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Gerry Dugan ILC/GDE and Cornell University SLUO Annual Meeting SLAC Sept. 26, 2005. The ILC Global Design Effort. Formation of the Global Design Effort. Director Barry Barish Appointed in March 2005

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the ilc global design effort

Gerry Dugan

ILC/GDE and Cornell University

SLUO Annual Meeting


Sept. 26, 2005

The ILC Global Design Effort

formation of the global design effort
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


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

the gde plan and schedule

2005 2006 2007 2008 2009 2010

Global Design Effort


Baseline configuration



The GDE Plan and Schedule

Reference Design

Technical Design

ILC R&D Program

Expressions of interest to Host; Site Selection;

International Mgmt


Starting Point for the GDE

Superconducting RF Main Linac

The ILC Global Design Effort

the international technical recommendation panel itrp
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

parameters for the ilc
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

accelerator physics challenges
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

affordability challenges
Affordability challenges


SCRF Linac

The ILC Global Design Effort

gde elements of the near term plan
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

towards a final baseline configuration
Towards a final Baseline Configuration


we are here






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


First ILC workshop at KEK

Nov 13-15, 2004

The ILC Global Design Effort

second ilc accelerator workshop at snowmass aug 2005
Second ILC Accelerator Workshop at Snowmass – Aug 2005


  • 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

the hard questions
The Hard Questions

The ILC Global Design Effort

the hard questions1
The Hard Questions

Many questions are interrelated

The ILC Global Design Effort

the hard questions2
The Hard Questions

Critical choices: luminosity parameters & gradient

The ILC Global Design Effort

luminosity parameters
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

the luminosity plane 2 10 34 cm 2 s 1
The Luminosity Plane 2×1034 cm-2s-1


The ILC Global Design Effort

main linac accelerating gradient
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

gradient baseline recommendation
Gradient-baseline recommendation

* assuming 75% fill factor

Total length of one 500 GeV linac  20km

The ILC Global Design Effort

how do costs scale with gradient
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

r d for baseline gradient
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

r d for upgrade gradient
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

  • 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