006, develop 3 volumes -- 1) Reference Design Report; 2) Shorter glossy version for non-experts and policy makers ; 3) Detector Concept Report • Supporting R&D Program • Coordinate worldwide R & D efforts, in order to demonstrate and improve the performance, reduce the costs, attain the required reliability, etc. (Proposal Driven to GDE) The ILC Global Design Effort

11. Towards a final Baseline Configuration 2005 we are here November December September October August Summarize Snowmass results all documented ‘recommendations’ publicly available on www (request community feedback) review by BCD EC BCD EC publishes‘strawman’ BCD BCD Executive Committee (EC): BarishDugan, Foster, Takasaki (regional directors)Raubenheimer, Yokoya, Walker (gang of three) public review Frascati GDE meeting The ILC Global Design Effort

12. First ILC workshop at KEK Nov 13-15, 2004 The ILC Global Design Effort

13. Second ILC Accelerator Workshop at Snowmass – Aug 2005 Goals • Continue process of making a recommendation on aBaseline Configuration • Identify longer-termAlternative Configurations • Identify necessary R&D • For baseline • For alternatives • Priorities for detector R&D The ILC Global Design Effort

14. The Hard Questions The ILC Global Design Effort

15. The Hard Questions Many questions are interrelated The ILC Global Design Effort

16. The Hard Questions Critical choices: luminosity parameters & gradient The ILC Global Design Effort

17. Luminosity Parameters • nominal 500 GeV luminosity: 2×1034 cm-2s-1 • we want to design to a parameter ‘space’, so that the nominal luminosity may be reached from any point in this space. • keep a range of options open to provide • Flexibility • Risk mitigation • Design headroom The ILC Global Design Effort

18. The Luminosity Plane 2×1034 cm-2s-1 =5.6×1034 The ILC Global Design Effort

19. Main Linac Accelerating Gradient • Baseline recommendation for cavity is standard TESLA 9-cell • Alternatives (energy upgrade): • Low-loss, • Re-entrant • superstructure The ILC Global Design Effort

20. Gradient-baseline recommendation * assuming 75% fill factor Total length of one 500 GeV linac  20km The ILC Global Design Effort

21. How do Costs Scale with Gradient? 35 MV/m is close to optimum 30 MV/m would give safety margin Relative Cost Gradient MV/m C. Adolphsen (SLAC) The ILC Global Design Effort

22. R&D for baseline gradient Results from KEK-DESY collaboration must reduce spread (need more statistics) single-cell measurements (in nine-cell cavities) The ILC Global Design Effort

23. R&D for upgrade gradient Cornell: Re-entrant 1.3 GHz cavity Single cell Nb cavity, 70 mm TESLA-like aperture: achieved 46 MV/m at Q = 1010. Hpk = 175.5 mT, Epk = 100 MV/m JLab: Single crystal 2.3 GHz LL cavity Single crystal BCP: surface rms 27 nm. Typical BCP: surface rms 1247 nm, EP: 251 nm Hpk=160.2 mT The ILC Global Design Effort

24. Conclusion • The Global Design Effort has been formed this spring, following the 2004 ITRP technology recommendation. • Design work started at the 2004 KEK workshop has been continued and focused at the recent Snowmass 2005 workshop, and will continue under the guidance of the GDE. • A baseline design for the ILC will be established at the end of 2005, followed by a Reference Design Report and cost estimate during 2006. • Critical R&D issues for the ILC will be identified during 2006. This R&D will be carried out, together with a detailed Technical Design, in subsequent years, to allow construction of the machine starting as early as 2010. The ILC Global Design Effort