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Towards an Towards an International Linear ColliderInternational Linear Collider
Barry BarishCaltech / GDE
25-July-07
25-July-07 Caltech DoE Review Global Design Effort 2
ILC -- Caltech
25-July-07 Caltech DoE Review Global Design Effort 3
Exploring the Terascalethe tools
• The LHC– It will lead the way and has large reach– Quark-quark, quark-gluon and gluon-gluon
collisions at 0.5 - 5 TeV– Broadband initial state
• The ILC– A second view with high precision– Electron-positron collisions with fixed
energies, adjustable between 0.1 and 1.0 TeV– Well defined initial state
• Together, these are our tools for the terascale
25-July-07 Caltech DoE Review Global Design Effort 4
LHC: Low mass Higgs: H MH < 150 GeV/c2
Rare decay channel: BR~10-3
Requires excellent electromagnetic calorimeter performance
acceptance, energy and angle resolution,
g/jet and g/p0 separation Motivation for LAr/PbWO4
calorimeters for CMS
Resolution at 100 GeV: 1 GeV
Background large: S/B 1:20, but can estimate from non signal areas
CMS
25-July-07 Caltech DoE Review Global Design Effort 5
ILC: Precision Higgs physics
Model-independent Studies
• mass
• absolute branching ratios
• total width
• spin
• top Yukawa coupling
• self coupling
Precision MeasurementsGarcia-Abia et al
25-July-07 Caltech DoE Review Global Design Effort 6
The linear collider will measure the spin of any Higgs it can produce by measuring the energy dependence from threshold
Is it really the Higgs ?
Measure the quantum numbers. The Higgs must have spin zero !
25-July-07 Caltech DoE Review Global Design Effort 7
Higgs Couplings at the ILC
Mass (GeV)
Higgs Coupling strength is proportional to Mass
25-July-07 Caltech DoE Review Global Design Effort 8
e+e- : Studying the Higgsdetermine the underlying model
SM 2HDM/MSSM
Yamashita et al Zivkovic et al
25-July-07 Caltech DoE Review Global Design Effort 9
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
25-July-07 Caltech DoE Review Global Design Effort 10
main linacbunchcompressor
dampingring
source
pre-accelerator
collimation
final focus
IP
extraction& dump
KeV
few GeV
few GeVfew GeV
250-500 GeV
Designing a Linear Collider
Superconducting RF Main Linac
The GDE Plan and Schedule
2005 2006 2007 2008 2009 2010
Global Design Effort Project
Baseline configuration
Reference Design
ILC R&D Program
Engineering Design
Expression of Interest to Host
International Mgmt
LHCPhysics
25-July-07 Caltech DoE Review Global Design Effort 12
RDR Design Parameters
Max. Center-of-mass energy 500 GeV
Peak Luminosity ~2x1034 1/cm2s
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
25-July-07 Caltech DoE Review Global Design Effort 13
– 11km SC linacs operating at 31.5 MV/m for 500 GeV– Centralized injector
• Circular damping rings for electrons and positrons• Undulator-based positron source
– Single IR with 14 mrad crossing angle– Dual tunnel configuration for safety and availability
RDR ILC Schematic
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RDR Design & “Value” Costs
SummaryRDR “Value” Costs
Total Value Cost (FY07)4.80 B ILC Units Shared
+1.82 B Units Site Specific
+14.1 K person-years
(“explicit” labor = 24.0 M person-hrs @ 1,700 hrs/yr)
1 ILC Unit = $ 1 (2007)
The reference design was “frozen” as of 1-Dec-06 for the purpose of producing the RDR, including costs.
