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News from the ILC. Barry Barish Users’ Meeting Fermilab 9-June-05. Why e + e - Collisions?. elementary particles well-defined energy, angular momentum uses full COM energy produces particles democratically can mostly fully reconstruct events. A Rich History as a Powerful Probe.

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News from the ilc

News from the ILC

Barry Barish

Users’ Meeting

Fermilab

9-June-05


Why e e collisions
Why e+e- Collisions?

  • elementary particles

  • well-defined

    • energy,

    • angular momentum

  • uses full COM energy

  • produces particles democratically

  • can mostly fully reconstruct events

Fermiab Users' Meeting - Barish


A Rich History as a Powerful Probe

Fermiab Users' Meeting - Barish


The Energy Frontier

Fermiab Users' Meeting - Barish


Why a tev scale
Why a TeV Scale?

  • Two parallel developments over the past few years (the science)

    • The precision information e+e- and n data at present energies have pointed to a low mass Higgs; Understanding electroweak symmetry breaking, whether supersymmetry or an alternative, will require precision measurements.

    • There are strong arguments for needing both pp and e+e- collisions to fully exploit the exciting science expected in the 1 TeV energy scale.

Fermiab Users' Meeting - Barish


Why a tev scale e e accelerator
Why a TeV Scale e+e- Accelerator?

  • Two parallel developments over the past few years (the technology)

    • Designs and technology demonstrations have matured on two technical approaches for an e+e- collider that are well matched to our present understanding of the physics.

Fermiab Users' Meeting - Barish


Which technology to choose
Which Technology to Choose?

  • Two alternate designs -- “warm” and “cold” had come to the stage where the show stoppers had been eliminated and the concepts were well understood.

  • A major step toward a new international machine required uniting behind one technology, and then working toward a unified global design based on the recommended technology.

Fermiab Users' Meeting - Barish


International Technology Review Panel

Fermiab Users' Meeting - Barish


Evaluate a criteria matrix
Evaluate a Criteria Matrix

  • The panel analyzed the technology choice through studying a matrix having six general categories with specific items under each:

    • the scope and parameters specified by the ILCSC;

    • technical issues;

    • cost issues;

    • schedule issues;

    • physics operation issues;

    • and more general considerations that reflect the impact of the LC on science, technology and society

Fermiab Users' Meeting - Barish


The recommendation
The 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).

    • The superconducting technology has several very nice features for application to a linear collider. They follow in part from the low rf frequency.

Fermiab Users' Meeting - Barish


The Community then Self-Organized

Nov 13-15, 2004

Fermiab Users' Meeting - Barish


The First ILC Meeting at KEK

Fermiab Users' Meeting - Barish


The global design effort

Formal organization begun at LCWS 05 at Stanford

in March 2005 when I became director of the GDE

The Global Design Effort

Technically Driven Schedule


Gde near term plan
GDE – Near Term Plan

  • Staff the GDE

    • Administrative, Communications, Web staff

    • Regional Directors (each region)

    • Engineering/Costing Engineer (each region)

    • Civil Engineer (each region)

    • Key Experts for the GDE design staff from the world community (please give input)

    • Fill in missing skills (later)

      Total staff size about 20 FTE (2005-2006)

Fermiab Users' Meeting - Barish


Gde near term plan1
GDE – Near Term Plan

  • Schedule

    • Begin to define Configuration (Aug 05)

    • Baseline Configuration Document by end of 2005

      -----------------------------------------------------------------------

    • Put Baseline under Configuration Control (Jan 06)

    • Develop Reference Design Report by end of 2006

  • Three volumes -- 1) Reference Design Report; 2) Shorter glossy version for non-experts and policy makers ; 3) Detector Concept Report

  • Fermiab Users' Meeting - Barish


    Gde near term plan2
    GDE – Near Term Plan

    • Organize the ILC effort globally

      • First Step --- Appoint Regional Directors within the GDE who will serve as single points of contact for each region to coordinate the program in that region. (Gerry Dugan (North America), Fumihiko Takasaki (Asia), offered to Brian Foster (Europe))

      • Make Website, coordinate meetings, coordinate R&D programs, etc

    • 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)

    Fermiab Users' Meeting - Barish


    Starting Point for the GDE

    Superconducting RF Main Linac

    Fermiab Users' Meeting - Barish


    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

    Fermiab Users' Meeting - Barish


    Towards the ilc baseline design
    Towards the ILC Baseline Design

    Fermiab Users' Meeting - Barish


    Specific Machine Realizations

    • rf bands:

    • L-band (TESLA) 1.3 GHz l = 3.7 cm

    • S-band (SLAC linac) 2.856 GHz 1.7 cm

    • C-band (JLC-C) 5.7 GHz 0.95 cm

    • X-band (NLC/GLC) 11.4 GHz 0.42 cm

    • (CLIC) 25-30 GHz 0.2 cm

    • Accelerating structure size is dictated by wavelength of the rf accelerating wave. Wakefields related to structure size; thus so is the difficulty in controlling emittance growth and final luminosity.

