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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

slide3

A Rich History as a Powerful Probe

Fermiab Users' Meeting - Barish

slide4

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

slide8

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

slide11

The Community then Self-Organized

Nov 13-15, 2004

Fermiab Users' Meeting - Barish

slide12

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

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      • 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

slide17

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

slide20

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

slide25

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

slide41

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