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

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

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

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

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

6. RDR Design Parameters Max. Center-of-mass energy 500 GeV
Peak Luminosity
~2x1034
1/cm2s
Beam Current
9.0 mA
Repetition rate 5 Hz
Average accelerating gradient
31.5
MV/m
Beam pulse length
0.95 ms
Total Site Length 31 km
Total AC Power Consumption
~230 MW
24-July ICHEP-10 Paris
Global Design Effort

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 ICHEP-10 Paris
Global Design Effort
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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 ICHEP-10 Paris
Global Design Effort

9. Project Implementation Plan
Five Themes to Develop
Remains special case
Project Implementation Plan
Industrialisation
in-kind contribution models
Site requirements
Project Schedule
Remaining Technical activities
Regional expertise, global Industrialisation
Average accelerating gradient
Cost (cryomodule, mass-production models)
SCRF Technology
Sources
DR (e-cloud)
BDS / MDI
R&D (General)
Consolidation of baseline(s)
Design choices (parameters, layout etc.)
Design work (documentation)
AD&I (CFS)
ICET (schedule tool)
Traceable, defendable
Justification
Cost & Schedule
R&D (and engineering) beyond 2012
Impact (design, cost, schedule)
Mitigation (fall-back solutions)
TDR Risk
>2012
24-July ICHEP-10 Paris
Global Design Effort
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10. Technical Design Phase and Beyond
change control process
AAP
PAC
Physics
TDP Baseline Technical Design
TDR
RDR Baseline
SB2009 evolve
TDP-2
TDP-1
Beijing Workshop
CERN Workshop
Change
Request
RDR Alternate concepts
R&D Demonstrations
AD&I studies
2009
2010
2011
2012
2013
24-July ICHEP-10 Paris
Global Design Effort 10

11. Proposed Design changes for TDR
RDR
SB2009
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 ICHEP-10 Paris
Global Design Effort

12. 7.5 m Diameter Single Tunnel
Egress passageway not needed;
7 m Ø ok
24-July ICHEP-10 Paris
Global Design Effort 12 12

13. 7.5 m Diameter Single Tunnel High-Level RF Solution
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)
24-July 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 ICHEP-10 Paris
Global Design Effort

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Global Design Effort

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Global Design Effort

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Global Design Effort

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Global Design Effort

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

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Global Design Effort

21. Interaction Region
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
(old location)
24-July ICHEP-10 Paris
Global Design Effort 21

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

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