ILC-GDE The ILC Global Design Effort Gerry Dugan ILC/GDE and Cornell University SLUO Annual Meeting...

ILC-GDE

The ILC Global Design Effort

Gerry DuganILC/GDE and

Cornell University

SLUO Annual Meeting

SLAC Sept. 26, 2005

Sept. 26, 2005 The ILC Global Design Effort 2

ILC-GDEFormation of the

Global Design Effort

• Director Barry Barish Appointed in March 2005 • Appointed Regional Directors (Gerry Dugan (Americas), Fumihiko Appointed Regional Directors (Gerry Dugan (Americas), Fumihiko

Takasaki (Asia), Brian Foster (Europe))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


ILC-GDE

Chris Adolphsen, SLACJean-Luc Baldy, CERNPhilip Bambade, LAL, OrsayBarry Barish, Caltech (the boss)Wilhelm Bialowons, DESYGrahame Blair, Royal HollowayJim Brau, University of OregonKarsten Buesser, DESYElizabeth Clements, FermilabMichael Danilov, ITEPJean-Pierre Delahaye, CERN (EU dep. dir.)Gerald Dugan, Cornell University (Americas dir.)Atsushi Enomoto, KEKBrian Foster, Oxford University (EU dir.)Warren Funk, JLABJie Gao, IHEPTerry Garvey, LAL-IN2P3Hitoshi Hayano, KEKTom Himel, SLACBob Kephart, FermilabEun San Kim, Pohang Acc LabHyoung Suk Kim, Kyungpook Nat’l UnivShane Koscielniak, TRIUMFVic Kuchler, FermilabLutz Lilje, DESY

Tom Markiewicz, SLACDavid Miller, Univ College of LondonShekhar Mishra, FermilabYouhei Morita, KEKOlivier Napoly, CEA-SaclayHasan Padamsee, Cornell UniversityCarlo Pagani, DESYNan Phinney, SLACDieter Proch, DESYPantaleo Raimondi, INFNTor Raubenheimer, SLACFrancois Richard, LAL-IN2P3Perrine Royole-Degieux, GDE/LALKenji Saito, KEKDaniel Schulte, CERNTetsuo Shidara, KEKSasha Skrinsky, Budker InstituteFumihiko Takasaki, KEK (Asia dir.)Laurent Jean Tavian, CERNNobu Toge, KEKNick Walker, DESY (EU dep. dir.)Andy Wolski, LBLHitoshi Yamamoto, Tohoku UnivKaoru Yokoya, KEK

49 members

ILC-GDE

The GDE Plan and Schedule 2005 2006 2007 2008 2009 2010

Global Design Effort Project

Baseline configuration

Reference Design

ILC R&D Program

Technical Design

Expressions of interest to Host; Site Selection;

International Mgmt

LHCPhysics


ILC-GDE

main linacbunchcompressor

dampingring

source

pre-accelerator

collimation

final focus

IP

extraction& dump

KeV

few GeV

few GeVfew GeV

250-500 GeV

Starting Point for the GDE

Superconducting RF Main Linac


ILC-GDEThe International Technical Recommendation Panel (ITRP)

• 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 recommendation of the ITRP was unanimously endorsed by ICFA on August 20, 2004.


ILC-GDE

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


ILC-GDEAccelerator 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.


ILC-GDE

Affordability challenges

cf31%

structures18%rf

12%

systems_eng8%

installation&test7%

magnets6%

vacuum4%

controls4%

cryo4%

operations4%

instrumentation2%

Civil

SCRF Linac


ILC-GDE

• 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)

GDE – Elements of the Near Term Plan


ILC-GDE

Towards a final Baseline Configuration

August September October November December

2005we are here

Summarize Snowmass results all documented ‘recommendations’ publicly

available on www (request community feedback)

review by BCD EC

BCD EC publishes‘strawman’ BCD

public review

Frascati GDE meeting

BCD Executive Committee (EC):BarishDugan, Foster, Takasaki (regional directors)Raubenheimer, Yokoya, Walker (gang of three)


ILC-GDE

First ILC workshop at KEK

Nov 13-15, 2004


ILC-GDE

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

Goals


ILC-GDE

The Hard Questions


ILC-GDE

The Hard Questions

Many questions are interrelated


ILC-GDE

The Hard Questions

Critical choices: luminosity parameters & gradient


ILC-GDE

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


ILC-GDE

The Luminosity Plane 2×1034 cm-2s-1

nom low N lrg Y low P High L

N 1010 2 1 2 2 2

nb 2820 5640 2820 1330 2820

x,y m, nm 9.6, 40 10,30 12,80 10,35 10,30

x,y cm, mm 2, 0.4 1.2, 0.2 1, 0.4 1, 0.2 1, 0.2

x,y nm 543, 5.7 495, 3.5 495, 8 452, 3.8 452, 3.5

Dy 18.5 10 28.6 27 22

BS % 2.2 1.8 2.4 5.7 7

z m 300 150 500 200 150

Pbeam MW 11 11 11 5.3 11

=5.6×1034


ILC-GDE

Main Linac Accelerating Gradient

• Baseline recommendation for cavity is standard TESLA 9-cell

• Alternatives (energy upgrade): – Low-loss,

– Re-entrant

– superstructure


ILC-GDE

Gradient-baseline recommendation

Cavity type

Qualifiedgradient

Operational gradient

Length* energy

MV/m MV/m Km GeV

initial TESLA 35 31.5 10.6 250

upgrade LL 40 36.0 +9.3 500

* assuming 75% fill factor

Total length of one 500 GeV linac 20km


ILC-GDEHow do Costs Scale with Gradient?

Relative

Co

st

Gradient MV/m

2

0

$ lincryo

a Gb

G Q≈ +

35 MV/m is close to optimum

30 MV/m would give safety margin

C. Adolphsen (SLAC)


ILC-GDER&D for baseline

gradient

Results from KEK-DESY collaboration

must reduce spread (need more statistics)

single-cell measurements (in nine-cell cavities)


ILC-GDE

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/mJLab: 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

R&D for upgrade gradient


ILC-GDE

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.

ILC-GDE The ILC Global Design Effort Gerry Dugan ILC/GDE and Cornell University SLUO Annual Meeting...

Documents

Transcript of ILC-GDE The ILC Global Design Effort Gerry Dugan ILC/GDE and Cornell University SLUO Annual Meeting...