Download - Alors, c’est fini! Et maintenant?
Alors, c’est fini!Et maintenant?
Machine Upgrade in Stages
• Push LHC performance without new hardware– luminosity →2.3x1034 cm-2s-1, Eb=7→7.54 TeV
• LHC IR upgrade – replace low- quadrupoles after ~7 years
peak luminosity →4.6x1034 cm-2s-1
• LHC injector upgrade– peak luminosity →9.2x1034 cm-2s-1
• LHC energy upgrade– Eb→13 – 21 TeV (15 → 24 T dipole magnets)
Indicative Physics Reach
Approximate mass reach machines: s = 14 TeV, L=1034 (LHC) : up to 6.5 TeV s = 14 TeV, L=1035 (SLHC) : up to 8 TeV s = 28 TeV, L=1034 : up to 10 TeV
Units are TeV (except WLWL reach) Ldt correspond to 1 year of running at nominal luminosity for 1 experiment
† indirect reach (from precision measurements)
Ellis, Gianotti, ADRhep-ex/0112004+ updates
PROCESSLHC
14TeV100 fb-1
SLHC14TeV
1000 fb-1
SLHC28TeV100 fb-1
LinCol0.8 TeV500 fb-1
LinCol5 TeV
100 fb-1
Squarks 2.5 3 4 0.4 2.5
WLWL 2σ 4σ 4.5σZ’ 5 6 8 8† 8†
Extra Dim (δ=2) 9 12 15 5 - 8.5† 30 - 55†
q* 6.5 7.5 9.5 0.8 5
Λcomp 30 40 40 100 400
TGC (λγ) 0.0014 0.0006 0.0008 0.0004 0.00008
ILC as N’th Generation e+e- Collider
2010 …
Precision Physics at the Terascale
• Elementary particles
• Well-defined
– energy
– angular momentum
• Uses full CoM energy
• Produces particles democratically
• Can mostly fully reconstruct events
• Need to know what energy is interesting
LHC ILC
Higgs Event Topology
e+ e– → Z H Z → e+ e–, H → b b
H
ttHWbWbbbljjbbbb
Bkg.
ATLAS
ILC ( e+e-→HZ production )
Typical numbers
Tagging efficiency~ 30-50 %
S/N > 130fb-1
500fb-1
LHC & ILC Higgs Signals
Mh = 120 GeV
• The ILC can measure the spin of any “Higgs” produced
• Measure the energy dependence of the production cross section from threshold
What Kind of “Higgs” is it ?
Measure the quantum numbers. The Higgs is a scalar
Precision Measurement of Higgs Couplings
i im v
SM
“Beyond SM”
ILC Precision
SUSY and Dark Matter
Dark Matter favored regions in cMSSM parameter space
LSP neutralino mass and precision on relic density at LCC1
ILC Reference Design
12
• Basic element of the technology is a nine-cell 1.3 GHz niobium cavity.
• Approximately 160 of these cavities have been fabricated by industry as part of R&D program at DESY.
A Primary Cost Driver for ILC -- Superconducting RF Technology
Theoretical Limitation on Accelerating Field accE
pH pE• Type II Superconductor can
support a magnetic field before quench.
• Formerly optimized to control field emission. Cf. TESLA
• New surface treatments stop field emission from being limitation.
• Allow optimization of for highest .
p accE E
pH
p accH EaccE
2 2
2T CM RF Cryplant Cryoop Beampower
Total cost = Tunnel(1 Eacc )+Cryomodul(1 Eacc )+RF(Eacc)+Cryoplant(Eacc ) Cryo-Operation(Eacc ) Beampower(const)1 =[C +C ] C Eacc + [C C ] Eacc C
Eacc
ILC500 Gradient dependence with tunnel length and cost
20 25 30 35 40 45 5020
25
30
35
40
45
50
ILC500 L T=500E3/(0.7*Eacc)+7 Fill factor=0.7, BDS=7km
Eacc [MV/m]
TESLA
ILC BC
ILC AC(acteptance)
20 25 30 35 40 45 50 55 600.98
1
1.02
1.04
1.06
1.08
1.1
1.12
1.14
1.16
1.18
1.2
Rela
tive
Cos
tEacc [MV/m]
TESLA
ILC BC
ILC AC (acceptance)
Why Aim for Higher Gradient ?
ICHIRO Cavity
Goal : 51 MV/m
.
• Light Chemical Polishing (CP) HF(46%) : HNO3(60%) : H3PO4(85%) 1 :1 : 1 in volume
• CP for 1 minute at 25 OC.
• Removal thickness = 10 μm.
• Prepare smooth surface before EP.
• Annealing/Degassing in furnace
750 OC for 3 hours
• Degassing of hydrogen important.
• Temperature and time optimized for cavity softness and cost.
Light Chemical Polishing Annealing - Degassing
Tests @ TRIUMF