overview
DESCRIPTION
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. Why a linear collider ?. the accelerating cavities. N. N. S. S. - PowerPoint PPT PresentationTRANSCRIPT
H.Schmickler 1
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
H.Schmickler 2
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
H.Schmickler 3
•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!
H.Schmickler 4
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
H.Schmickler 6
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
H.Schmickler 7
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