ILC Global Design Effort Barry Barish GDE 9

ILC Global Design Effort Barry Barish GDE 9 -March-06 LCWS 06 Bangalore

Global Design Effort (GDE) • On March 18, 2005, during the opening of LCWS 05 workshop at Stanford University, I officially accepted the position of Director of the (yet to be formed) GDE 9 -March-06 LCWS 06 Bangalore 2

Global Design Effort – The Mission of the GDE • Produce a design for the ILC that includes a detailed design concept, performance assessments, reliable international costing, an industrialization plan , siting analysis, as well as detector concepts and scope. • Coordinate worldwide prioritized proposal driven R & D efforts (to demonstrate and improve the performance, reduce the costs, attain the required reliability, etc. ) 9 -March-06 LCWS 06 Bangalore 3

GDE Begins at Snowmass GDE Members Americas 22 Europe 24 Asia 16 9 -March-06 LCWS 06 Bangalore 4

Barish - Snowmass Plenary Talk 9 -March-06 LCWS 06 Bangalore 5

Designing a Linear Collider Superconducting RF Main Linac 9 -March-06 LCWS 06 Bangalore 6

Baseline Configuration Document • Our ‘Deliverable’ by the end of 2005 • A structured electronic document – Documentation (reports, drawings etc) – Technical specs. – Parameter tables 9 -March-06 LCWS 06 Bangalore 7

Structure of the BCD Summary-like overview for those who want to understand the choice and the why Technical documentation of the baseline, for engineers and acc. phys. making studies towards RDR 9 -March-06 LCWS 06 Bangalore 8

Alternatives Section(s) Note ACD is part of the BCD 9 -March-06 LCWS 06 Bangalore 9

The Key Decisions Critical choices: luminosity parameters & gradient 9 -March-06 LCWS 06 Bangalore 10

Making Choices – The Tradeoffs Many decisions are interrelated and require input from several WG/GG groups 9 -March-06 LCWS 06 Bangalore 11

Parametric Approach • A working space - optimize machine for cost/performance 9 -March-06 LCWS 06 Bangalore 12

From Snowmass to a Baseline 2005 Snowmass August September October November December WW/GG summaries Response to list of 40+ decisions All documented ‘recommendations available on ILC Website (request community feedback) Review by BCD EC BCD Executive Committee: Barish Dugan, Foster, Takasaki Raubenheimer, Yokoya, Walker 9 -March-06 BCD EC publishes ‘strawman’ BCD Public Review LCWS 06 Bangalore Frascati GDE meeting 13

The Baseline Machine (500 Ge. V) ~30 km RTML ~1. 6 km 20 mr 2 mr ML ~10 km (G = 31. 5 MV/m) BDS 5 km e+ undulator @ 150 Ge. V (~1. 2 km) x 2 R = 955 m E = 5 Ge. V not to scale 9 -March-06 LCWS 06 Bangalore 14

Electron Source • DC Guns incorporating photocathode illuminated by a Ti: Sapphire drive laser. • Long electron microbunches (~2 ns) are bunched in a bunching section • Accelerated in a room temperature linac to about 100 Me. V and SRF linac to 5 Ge. V. laser E=70 -100 Me. V Positron-style roomstandard ILC temperature SCRF modules accelerating section diagnostics section sub-harmonic bunchers + solenoids 9 -March-06 LCWS 06 Bangalore 15

Positron Source Helical Undulator Based Positron Source with Keep Alive System Primary esource Beam Delivery System e. DR 150 Ge. V 100 Ge. V Helical Undulator In By-Pass Line Auxiliary e. Source Photon Collimators Positron Linac IP 250 Ge. V e+ DR Target e. Dump Photon Beam Dump Photon Target Adiabatic Matching Device e+ preaccelerator ~5 Ge. V Keep Alive: This source would have all bunches filled to 10% of nominal intensity. 9 -March-06 LCWS 06 Bangalore 16

ILC Small Damping Ring Multi-Bunch Trains with inter-train gaps 9 -March-06 LCWS 06 Bangalore 17

ILC Damping Ring: Baseline Design • Positrons: – Two rings of ~6 km circumference in a single tunnel. – Two rings are needed to reduce ecloud effects unless significant progress can be made with mitigation techniques. – Preferred to 17 km dogbone due to: • Space-charge effects • Acceptance • Tunnel layout (commissioning time, stray fields) • Electrons: – One 6 km ring. 9 -March-06 LCWS 06 Bangalore 18

Main Linac: SRF Cavity Gradient Cavity type initial upgrade Qualified gradient Operational gradient Length* energy MV/m Km Ge. V TESLA 35 31. 5 10. 6 250 LL 40 36. 0 +9. 3 500 Total length of one 500 Ge. V linac 20 km 9 -March-06 LCWS 06 Bangalore * assuming 75% fill factor 19

Cavity: R&D • Material R&D: Fine, Large, Single Crystal • Fabrication – A number of minor modifications and improvements could be implemented without impact to the basic cavity design. • Cavity Preparation • Buffer Chemical Processing • Cavity Processing (strong R&D needed) – Electro-polishing (EP) System – High Pressure Rinsing (HPR) – Assembly Procedure 9 -March-06 LCWS 06 Bangalore 20

