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Overview

• Why a linear e+e- collider?• What is special about CLIC?• Technological challenges• Project implementation on CERN site• Project time scale• Outlook to Technical design phase

2011-2016

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Why a linear collider ?

Circular colliders use magnets to bend particle trajectoriesTheir advantage is that they re-use many times

N

S

N

S

However, charged particles emit synchrotron radiation in a magnetic field

the accelerating cavities

e+ e-

the same beams for collision

Much less important for heavy particles, like protons

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•Hadron Colliders at the energy frontier as discovery facilities

•Lepton Colliders for precision physics

•LHC coming online from 2009

•Consensus for a future lepton linear collider to complement LHC physics

Particle accelerators with colliding beams a long standing success story in particles discoveries and precision measurements

Lepton and Hadron facilities complementary for discovery and physics of new particles

Energy (exponentially !) increasing

with time: a factor 10 every 8 years!

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LEP (27 km, 200 GeV e+ e-) @ CERN will probably remain the largest circular lepton collider ever built

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• Lots of them !

• Need a high accelerating gradient to reach the wanted energy in a “reasonable” length (total cost, cultural limit)

20 – 40 kmRF in RF out

E

e+ e-

source

damping ring

main linac

beam delivery

particles “surf” the electromagnetic wave

A linear collider uses the accelerating cavities only once

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Linear Collider challenges

Luminosity

High gradient

•Beam acceleration: MWatts of beam power with high gradient and high efficiency

•Generation of small emittance: Damping rings

•Conservation of small emittance: Wake-fields, few microns alignment, nm beam stability

•Extremely small beam sizes at Interaction Point: Focusing to nm beam sized in Beam delivery system, sub-nm beam stability

Energy reach

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The Linear Collider’s father: SLC @ SLAC

SLD luminosity(1992-1998)

1 Z/h 91027cm 2s1

20000 Z/week 1030cm 2s1

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World consensus about a Linear Collider as the next HEP facility after LHC

• 2001: ICFA recommendation of a world-wide collaboration to construct a high luminosity e+/e- Linear Collider with an energy range up to at least 400 GeV/c

• 2003: ILC-Technical Review Committee to assess the technical status of the 15 years R&D on various technologies and designs of Linear Colliders

• 2004: International Technology Recommendation Panel selected the Super-Conducting RF technology developed by the TESLA Collaboration for an International Linear Collider (ILC) in the TeV energy range

• 2004: CERN council support for R&D addressing the feasibility of the CLIC technology to possibly extend Linear Colliders into the Multi-TeV energy range.

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ILC @ 500 GeVILC web site: http://www.linearcollider.org/cms/

Max. Center-of-mass energy 500 GeV

Peak Luminosity ~2x1034 cm-2s-1

Beam Current 9.0 mA

Repetition rate 5 Hz

Average accelerating gradient 31.5 MV/m

Beam pulse length 0.95 ms

Total Site Length 31 km

Total AC Power Consumption

~230 MW

31 km

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Aim: develop technology to extend e-/e+ linear colliders into the Multi-TeV energy range: http://clic-study.web.cern.ch/CLIC-Study/

ECM energy range from ILC to LHC maximum reach and beyond =>ECM = 0.5- 3 TeV

L > few 1034 cm-2 with acceptable background and energy spread

ECM and L to be reviewed when LHC physics results avail.

Affordable cost and power consumption

Physics motivation: http://clicphysics.web.cern.ch/CLICphysics/"Physics at the CLIC Multi-TeV Linear Collider: by the CLIC Physics Working Group:CERN 2004-5

Present goal:Demonstrate all key feasibility issues and document in a ConceptualDesign Report by 2010 and possibly Technical Design Report by 2016

THE COMPACT LINEAR COLLIDER (CLIC) STUDY

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CLIC – basic features

– “Compact” collider – total length < 50 km at 3 TeV

– Normal conducting acceleration structures at high frequency

• Novel Two-Beam Acceleration Scheme– Cost effective, reliable, efficient– Simple tunnel, no active elements– Modular, easy energy upgrade in

stages

CLIC TUNNEL CROSS-SECTION

4.5 m diameter

QUAD

QUAD

POWER EXTRACTIONSTRUCTURE

BPM

ACCELERATINGSTRUCTURES

Drive beam - 95 A, 300 nsfrom 2.4 GeV to 240 MeV

Main beam – 1 A, 200 ns from 9 GeV to 1.5 TeV

12 GHz – 140 MW

• High acceleration gradient: > 100 MV/m

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e+ injector, 2.4 GeV

e- injector2.4 GeV

CLIC overall layout3 TeV

e+ main linace- main linac , 12 GHz, 100 MV/m, 21.04 km

BC2BC2

BC1

e+ DR365m

e- DR365m

booster linac, 9 GeV, 2 GHz

decelerator, 24 sectors of 868 m

IP1

BDS2.75 km

BDS2.75 km

48.3 km

drive beam accelerator2.37 GeV, 1.0 GHz

combiner rings Circumferences delay loop 80.3 m

CR1 160.6 mCR2 481.8 m

CR1CR2

delayloop

326 klystrons33 MW, 139 s

1 km

CR2delayloop

drive beam accelerator2.37 GeV, 1.0 GHz

326 klystrons33 MW, 139 s

1 km

CR1

TAR=120m

TAR=120m

245m 245m

Drive Beam Generation Complex

Main Beam Generation Complex

Main & Drive Beam generation complexes not to scale

CERN Geology - CLIC Long Profile for CDR

(Laser Straight)

CERN Prevessin Site

‘Metro standard’ 5.6m tunnel :

Proposed at CTC May 2009

Water cooling via 7km Lake transfer tunnel

H.Schmickler 1616EPAC 2008 CLIC / CTF3 G.Geschonke, CERN

CLIC Two Beam Module

Drive Beam

Main Beam

Transfer lines

Main Beam

Drive Beam

20760 modules (2 meters long)

71460 power production structures PETS (drive beam)

143010 accelerating structures

(main beam)

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Tunnel integration

Standard tunnel with modulesStandard tunnel with modules

DB dump

DB turn-around

UTRA cavern

1704.12.2008

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TDR major activities2010 2011 2012 2013 2014 2015 2016

1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

CTF3 TBTS operation

inst.

1-2 structures, beam loading, breakdown kick

CTF3 TBL operation inst.

Deceleration 8

PETS

final decelerator test (16 PETS,

50%)

Modules lab

initial tests, installation 2

modules

further tests, installation 4

modules testing pre-series production, industrialization

Modules CTF3

1 module

inst.

testing 1

module

3 modules inst. testing 3 modules > upgrades?

CTF3 phase feedback design, hardware tests

installation testing

CTF3 TBL+ installat

ioncommissio-ning RF testing, potential upgrades

CLIC DB injector & linac design & hardware construction installation commissioning staged upgrade & testing

RF structures construction

precision metrology, fabr.

procedures

up to 40 structures built, establish precision machining at CERN or elsewhere, 5 m tolerances

achievedmore than 200 structures built, final cost

optimization, pre-series with industry

RF test infrastructure

CERN test

stand inst.

CERN test stand testing and upgrades (at least

two slots)

continue testing with increased capabilities, CERN or elsewhere,

up to 10 slotstesting, up to 200 accelerating structures plus

PETS and RF componentsPrototypes of critical components

technical choices, design construction, hardware tests

finalization, performance & cost optimization, industrialization for large scale components