It is important to recognize this is a snapshot and the design will continue to evolve, due to results of the R&D, accelerator studies and value engineering The value costs have already been reviewed twice
• 3 day “internal review” in Dec• ILCSC MAC review in Jan
Σ Value = 6.62 B ILC Units
25-July-07 Caltech DoE Review Global Design Effort 15
Reference Design and Plan
Producing Cavities
Cavity Shape
Obtaining Gradientsingle cells
25-July-07 Caltech DoE Review Global Design Effort 16
4th generation prototype ILC cryomodule
Cryomodules
TESLA cryomodule
25-July-07 Caltech DoE Review Global Design Effort 17
The Main Linac
• Costs have been estimated regionally and can be compared. – Understanding differences require detail comparisons –
industrial experience, differences in design or technical specifications, labor rates, assumptions regarding
quantity discounts, etc.
25-July-07 Caltech DoE Review Global Design Effort 18
– Three RF/cable penetrations every rf unit– Safety crossovers every 500 m– 34 kV power distribution
Main Linac Double Tunnel
25-July-07 Caltech DoE Review Global Design Effort 19
Conventional Facilities
72.5 km tunnels ~ 100-150 meters underground
13 major shafts > 9 meter diameter
443 K cu. m. underground excavation: caverns, alcoves, halls
92 surface “buildings”, 52.7 K sq. meters = 567 K sq-ft total
25-July-07 Caltech DoE Review Global Design Effort 20
Reference Design and Plan
Making Positrons
6km Damping Ring
10MW Klystrons
Beam Delivery and Interaction Point
25-July-07 Caltech DoE Review Global Design Effort 21
Assessing the RDR
• Reviews (5 major international reviews + regional)– The Design: “The MAC applauds that considerable evolution
of the design was achieved … the performance driven baseline configuration was successfully converted into a cost conscious design.”
– The R&D Plan: “The committee endorses the approach of collecting R&D items as proposed by the collaborators, categorizing them, prioritizing them, and seeking contact with funding agencies to provide guidelines for funding.
– International Cost Review (Orsay): Supported the costing methodology; considered the costing conservative in that they identify opportunities for cost savings; etc.
• Final Steps– The final versions of Executive Summary, Reference Design
Report and Companion Document were submitted to FALC (July), and finally will be given to ILCSC and ICFA (August).
25-July-07 Caltech DoE Review Global Design Effort 22
Schedule for the ILC?
• Our technically driven timeline is – Construction proposal in 2010 – Construction start in 2012– Construction complete in 2019
“Completing the R&D and engineering design, negotiating an internationalstructure, selecting a site, obtainingfirm financial commitments, and building a machine could take us well into the mid-2020s, if not later,”
25-July-07 Caltech DoE Review Global Design Effort 23
Technically Driven Timeline
August
BCD Construction Startup
2006 2010 2014 2018
RDR EDRBeginConst
EndConst
EngineerDesign
25-July-07 Caltech DoE Review Global Design Effort 24
Civil Construction Timeline
25-July-07 Caltech DoE Review Global Design Effort 25
CMS assembly approach:• Assembled on the surface in parallel with underground work• Allows pre-commissioning before lowering• Lowering using dedicated heavy lifting equipment• Potential for big time saving• Reduces size of required underground hall
On-surface Detector Assembly CMS approach
25-July-07 Caltech DoE Review Global Design Effort 26
Technically Driven Timeline
August
BCD
All regions require ~ 5 yrs
Construction Startup
Siting Plan being Developed
2006 2010 2014 2018
RDR EDRBeginConst
EndConst
EngineerDesign
Site Prep
Site Select
25-July-07 Caltech DoE Review Global Design Effort 27
Situation : in solid rock, close to existing institute, close to the city
of Chicago and international airport, close to railway and
highway networks.
Geology : Glacially derived deposits overlaying Bedrock. The
concerned rock layers are from top to bottom the Silurian
dolomite, Maquoketa dolomitic shale, and the Galena-
Platteville dolomites.
