1. International Linear Collider Report from the GDE Director
Barry Barish
ICFA Seminar
Daegu, Korea
29-Aug-05

2. ICFA Seminar - Daegu, Korea
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.)
29-Sept-05
ICFA Seminar - Daegu, Korea

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).
29-Sept-05
ICFA Seminar - Daegu, Korea

4. 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
29-Sept-05
ICFA Seminar - Daegu, Korea

5. ICFA Seminar - Daegu, Korea
The Community Self-Organized
Nov 13-15, 2004
29-Sept-05
ICFA Seminar - Daegu, Korea

6. Self Organization following Technology Decision
1st ILC workshop at KEK November 2005
ILCSC forms 5 technical WG + 1 communications and outreach WG
WG1 Parameters & General Layout
WG2 Main Linac
WG3 Injectors
WG4 Beam Delivery & MDI
WG5 High gradient SCRF
WG6 Communications
29-Sept-05
ICFA Seminar - Daegu, Korea

7. ICFA Seminar - Daegu, Korea
Evolution by Snowmass
Birth of the GDE
and Preparation for Snowmass
WG1 LET beam dynamics
WG2 Main Linac
WG3a Sources
WG3b Damping Rings
WG4 Beam Delivery
WG5 SCRF Cavity Package
WG6 Communications
WG1 Parms & layout
WG2 Linac
WG3 Injectors
WG4 Beam Delivery
WG5 High Grad. SCRF
WG6 Communications
29-Sept-05
ICFA Seminar - Daegu, Korea

8. ICFA Seminar - Daegu, Korea
GDE Members
Chris Adolphsen, SLAC
Jean-Luc Baldy, CERN
Philip Bambade, LAL, Orsay
Barry Barish, Caltech
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,
Gerald Dugan, Cornell University
Atsushi Enomoto, KEK
Brian Foster, Oxford University
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
Laurent Jean Tavian, CERN
Nobu Toge, KEK
Nick Walker, DESY
Andy Wolski, LBL
Hitoshi Yamamoto, Tohoku Univ
Kaoru Yokoya, KEK
49 members
Americas 16
Europe
Asia
29-Sept-05
ICFA Seminar - Daegu, Korea

9. ICFA Seminar - Daegu, Korea
Starting Point for the GDE
Superconducting RF Main Linac
29-Sept-05
ICFA Seminar - Daegu, Korea

10. ICFA Seminar - Daegu, Korea
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
29-Sept-05
ICFA Seminar - Daegu, Korea

11. The GDE Plan and Schedule
CLIC
Global Design Effort
Project
LHC
Physics
Baseline configuration
Reference Design
Technical Design
ILC R&D Program
Expression of Interest to Host
International Mgmt

12. 670 Scientists attended two week workshop ICFA Seminar - Daegu, Korea
Review of Snowmass
670 Scientists attended two week workshop at
Snowmass
29-Sept-05
ICFA Seminar - Daegu, Korea

13. Enter the GDE - Snowmass
Birth of the GDE
and Preparation for Snowmass
WG1 LET beam dynamics
WG2 Main Linac
WG3a Sources
WG3b Damping Rings
WG4 Beam Delivery
WG5 SCRF Cavity Package
WG6 Communications
GG1 Parameters & Layout
GG2 Instrumentation
GG3 Operations & Reliability
GG4 Cost Engineering
GG5 Conventional Facilities
GG6 Physics Options
WG1 Parms & layout
WG2 Linac
WG3 Injectors
WG4 Beam Delivery
WG5 High Grad. SCRF
WG6 Communications
Introduction of Global Groups
transition workshop → project
29-Sept-05
ICFA Seminar - Daegu, Korea

14. GDE Organization for Snowmass
WG1 LET bdyn.
WG2 Main Linac
WG3a Sources
WG3b DR
WG4 BDS
WG5 Cavity
Technical sub-system
Working Groups
Provide input
Global Group
GG1 Parameters
GG2 Instrumentation
GG3 Operations & Reliability
GG4 Cost & Engineering
GG5 Conventional Facilities
GG6 Physics Options
29-Sept-05
ICFA Seminar - Daegu, Korea

15. Goals of the Snowmass Workshop
Recommendations for the Baseline Configuration
Identify - Alternative Configurations
Identify R&D
To support the baseline
To develop the alternatives
Priorities for detector R&D
29-Sept-05
ICFA Seminar - Daegu, Korea

16. Guidance for Baseline Configuration
Baseline: A forward looking configuration which we are reasonably confident can achieve the required performance and can be used to give a reasonably accurate cost estimate by mid-end 2006 in a “Reference Design Report.”
29-Sept-05
ICFA Seminar - Daegu, Korea

17. What are Alternatives and Why?
Alternates: Technologies or concepts, which may provide a significant cost reduction, improved performance (or both), but which will not be mature enough to used in baseline by end Alternatives will be part of the RDR, will form an important element in the R&D program and are the key to evolving the design
29-Sept-05
ICFA Seminar - Daegu, Korea

18. Baseline Configuration Document
Our ‘Deliverable’ by the end of 2005
A structured electronic document
Documentation (reports, drawings etc)
Technical specs.
Parameter tables …
A ‘printable / readable’ summary document (~100 pages)
29-Sept-05
ICFA Seminar - Daegu, Korea