    • Bunch spacing, train length related to rf frequency

    • Damping ring design depends on bunch length, hence frequency

    Frequency dictates many of the design issues for LC

    Fermiab Users' Meeting - Barish


    Cost breakdown by subsystem
    Cost Breakdown by Subsystem

    Civil

    SCRF Linac

    Fermiab Users' Meeting - Barish


    Tesla cavity
    TESLA Cavity

    ~1m

    9-cell 1.3GHz Niobium Cavity

    Reference design: has not been modified in 10 years

    Fermiab Users' Meeting - Barish


    What gradient to choose
    What Gradient to Choose?

    Fermiab Users' Meeting - Barish


    Gradient
    Gradient

    Results from KEK-DESY collaboration

    must reduce spread (need more statistics)

    single-cell measurements (in nine-cell cavities)

    Fermiab Users' Meeting - Barish


    Electro-polishing

    (Improve surface quality -- pioneering work done at KEK)

    BCP

    EP

    • Several single cell cavities at g > 40 MV/m

    • 4 nine-cell cavities at ~35 MV/m, one at 40 MV/m

    • Theoretical Limit 50 MV/m

    Fermiab Users' Meeting - Barish


    How costs scale with gradient
    How Costs Scale with Gradient?

    35MV/m is close to optimum

    Japanese are still pushing for 40-45MV/m

    30 MV/m would give safety margin

    Relative Cost

    Gradient MV/m

    C. Adolphsen (SLAC)

    Fermiab Users' Meeting - Barish


    Fermilab emerging ilc scrf program
    Fermilab - Emerging ILC SCRF Program

    H Carter

    Fermiab Users' Meeting - Barish


    Fermilab ilc scrf program
    Fermilab ILC SCRF Program

    Fermiab Users' Meeting - Barish


    Fermilab ilc scrf program1
    Fermilab ILC SCRF Program

    Fermiab Users' Meeting - Barish


    Fermilab ilc scrf program2
    Fermilab ILC SCRF Program

    Fermiab Users' Meeting - Barish


    Fermilab ilc scrf program3
    Fermilab ILC SCRF Program

    Fermiab Users' Meeting - Barish


    Fermilab ilc scrf program4
    Fermilab ILC SCRF Program

    Fermiab Users' Meeting - Barish


    Tesla cavity1
    TESLA Cavity

    ~1m

    9-cell 1.3GHz Niobium Cavity

    Reference design: has not been modified in 10 years

    Fermiab Users' Meeting - Barish


    Evolve the cavities minor enhancement
    Evolve the CavitiesMinor Enhancement

    Low Loss Design

    Modification to cavity shape reduces peak B field. (A small Hp/Eacc ratio around 35Oe/(MV/m) must be designed).

    This generally means a smaller bore radius

    Trade-offs (Electropolishing, weak cell-to-cell coupling, etc)

    KEK currently producing prototypes

    Fermiab Users' Meeting - Barish


    New cavity design
    New Cavity Design

    Re-entrant

    28 cell Super-structure

    More radical concepts potentially offer greater benefits.

    But require time and major new infrastructure to develop.

    single-cell achieved45.7 MV/m Q0 ~1010

    (Cornell)

    Fermiab Users' Meeting - Barish


    Ilc siting and civil construction
    ILC Siting and Civil Construction

    • 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

      • North American sample site will be near Fermilab

    Fermiab Users' Meeting - Barish


    Fermilab ilc civil program
    Fermilab ILC Civil Program

    A Fermilab Civil Group is collaborating with SLAC Engineers and soon with Japanese and European engineers to develop methods of analyzing the siting issues and comparing sites.

    The current effort is not intended to select a potential site, but rather to understand from the beginning how the features of sites will effect the design, performance and cost

    Fermiab Users' Meeting - Barish



    Strawman final focus
    Strawman Final Focus

    Fermiab Users' Meeting - Barish


    Fermilab and the ilc
    Fermilab and the ILC

    • Fermilab is rapidly developing a superconducting RF capability for the main linac design and development for the ILC.

    • The Civil group at Fermilab is playing a central role in developing methods for understanding the siting and the interplay with the design.

    • Plans are being developed to build a strong accelerator physics group at Fermilab for the ILC.

    • There are many opportunities for involvement by the experimental community in the accelerator, the machine detector interfaces and the detector designs.

      --------------------------------------------------------------------------------------

    • Fermilab can position itself very well to be able to succesfully bid to host the ILC, without mortgaging the rest of the program

    Fermiab Users' Meeting - Barish


    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, detailed design, …), but there is increasing momentum toward the ultimate goal --- An International Linear Collider.

    Fermiab Users' Meeting - Barish


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