ilc global design effortbcbact/talks06/lcws india talk 03-0… · barish - snowmass plenary talk....

ILC Global Design Effort

Barry BarishGDE

9-March-06

9-March-06 LCWS06 Bangalore 2

Global Design Effort (GDE)• On March 18, 2005, during the opening of LCWS05

workshop at Stanford University, I officially accepted the position of Director of the (yet to be formed) GDE


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.)


GDE Begins at Snowmass

GDE MembersAmericas 22 Europe 24 Asia 16


Barish - Snowmass Plenary Talk


main linacbunchcompressor

dampingring

source

pre-accelerator

collimation

final focus

IP

extraction& dump

KeV

few GeV

few GeVfew GeV

250-500 GeV

Designing a Linear Collider

Superconducting RF Main Linac


Baseline Configuration Document

• Our ‘Deliverable’ by the end of 2005

• A structured electronic document– Documentation (reports, drawings etc)– Technical specs.– Parameter tables


Structure of the BCD

Summary-like overview for those who want to understand the choice and the why

Technical documentationof the baseline, for engineers and acc. phys. making studies towards RDR


Alternatives Section(s)

Note ACD is part of the BCD


The Key Decisions

Critical choices: luminosity parameters & gradient


Making Choices – The Tradeoffs

Many decisions are interrelated and require input from several WG/GG groups


Parametric Approach

• A working space - optimize machine for cost/performance


From Snowmass to a Baseline

August September October November December

2005Snowmass

WW/GG summaries

Response to list of 40+ decisions

All documented ‘recommendations available on ILC Website (request community feedback)

Review by BCD EC BCD EC publishes‘strawman’ BCD

PublicReview Frascati

GDE meeting

BCD Executive Committee:BarishDugan, Foster, Takasaki Raubenheimer, Yokoya, Walker


The Baseline Machine (500GeV)

not to scale

~30 km

e+ undulator @ 150 GeV (~1.2km)x2R = 955m

E = 5 GeV

RTML ~1.6kmML ~10km (G = 31.5MV/m)20mr

2mr BDS 5km


Electron Source

Positron-style room-temperature

accelerating section

diagnostics section

standard ILC SCRF modules

sub-harmonic bunchers + solenoids

laser E=70-100 MeV

• DC Guns incorporating photocathode illuminated by a Ti: Sapphiredrive laser.

• Long electron microbunches (~2 ns) are bunched in a bunching section

• Accelerated in a room temperature linac to about 100 MeV and SRF linac to 5 GeV.

DC gun(s)


Positron Source

Primary e-

source

e-

DR

Target e-

Dump

Photon Beam Dump

e+

DR

Auxiliary e-

Source

Photon Collimators

Adiabatic Matching

Device

e+ pre-accelerator

~5GeV

150 GeV 100 GeVHelical

UndulatorIn By-Pass

Line

PhotonTarget

250 GeVPositron Linac

IP

Beam Delivery System

Keep Alive: This source would have all bunches filled to 10% of nominal intensity.

Helical Undulator Based Positron Source with Keep Alive System


ILC Small Damping Ring

Multi-Bunch Trains with inter-train gaps


ILC Damping Ring: Baseline Design

• Positrons:– Two rings of ~6 km circumference in

a single tunnel.

– Two rings are needed to reduce e-cloud effects unless significantprogress can be made withmitigation techniques.

– Preferred to 17 km dogbone due to:• Space-charge effects • Acceptance • Tunnel layout (commissioning time,stray fields)

• Electrons:– One 6 km ring.


Main Linac: SRF Cavity Gradient

Cavity type

Qualifiedgradient

Operational gradient

Length* energy

TESLA

LL

MV/m MV/m Km

initial 35 31.5 10.6 250

upgrade

GeV

40 36.0 +9.3 500

* assuming 75% fill factorTotal length of one 500 GeV linac ≈ 20km


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


Superconducting RF Cavities

High Gradient Accelerator35 MV/meter -- 40 km linear collider


Improved ProcessingElectropolishing

Chemical Polish

Electro Polish


RF Power: ModulatorBaseline

Alternate

The Bouncer Compensated Pulse Transformer Style Modulator

Operation: an array of capacitors is charged in parallel, discharged in series. (~2m)

Will test full prototype in 2006


RF Power: Baseline Klystrons

Thales CPI Toshiba

Specification:

10MW MBK

1.5ms pulse

65% efficiency


Increasediameter beyond X-FEL

Increasediameter beyond X-FEL

Review 2-phase pipe size and effect of slope

ILC Cryomodule


ILC Beam Delivery System

• Baseline – two BDSs, 20/2mrad, 2 detectors, 2 longitudinally separated IR

halls• Alternative 1

– two BDSs, 20/2mrad, 2 detectors in single IR hall @ Z=0• Alternative 2

– single IR/BDS, collider hall long enough for two push-pull detectors


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


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.


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.


ICFA FALC

FALC Resource Board

ILCSC

GDEDirectorate

GDEExecutive Committee

GlobalR&D Program

RDR Design Matrix

GDER & D Board

GDEChange Control Board

GDEDesign Cost Board

GDE RDR / R&D Organization


ICFA FALC

FALC Resource Board

ILCSC

GDEDirectorate


GlobalR&D Program

RDR Design Matrix

GDER & D Board




Reporting

resourcestechnical


ICFA FALC

FALC Resource Board

ILCSC

GDEDirectorate


GlobalR&D Program

RDR Design Matrix

GDER & D Board




GDE


ICFA FALC

FALC Resource Board

ILCSC

GDEDirectorate


GlobalR&D Program

RDR Design Matrix

GDER & D Board




ILCDesignEffort

ILCR&D

Program


Technical SystemsVacuum systemsMagnet systemsCryomoduleCavity PackageRF Power

InstrumentationDumps and CollimatorsAccelerator Physics

Global SystemsCommissioning, Operations & ReliabilityControl SystemCryogenicsCF&SInstallation

Area Systems e- e+ damping RTML main BDSsource source rings linac

Cost Roll-ups


From Baseline to a RDRJan July Dec

2006

Freeze ConfigurationOrganize for RDR

Bangalore

Review Design/Cost Methodology

Review InitialDesign / Cost Review Final

Design / CostRDR Document

Design and Costing PreliminaryRDR

Released

Frascati Vancouver Valencia

Internationl Linear Collider Timeline

2005 2006 2007 2008 2009 2010

Global Design Effort Project

Baseline configuration

Reference Design

ILC R&D Program

Technical Design

Expression of Interest to Host

International Mgmt


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!

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