The ILC Project - uni-heidelberg.de · The ILC Project Based on ILC Reference Design Report (RDR)...
Transcript of The ILC Project - uni-heidelberg.de · The ILC Project Based on ILC Reference Design Report (RDR)...
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
The ILC ProjectBased on ILC Reference Design Report (RDR) and Reports ofEuropean GDE Director (Brian Foster) to ECFA and EPS
Karlheinz Meier, U Heidelberg, JHWS 2007
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
History
Baseline Parameters of the ILC
Challenges
Worldwide Organisation
Selected ILC components presented here
Overall Layout
Cavities / Acceleration gradient
Positron Source
Beam Delivery / Experimental Areas
Cost
Next Steps
Outline
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
A Possible Apparatus for Electron-ClashingExperiments (*).
M. TignerLaboratory of Nuclear Studies. Cornell University - Ithaca,
N.Y.
Nuovo Cimento 37, 1228-1231 (1965)
Costs (Storage Ring) = ainfrastructure · R + bRF · E4/RCosts (Linear Collider) = cinfrastructure + RF · L
a,b well known : no increase beyond 200 GeV in storage ringsThe BIG question : what is c ?
History
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
High RF-PowerHigh RF-Transfer Efficiency
Low Emittance :
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E-smearing
LC Luminosity - where to put the Effort
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
The SLAC SLC Project
L = 1030 cm-2 s-1
Ecms = 100 GeV
σy = 600 nm
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Electron Side Positron Side
Electron Damping Positron Damping
Positron Production
Beam Delivery
FEL
The DESY TESLA Project
L = 3·1034 cm-2 s-1 Ecms = 500 GeV σy = 5 nm
Key Technology taken from TESLA TDR to ILC :SC Cavities at 1.3 GHz (L-Band)
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
XFEL 20 GeVAccelerator underconstruction atDESY
928 TESLA / ILCtype SC RF-cavities
„Calibration project“for the ILC
The XFEL at DESY
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
• Ecms adjustable from 200 – 500 GeV
• Luminosity ∫Ldt = 500 fb-1 in 4 years
(corresponds to 2*1034 cm-2 s-1 )
• 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
ILC Reference Physics Parameters
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Organisation : Global Design Effort - Set up by ILCSC via ICFA
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
ILC Timeline (GDE, Barry Barish, FNAL, June 2007)
now
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
ILC overall stage 1 layout in RDR (Reference Design Report) 2007
Main cost saving features :
„Central Campus“ with Experiments, Sources and Damping Rings (requires 14km long 5GeV beam transport systems over full length)
Single Beam Delivery System (Push-Pull for 2 Detectors)
11.3 km
6 km (150 GeV)
C = 6.7 km
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
2 Tunnel scheme for mainlinac (4.5 m diameter)
ILC cryomodule design
Main Linac Structure
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Basic ILC Technical RDR Parameters
MW~230Total AC Power Consumptionkm31Total Site Lengthms0.95Beam pulse lengthMV/m31.5Average accelerating gradientHz5Repetition ratemA9.0Beam Currentcm-2s-1~2x1034Peak LuminosityGeV500Max. Center-of-mass energy
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Main Linac RF Unit Overview
• Multibeam L-band klystron (10 MW)• 3 Cryostats (9+8+9 = 26 cavities)• 1 Quadrupole at the center• 278 positron units, 282 electron units (14560 cavities)• Nb cavities operating at 2K
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Cavities• Baseline: TESLA-type 1.3 GHz
– Identical to XFEL cavities• Only beamtubes shortened
• Accelerating gradient– Average gradient in cryomodule
• 31.5 MV/m, Q>1x1010
• With the presently available technology– Average gradient lower than 31.5 MV/m– Spread of gradient large – If uniform distribution in 22<G<34 MV/m, average 28 MV/m: Cost increase ~7 %
ILC 9-Cell Cavity undervertical test at Cornell
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
RF Cavity R+D Programme
Establish 36 MV/m in low power tests
Single Cells : Optimise surface preparationProduction like process of full size cavities
Establish high yield before EDR
Establish 31.5 MV/m in accelerator modules
200 µm 200 µm
Buffered chemical polishing Electro-Polishing
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
• Undulator scheme - Baseline (Alternatives : e on target, Compton)
– Input Electron beam at 150 GeV, 6 km upstream
– Undulator• Helical, superconducting• length 147 m (longer for polarized e+)
Positron Source
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
BDS (Beam Delivery System)
From main linac exit to the IP (Interaction Point)and to the beam dump
Roles of BDS• Focus the beam to the desired spot size for
collision• Remove beam-halo to minimize the background
events• Protect the beamline and detectors against mis-
steered beam• Diagnostics of the linac beam (Spectrometry)• Safely dump the spent beams
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Interaction Region - Experiments
• Single IR, 14 mrad crossing angle, 2 Push-Pull detectors
• Large cost savings compared to 2 IR solution :– ~200 M$ compared with 2 IR with crossing angles 14 + 14
mrad (even more if one IR has “small angle” crossing)
• Push-pull detectors– Task force from WWS (World Wide Study) and GDE formed– Conclusion so far
• No show-stoppers• But need careful design and R&D works
Not excluded, but not baseline :
2 IR with (fast or slow) beam switch (luminosity sharing)
1 IR with 1 stationary detector
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
detectorA
detectorB
may beaccessibleduring run
detectorB
detectorA
IR Hall for push-pull (evolving concept)
detectorA
detectorB
Platform for electronic andservices (~10*8*8m). Shielded(~0.5m of concrete) from fivesides. Moves with detector.
accessibleduring run
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Beam Delivery System Layout
2.2 km vs 2 m
view
1 km vs 2 m
view
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Crab Crossing
• Large crossing angle14mrad
• Need to deflect headand tail oppositely
• Special Crab cavity– 3.9 GHz SC– phase tolerance ~60 fs– prototype fabricated
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
ILC CostsThe reference design was“frozen” on for RDR production,including costs.
This is a snapshot. The design willcontinue to evolve, due to R&D,accelerator studies & valueengineering.
The value costs havealready been reviewedmany times.
Σ Value = 6.62 B ILC Units
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)
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
BCD Construction Startup
2006 2010 2014 2018
RDR EDR BeginConst
EndConst
EngineerDesign
All regions ~ 5 yrs
Siting Plan being Developed
SitePrep
SiteSelect
R & D -- Industrialization
DetectorInstall
DetectorConstruct
Future - A Technically Driven Timeline
Karlheinz Meier. Heidelberg, 31st Johns Hopkins Workshop
Summary and Outlook
• Rather detailed Reference-Design für the ILC available
• Reliable Costing based on RDR has been carried out
• Strong R+D Programme in the US, Asia and Europe
• Engineering Design Phase to start now
• Supported by EU in Europe
• Large scale industralized production of > 10.000 31.5 MV/m Cavities is amajor challenge
• Technically driven time planning available with ILC operation startingbefore 2020
• Experiements being planned (call for LoIs likely to happen this year ornext year)
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