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DESCRIPTION
TLEP : ( some ) Main Questions a nd Concluding Remarks. R. Aleksan IOP Uni. College London November 29, 2013. TLEP : e + e - , up to √s ~ 350 GeV (possibly 450-500 GeV ). 80-100 km tunnel. PSB. PS (0.6 km). SPS (6.9 km). LHC (26.7 km). VHE-LHC : pp , √s ~ 100 TeV - PowerPoint PPT PresentationTRANSCRIPT
PSBPS (0.6 km)
SPS (6.9 km)
LHC (26.7 km)
TLEP : e+e-, up to √s ~350 GeV(possibly 450-500 GeV)
VHE-LHC : pp, √s ~ 100 TeV in same tunnelincluding possibly ep collisions and/or gg collisions if needed
(CERN implementationcapitalizing on existing infrastructures
80-100 km tunnel
TLEP : (some) Main Questionsand Concluding Remarks
R. AleksanIOP Uni. College London
November 29, 2013
Why such machines?
Recommendation #2
High-priority large-scale scientific activities in European Strategy
d) To stay at the forefront of particle physics, Europe needs to be in a position to propose an ambitious post-LHC accelerator project at CERN by the time of the next Strategy update, when physics results from the LHC running at 14 TeV will be available.
CERN should undertake design studies for accelerator projects in a global context, with emphasis on proton-proton and electron-positron high-energy frontier machines. These design studies should be coupled to a vigorous accelerator R&D programme, including high-field magnets and high-gradient accelerating structures, in collaboration with national institutes, laboratories and universities worldwide.
We should develop a strategy toward very High Energy … …possibly with the same complex?
Standard Higgs and nothing else
Non standard Higgs and/or new physics
Depending of NP scale e+e- and/or pp : CLIC or TLEP+VHE-LHC or VHE-LHC directly
after LHC @14 TeV
When What
Decision in 2018
e+e- Collider : e.g. TLEP, ILC
VHE-LHC (pp 100 TeV)or mm collider (if new physics hints <5 TeV)
Possible Strategy for Future Large Scale Accelerator
Ambitious milestones have to be set up STEP 1: Interim CDR in ~2 years STEP 2: a-CDR in ~5 years, in a timely fashion with an
update of the European Strategy in 2017-18
2010
2015
2020
2025
2030
2035
2040
LHC
HL-LHC R&D + constr
TLEP* Design + R&D + construction
VHE-LHC* Design + R&D + construction
A technically possible timeline (to be confirmed by the DS) ?
Can TLEP come timely?
Enough inputs is needed to decide PP-direction in 2018
Is a start in early 2030’s realistic?
Establish
The “consolidated” physics case
The Reference Baseline Design
The required R&D programme
A Technically Realistic Schedule
A Reliable Cost Estim
ate
What is the TLEP maximum luminosity?
0 500 1000 1500 2000 2500 3000 35001
10
100
1000
10000Luminosity vs Energy TLEP(1-IP)
ILCCLICTLEP(4-IP)
Center of Mass Energy (GeV)
Lum
inos
ity (x
1033
cm-2
s-1
) Z; >2 1036
WW; 6 1035
HZ; 2 1035
tt; 5 1034
TLEP: Instantaneous lumi at each IP (for 4 Ips) Instantaneous lumi summed over 4 IPs
Luminosity is THE key parameter for TLEP programme!
STEP1: Main general parameters need to be established by interim report (~end 2015)
Amongst which Main critical accelerator parameters (emittance, ratio, BB
tune shift…) Initial lattice Polarization feasibility (transv., longit.) vs energy Beam energy measurement and spread Frequency of RF system and max. feasible CW gradient Number of rings (Injection ring + 2 separate collider arcs ?
Can one use common strait sections for high energy (>340 GeV)
Where is the injector ring located at the IR? Injection complex (can one reuse existing infrastructures?)
Initial Assessment of maximum reachable luminosity vs energy?
Many sub-questions to be answered
STEP 2: advanced Conceptual Design (2017-2018)
Would require R&D work on critical issues RF system
CW Cavity structures and maximum gradient reach RF source (Klystrons, IOT, SSD) and efficiency Maximum power per cavity and coupler
Magnet system Low cost technology (~200km may be needed) Is it a dream to think of wide range of field (70-14000G)
Vacuum system (100MW not worse than LEP 8W/cm) Issue is the cost and time for coating
Efficient Energy management Can one recuperate energy Can one optimize its use a operation flexibility
Technical feasibility demonstration of critical components
Assessment of reference maximum reachable luminosity vs energy and critical technical component feasibility
If operate TLEP and LHC simultaneouslyEnergy management?
Achievable luminosities? Manpower?
Is it useful to have concurrent or simultaneous TLEP and LHC operation?
Even more challenging Can one operate TLEP and VHE-LHC
simultaneously?Energy management?
Achievable luminosities?
How and Which New Physics Energy scale can be probed?
Actual MH
(HL-LHC)
TLEP Indirect:MH=94.0 ± 1.4Direct: MH=125.500 ±0.007.
