Industry and the ILC B Barish 16-Aug-05. 12-May-05ILC Consultations - Washington DC2 Why e + e - Collisions? elementary particles well-defined –energy,

Industry and the ILC

B Barish16-Aug-05

12-May-05 ILC Consultations - Washington DC 2

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


The Energy Frontier


GLC GLC/NLC Concept

• The main linacs operate at an unloaded gradient of 65 MV/m, beam-loaded to 50 MV/m.

• The rf systems for 500 GeV c.m. consist of 4064 75 MW Periodic Permanent Magnet (PPM) klystrons arranged in groups of 8, followed by 2032 SLED-II rf pulse compression systems


TESLA Concept

• The main linacs based on 1.3 GHz superconducting technology operating at 2 K.

• The cryoplant, is of a size comparable to that of the LHC, consisting of seven subsystems strung along the machines every 5 km.


Which Technology to Chose?

– 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.


Evaluate a Criteria Matrix

• A panel (ITRP) 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


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 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.)

Schedule

2005 2006 2007 2008 2009 2010

Global Design Effort Project

Baseline configuration

Reference Design

ILC R&D Program

Technical Design

Bids to Host; Site Selection;

International Mgmt

LHCPhysics


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


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


Cost Breakdown by Subsystem

cf31%

structures18%rf

12%

systems_eng8%

installation&test7%

magnets6%

vacuum4%

controls4%

cryo4%

operations4%

instrumentation2%

Civil

SCRF Linac


TESLA Cavity

9-cell 1.3GHz Niobium Cavity

Reference design: has not been modified in 10 years

~1m


What Gradient to Choose?


Gradient

Results from KEK-DESY collaboration

must reduce spread (need more statistics)

single

-cell

measu

rem

ents

(in

nin

e-c

ell

cavit

ies)


(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

Electro-polishing


How Costs Scale with Gradient?

Relative

Co

st

Gradient MV/m

2

0

$ lincryo

a Gb

G Q

35MV/m is close to optimum

Japanese are still pushing for 40-45MV/m

30 MV/m would give safety margin

C. Adolphsen (SLAC)


Evolve the Cavities Minor 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


New Cavity Design

More radical concepts potentially offer greater benefits.

But require time and major new infrastructure to develop.

28 cell Super-structure

Re-entrant

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

(Cornell)


How and when to involve industry

• Large Scale Project Characterization– Large Project Management– Precision Engineering– International Coordination

• Industrialization– Civil Construction & Infrastructure– Cryogenics– Superconducting RF structures, couplers, etc– Electronics and Control Systems– Large Scale Computing

Documents

Industry and the ILC B Barish 16-Aug-05. 12-May-05ILC Consultations - Washington DC2 Why e + e - Collisions? elementary particles well-defined –energy,