Depth of main tunnels : Average ~ 135 m
Americas Fermilab Sample Site
25-July-07 Caltech DoE Review Global Design Effort 28
~ 5.5 km
~ 5.5 km
Central Area fits inside the Fermilab boundary
Site Characterization of the Central Area can be done
~ Boundary of Fermilab
Preconstruction Plan: Fermilab
25-July-07 Caltech DoE Review Global Design Effort 29
Technically Driven Timeline
August
BCD
All regions ~ 5 yrs
Construction Startup
Siting Plan being Developed
2006 2010 2014 2018
RDR EDRBeginConst
EndConst
EngineerDesign
Site Prep
Site Select
R & D -- Industrialization
25-July-07 Caltech DoE Review Global Design Effort 30
The Task Forces
• The Task Forces were put together successively over a period of five months:
S0/S1-Cavities, Cryomodule
S2 -Cryomodule String Tests S3 -Damping Rings S4 -Beam Delivery System S5-Positron Source
S6-Controls, not yet activeS7-RF
• Working in close collaboration with the Engineering and Risk Assessment team.
25-July-07 Caltech DoE Review Global Design Effort 31
Module Test – Results
DESY
25-July-07 Caltech DoE Review Global Design Effort 32
E Cloud – Results
SLAC
25-July-07 Caltech DoE Review Global Design Effort 33
Schedule in Graphical Form2009 2012 2015 2018
ConstructionSchedule
CryomoduleProduction
RF System Tests
25-July-07 Caltech DoE Review Global Design Effort 34
Technically Driven Timeline
August
BCD
All regions ~ 5 yrs
Construction Startup
Siting Plan being Developed
2006 2010 2014 2018
RDR EDRBeginConst
EndConst
EngineerDesign
Site Prep
Site Select
R & D -- Industrialization
Gradient
e-CloudCryomoduleFull Production
System Tests
& XFEL
Detector Install
Detector Construct
25-July-07 Caltech DoE Review Global Design Effort 35
Detector Concepts
25-July-07 Caltech DoE Review Global Design Effort 36
Detector Performance Goals
25-July-07 Caltech DoE Review Global Design Effort 37
Detector Performance Goals
25-July-07 Caltech DoE Review Global Design Effort 38
Detector Performance Goals
• ILC detector performance requirements and comparison to the LHC detectors:○ Inner vertex layer ~ 3-6 times closer to IP
○ Vertex pixel size ~ 30 times smaller
○ Vertex detector layer ~ 30 times thinner
Impact param resolution Δd = 5 [μm] + 10 [μm] / (p[GeV] sin 3/2θ)
○ Material in the tracker ~ 30 times less
○ Track momentum resolution ~ 10 times better
Momentum resolution Δp / p2 = 5 x 10-5 [GeV-1] central region
Δp / p2 = 3 x 10-5 [GeV-1] forward region
○ Granularity of EM calorimeter ~ 200 times better
Jet energy resolution ΔEjet / Ejet = 0.3 /√Ejet
Forward Hermeticity down to θ = 5-10 [mrad]
25-July-07 Caltech DoE Review Global Design Effort 39
detectorB
may be accessible during run
accessible during run Platform for electronic and
services (~10*8*8m). Shielded (~0.5m of concrete) from five sides. Moves with detector. Also provide vibration isolation.
Concept of IR hall with two detectors
The concept is evolving and details being worked out
detectorA
25-July-07 Caltech DoE Review Global Design Effort 40
Technically Driven Timeline
August
BCD
All regions ~ 5 yrs
Construction Startup
Siting Plan being Developed
2006 2010 2014 2018
RDR EDRBeginConst
EndConst
EngineerDesign
Site Prep
Site Select
R & D -- Industrialization
Gradient
e-CloudCryomoduleFull Production
System Tests
& XFEL
Detector Install
Detector Construct
Pre-Operations
25-July-07 Caltech DoE Review Global Design Effort 41
Conclusions
• The ILC design is proceeding toward an engineering design by 2010. (Goal: Ready to propose construction when LHC results justify).
• R&D program is being globally coordinated to determine gradient, electron cloud, industrialization, mass production. (Resources are regional, by country and laboratory).
• Detector R&D also very important to be able to fully exploit the ILC (e.g. spatial & energy resolution) (Needs improved coordination, better regional balance).
• Caltech effort is myself + some student projects. But, we are in excellent position to ramp up as desired and the when time is right.