LHC(300) LHC (3000) TLEP (240+350)
DmH (MeV) ~100 ~50 ~7
DGH/G H
(DGinv)--(14) --(7) 1.0(0.45)%
H spin P P P
DmW (MeV) ~10 ~10 <0.5
Dmt (MeV) 800-1000 500-800 10
DgHVV/gHVV 4-7%* 2%* 0.15-1.5%
DgHff/gHff 6-13%* 2- 7%* 0.2-0.7%
DgHtt/gHtt 14%* 7%* ~13%
DgHHH/gHHH -- ~30%? --
Could be significantly improved at VHE-LHC?
…but also Higgs properties
Channels Production/year Physics
t+t- 3 1010 pairs Rare decays, conservation laws…
c or b quarks > 2 1011 CP violation, rare decays…
e.g. > 3 1010 Bs Large Bs sample with clean environmentwithin SM, > 1000 Bs g t+t- detected
Can we do better?
What are the limitation from theory?
How/up to which level can these be overcome? “ultimate”?
What specific
new physics and scale is TLEP sensiti
ve to?
Is this c
ompetitive if L
HC does not see new physics?
…and even sterile neutrinos from Z decays
0 20 40 60 80 100 120 1400.001
0.01
0.1
1
TLEP sensitivity to heavy n mass eigenstate
M4
|4|
SUa
²
0 20 40 60 80 100 120 1400
0.20.40.60.8
11.2
TLEP sensitivity to heavy n mass eigenstate
M4
Ut4
S. Lavignac
If Nn=3 ± 0.001 is measuredthen one set limits on U 4a mixing
…but can we beat down the Bhabha Xsection calculation?
What are the main detector characteristics needed? We should benefit from all the work done for ILC
detectors!
Establishing rapidly the simulation and analysis
software framework is vital
Is there any detector R&D needed specific to TLEP?
Si Vertex tracker seems unavoidable TPC is a great device (see LEP) but is it usable at
TLEP ? (ions back flow, heat of electronic (10kW/m² ), …) else all Si Tracker is a viable option
What is the needed resolution of EM calorimeter? Is W/SiPad calo needed? Is LAr a crazy option?
Does one need PID? Can one reuse magnet systems (CMS)?
Need to integrate the advantages of TLEP• Low Beamstrahlung
Less dilution of Xsections at threshold (WW,ZZ,ZH,tt) Excellent beam energy knowledge Beam energy-mometum constraints Less background Easier luminosity measurement
Tunnel: What is the optimal size ?
Main drivers:
Physics (>80 km for 3
50 GeV but the larger th
e better)
Geology/Tunneling Risks
Costs
Credible Accelerator costing is mandatorySeveral costing method should be used to gain confidence (i.e. analogical, parametrical and analytical methods) A preliminary assessment is needed at the interim CDR A reference cost for the a-CDR is essential
Overall TLEP Cost is the crucial element, which will make the project possible or not
Personnal opinion :It should not be much larger than LHC:Accelerator: (LHC + LEP-tunnel*inflation
(4.2 + 0.7*1.5) = 5.2 BCHF Detectors: 1.2 BCHF Cost is likely to drive the number of detectors
Infrastructuretunnels, surface buildings, transport (access roads), civil engineering, cooling
ventilation, electricity, cryogenics, communication & IT, fabrication and installation processes, maintenance, environmental impact and monitoring,
safetyHadron colliderOptics and beam dynamicsFunctional specifications
Performance specsCritical technical systemsRelated R+D programsHE-LHC comparison
Operation conceptDetector concept
Physics requirements
Hadron injectorsBeam optics and
dynamicsFunctional specs
Performance specsCritical technical
systemsOperation concept
e+ e- colliderOptics and beam dynamics Functional specifications
Performance specsCritical technical systemsRelated R+D programs
Injector (Booster)Operation conceptDetector concept
Physics requirements
e- p option: Physics, Integration, additional requirements
Future Circular Colliders - Conceptual Design Study
for next European Strategy Update (2018)
Next Steps: Setting up the FCC Study
Infrastructure
Hadron collider conceptual design
Lepton collider conceptual design
Hadron injectors
Safety, operation, energy management
environmental aspects
Machines and infrastructure
conceptual designs
High-field magnets
Superconducting RF systems
Cryogenics
Specific technologies
Planning
Technologies R&D activities
Planning
Hadron physics experiments
interface, integration
e+ e- coll. physics experiments
interface, integration
e- - p physics, experiments,
integration aspects
Physics experiments detectors
Main areas for design studyPreparatory group for a kick-off meeting => Steering committee
Kick-Off meeting in the
CERN Region
February 12-14, 2014
Divide the work in self consistent and well identifiable sub-tasks
Setting up a truly international collaboration
Mandatory if we want to succeed in this endeavor
Should be set up at the very beginning of the effort at all levels so that collaborators have
ownership
FCC needs to gain visibility and support at • The international scientific level (consensus is vital)• The EC level• The national levels • The local (Geneva, Ain, Haute Savoie)
A lot o
f work ahead!
TLEP has a beautifu
l Physic
s
and Technica
l case
Join us