Superconducting RF Cavities High Gradient Accelerator 35 MV/meter -- 40 km linear collider 9 -March-06 LCWS 06 Bangalore 21

Improved Processing Electropolishing Chemical Polish Electro Polish 9 -March-06 LCWS 06 Bangalore 22

RF Power: Modulator Baseline Alternate Operation: an array of capacitors is charged in parallel, discharged in series. (~2 m) The Bouncer Compensated Pulse Transformer Style Modulator 9 -March-06 Will test full prototype in 2006 LCWS 06 Bangalore 23

RF Power: Baseline Klystrons Specification: 10 MW MBK 1. 5 ms pulse 65% efficiency Thales 9 -March-06 CPI LCWS 06 Bangalore Toshiba 24

ILC Cryomodule Increase diameter beyond X-FEL Review 2 -phase pipe size and effect of slope 9 -March-06 LCWS 06 Bangalore 25

ILC Beam Delivery System • Baseline – two BDSs, 20/2 mrad, 2 detectors, 2 longitudinally separated IR halls • Alternative 1 – two BDSs, 20/2 mrad, 2 detectors in single IR hall @ Z=0 • Alternative 2 – single IR/BDS, collider hall long enough for two push-pull detectors 9 -March-06 LCWS 06 Bangalore 26

ILC Siting and Conventional Facilities • The design is intimately tied to the features of the site – 1 tunnels or 2 tunnels? – Deep or shallow? – Laser straight linac or follow earth’s curvature in segments? • GDE ILC Design will be done to samples sites in the three regions 9 -March-06 LCWS 06 Bangalore 27

The GDE after Six Months • How have we done? – We are on track – BCD produced by end of 2005 as promised. It will provide a sound basis for entering into a reference design effort, globally coordinate R&D program, begin industrialization, determine costs, etc. next year • What’s Next? – Undertaking Design/Cost effort toward Reference Design Report (RDR) – Assessing present R&D program to begin to provide global guidance in the future. 9 -March-06 LCWS 06 Bangalore 28

Next Goal – Reference Design • Reorganized the GDE toward Design / Cost Effort • A global effort to design / cost the ILC is underway and working • Configuration Control; International Costing; Industrialization; Siting ------------- • A sound design must be established with convincing and affordable costing. • Global R&D program to demonstrate the ILC, improve over the baseline and reduce costs. 9 -March-06 LCWS 06 Bangalore 29

GDE RDR / R&D Organization FALC ICFA FALC Resource Board ILCSC GDE Directorate GDE Executive Committee GDE R & D Board GDE Change Control Board Global R&D Program 9 -March-06 LCWS 06 Bangalore GDE Design Cost Board RDR Design Matrix 30

GDE RDR / R&D Organization Reporting ICFA technical FALC Resource Board ILCSC resources GDE Directorate GDE Executive Committee GDE R & D Board GDE Change Control Board Global R&D Program 9 -March-06 LCWS 06 Bangalore GDE Design Cost Board RDR Design Matrix 31

GDE RDR / R&D Organization FALC ICFA FALC Resource Board ILCSC GDE Directorate GDE Executive Committee GDE R & D Board GDE Change Control Board Global R&D Program 9 -March-06 LCWS 06 Bangalore GDE Design Cost Board RDR Design Matrix 32

GDE RDR / R&D Organization FALC ICFA FALC Resource Board ILCSC GDE Directorate GDE Executive Committee GDE R & D Board ILC R&D Program 9 -March-06 GDE Change Control Board Global R&D Program LCWS 06 Bangalore GDE Design Cost Board RDR Design Matrix ILC Design Effort 33

Cost Roll-ups Area Systems ee+ damping source rings RTML main linac BDS Technical Systems Vacuum systems Magnet systems Cryomodule Cavity Package RF Power Instrumentation Dumps and Collimators Accelerator Physics Global Systems Commissioning, Operations & Reliability Control System Cryogenics CF&S 9 -March-06 LCWS 06 Bangalore 34

From Baseline to a RDR July Jan Frascati Bangalore Vancouver 2006 Dec Valencia Freeze Configuration Organize for RDR Review Design/Cost Methodology Review Initial Design / Cost Design and Costing 9 -March-06 LCWS 06 Bangalore Review Final Design / Cost RDR Document Preliminary RDR Released 35

Internationl Linear Collider Timeline 2005 2006 2007 2008 2009 2010 Global Design Effort Project Baseline configuration Reference Design Technical Design ILC R&D Program Expression of Interest to Host International Mgmt 9 -March-06 LCWS 06 Bangalore

Conclusions • The baseline configuration for the ILC has been established and is document in the BCD (a 700+ page electronic document) • We have put the BCD under configuration control and are evolving it now in a controlled manner • The BCD also defines alternatives and the combination of the baseline and alternative will give good guidance for the ILC R&D program • The BCD is now being used as the reference and basis for the reference design / cost effort this year. This is a much tougher job! 9 -March-06 LCWS 06 Bangalore 37