19. ICFA Seminar - Daegu, Korea
Design Approach
Create a baseline configuration for the machine
Document a concept for ILC machine with a complete layout, parameters etc. defined by the end of 2005
Make forward looking choices, consistent with attaining performance goals, and understood well enough to do a conceptual design and reliable costing by end of 2006.
Technical and cost considerations will be an integral part in making these choices.
Baseline will be put under “configuration control,” with a defined process for changes to the baseline.
A reference design will be carried out in I am proposing we use a “parametric” design and costing approach.
Technical performance and physics performance will be evaluated for the reference design
29-Sept-05
ICFA Seminar - Daegu, Korea

20. ICFA Seminar - Daegu, Korea
Parametric Approach
Parametric approach to design
machine parameters : a space to optimize the machine
Trial parameter space, being evaluated by subsystems
machine design : incorporate change without redesign; incorporates value engineering, trade studies at each step to minimize costs
29-Sept-05
ICFA Seminar - Daegu, Korea

21. Approach to ILC R&D Program
Proposal-driven R&D in support of the baseline design.
Technical developments, demonstration experiments, industrialization, etc.
Proposal-driven R&D in support of alternatives to the baseline
Proposals for potential improvements to the baseline, resources required, time scale, etc.
Develop a prioritized DETECTOR R&D program aimed at technical developments needed to reach combined design performance goals
29-Sept-05
ICFA Seminar - Daegu, Korea

22. ICFA Seminar - Daegu, Korea
The Key Decisions
Critical choices: luminosity parameters & gradient
29-Sept-05
ICFA Seminar - Daegu, Korea

23. Making Choices – The Tradeoffs
Many decisions are interrelated and require input from several WG/GG groups
29-Sept-05
ICFA Seminar - Daegu, Korea

24. 17km “Dogbone” Damping Ring
The length of the TESLA damping ring and the idea of the dogbone shape (to save tunnel length) were driven by the unavailability of ultra fast kickers.
17 Km were needed to accommodate ~3000 bunches with 20 ns bunch distance, which, for the TESLA TDR, was considered a feasible value for the rise/fall time of the kickers.
29-Sept-05
ICFA Seminar - Daegu, Korea

25. The Development of Fast Kickers
Several different types of fast pulsers have been tested on a strip line kicker at ATF (KEK). All have very short rise/fall time (~3ns) and fulfill nearly all of the requirements for the damping ring injection/extraction.
The Snowmass Damping Ring working group assessment is:
The kickers for a 6 Km (i.e. 6 ns bunch spacing) are a “low risk” issue
The kickers for the 3 Km ring are considered at present a “high risk”.
Rise time~3.2ns
Kick angle ~85mrad
(calc. 94.7mrad)
29-Sept-05
ICFA Seminar - Daegu, Korea

26. Circular (or Race Track) Damping Rings
Considering Km ring in an independent tunnel
The efficiency of commissioning and operation would be improved
The effects of the stray fields in the linac tunnel, possibly limiting the ultra low vertical emittance would be eliminated.
A 6 Km ring would also have reduced space charge effects
But, e-cloud, Ion Effects and Classical Instabilities have a crucial dependence on bunch distance and current. Studies …
29-Sept-05
ICFA Seminar - Daegu, Korea

27. Span the configuration space
Reference Lattices
Lattice Name
Energy [GeV]
Circumference [m]
Cell Type
PPA
5.0
2824 PI
OTW
3223
TME
OCS
6114
BRU
3.7
6333
FODO
MCH
15935
DAS
17014
TESLA
17000
Span the configuration space
29-Sept-05
ICFA Seminar - Daegu, Korea

28. Dynamic Aperture Studies
NAME
C (km)
E (Gev)
sz (mm)
DA (sinj)
d=0%
d=0.5%
d=1.0%
<DA> (sinj)
PPA 3 5 6
7.65
6.57
4.05
6.09
OCS
5.25
4.74
4.40
4.80
BRU
3.74 9
4.21
3.76
2.59
3.52
TESLA 17
3.62
2.11
1.11
2.28
MCH 16
4.58
4.01
2.66
3.75
DAS
4.89
3.38
2.40
3.55
29-Sept-05
ICFA Seminar - Daegu, Korea

29. Comparative Studies Underway
Jitter
Hardware Costs
29-Sept-05
ICFA Seminar - Daegu, Korea

30. 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)
Redo!!!
Review by BCD EC
BCD EC publishes ‘strawman’ BCD
BCD Executive Committee:
Barish Dugan, Foster, Takasaki Raubenheimer, Yokoya, Walker
Public
Review
Frascati
GDE
meeting
29-Sept-05
ICFA Seminar - Daegu, Korea

31. ICFA Seminar - Daegu, Korea
Conclusions
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 technology
start the global design effort
funding agencies are engaged
Many major hurdles remain before the ILC becomes a reality (funding, site, international organization, and most importantly, a technical design and construction plan)
The time scale for ILC technical project readiness is consistent with proposing a construction project before the end of this decade.
29-Sept-05
ICFA Seminar - Daegu, Korea