Maxim Titov, CEA Saclay, Irfu, France
Evolution of the ILC Project &
International Development Team
Linear colliders: ILC, CLIC (technical extendability to TeV regime)
Circular colliders: CEPC, FCC-ee
Compact Linear Collider (CLIC):
CERN√s = 380 GeV, 1.5 TeV, 3 TeV Length: 11 km, 29 km, 50 km International Linear Collider (ILC):
Japan (Kitakami)
√s = 250 - 500 GeV, 1 TeV
Length: 21 km -31 km (50 km)
Circular Electron-Positron Collider(CEPC):
China
√s = 90 - 240 GeV
Circumference: 100 km
Future Circular Collider (FCC-ee):
CERN√s = 90 - 350 GeV
Circumference: ~100 km arXiv: 1901.09829
arXiv: 1901.09825
arXiv: 1812.07987 arXiv: 1812.07986
arXiv: 1901.03169 arXiv: 1901.03170
http://fcc-cdr.web.cern.ch/
Future Electron-Positron Colliders: “ Higgs Factory”
Higgs is so simple and so unnatural
a ”malicious choice”
!
M
HTODAY:
consistency so-far with the SM-like
Higgs Boson
FUTURE:
20x increase in statistics
Measurements of Higgs properties with increasing precision are a formidable tool to look for new-physics manifestations
experimental precision approaching theory precision even before using full Run 2 statistics
arXiv: 1902.00134
From Discovery to Precision: THE Higgs or A Higgs
Higgs Couplings Precision with ILC
Model-Independent EFT Fit (22-parameters)
~ 1 % or better reached for many couplings adding 500 GeV improves up to a factor of ~2
ILC(250 GeV) offers quantitative and qualitative improvement beyond information accessible at hadron colliders much better sensitivity to BSM !
Highly model-independent analysis of EFT:
Phys Rev D97, 053003 (2018)
Precision on Higgs Couplings and Synergy with HL-LHC:
~1 % required to access New Physics beyond HL-LHC
direct search
Precision has always been a window to new discoveries Different BSM models predict different deviation patterns
=> Help discriminate between different Higgs models based on new physics possibilities beyond SM
Deviations Patterns to Reveal New Physics via Nature of Higgs
The ILC250 has the capability to tell the nature of
the BSM from its deviation pattern!
250 GeV International Linear Collider Overview
e+e- centre-of-mass energy:
• first stage: 250 GeV (20 km tunnel)
• tunable; upgrades: 500 GeV, 1 TeV
• Other options: running at Z pole
& WW threshold
Luminosity:
Initial design L ~ 1.35 x 1034 /cm2/s (400 fb-1 during the first 4 years)
Upgrade 2.7 x 1034 /cm2 /s (doubling number of bunches per pulse – moderate cost (~10%));
Upgrade 5.4 x 1034 /cm2 /s (repetiton rate 5 10 Hz (expensive));
Beam polarisation
• P(e-) ≥ ±80%
• P(e+) = ±30%, at 500 GeV upgradable to 60%
Possible running scenario:
The International Linear Collider in a Nutshell
ILC Site Candidate Location in Japan: Kitakami Area
Oshu
Ichinoseki
Ofunato
Kesen-numa Sendai
Express- Rail High-way
Proposed by JHEP community Endorsed by LCC
Establish a site-specific Civil Engineering Design - map the (site independent) TDR baseline onto the preferred site - assuming “Kitakami” as a primary candidate
Need to finalize:
- IP / Linac orientation and length - Access points and IR infrastructure - Conventional Facilities and Siting (CFS)
IP Region
Earthquake-proof stable bedrock of granite.
No faults cross the line
Two Validated Detector Concepts: ILD and SiD
ILD_L / ILD_S SiD
Both optimized for PFA Performance: ~ B･RECAL,inner2 (two-track separation @ ECAL)
B = 3.5 T / 4 T B = 5 T
RECAL,inner = 1.8 / 1.46 m RECAL,inner = 1.27 m
Si + TPC tracking
Outer radius: 1.77 / 1.43 m Silicon Tracking only Outer radius: 1.22 m Re-optimisation: Large (L) & small (S) options
ILD Interim Design Report:
arXiv: 2003.01116
ILD-L ILD-S
Reduced tracker radius, length unchanged
ILD vs SiD: Two Tracking Complementary Approaches
Gaseous Tracking (ILD): Silicon Tracking (SiD):
Si + Gaseous Tracking System:
- VXD: long barrel of 3 double layers
- Intermediate Si-tracker (SIT, SET, FTD) SIT/FTD: silicon pixel sensors (e.g. CMOS) SET: silicon strip sensors
- Time Projection Chamber with MPGD-readout High hit redundancy (200 hits / track)
3D tracking / pattern recognition;
dE/dx information for PID
All Si-Tracking (concept proven by CMS) - VXD: short barrel of 5 single layers
- 5 layers Silicon-strip tracker
(25um strips, 50 um readout pitch) - Few highly precise hits (max. 12)
- Robustness, single bunch time stamping
Vertex detector Strip detector
Collaborations CLICPix
FPCCD
TPAC
LCTPC
DEPFET SOI ChronoPixel
CMOS MAPS GEM DHCAL
RPC DHCAL Scintillator ECAL
Silicon ECAL (SiD)
Silicon ECAL
(ILD) Dual Readout
Scintillator HCAL
RPC Muon
VIP KPIX
FCAL
SDHCAL
Many forms of Linear
Collider Detector R&D efforts:
Large collaborations: CALICE, LCTPC, FCAL
Collection of many efforts such as vertex R&Ds
Individual group R&D activities
Efforts currently not directly included in the concept groups (ILD, SiD, CLICdp), which may become important for LC in future
Collaborations CLICPix
FPCCD
TPAC
LCTPC
DEPFET SOI ChronoPixel
CMOS MAPS GEM DHCAL
RPC DHCAL Scintillator ECAL
Silicon ECAL (SiD)
Silicon ECAL
(ILD) Dual Readout
Scintillator HCAL
RPC Muon
VIP KPIX
FCAL
SDHCAL
Many forms of Linear
Collider Detector R&D efforts:
Large collaborations: CALICE, LCTPC, FCAL
Collection of many efforts such as vertex R&Ds
Individual group R&D activities
Efforts currently not directly included in the concept groups (ILD, SiD, CLICdp), which may become important for LC in future
https://doi.org/10.5281/zenodo.3749461 (DOI:10.5281/zenodo.3749461)
Final agreement among governments on construction
Full-scale negotiation among governments – specify conditions and processes Multi-lateral
Discussion
Government Level
2019Mar 2027
Strengthen US-Japan Discussion Group:
cost reduction R&D, governance discussion Discussion among governments
Exchange of information
Researchers Level
ICFA/LCB
@Tokyo
Pre-lab
2022 – 2026 [4 years]
＊ICFA: international organization of researchers consisting of directors of world’s major accelerator labs and representatives of researchers
＊ILC pre-lab: International research organization for the preparation of ILC based on agreements among world’s major accelerator labs such as KEK, CERN, FNAL, DESY, etc.
7-Mar-2019 MEXTpanel
Summarize opinions of relevant ministries
European Particle Physics Strategy Update (EPPSU)
EPPSU adopted by CERN Council
Agreement on governance, operation, sharing of cost and human resources
KEK International WG
Construction
2026 – 2035 [9 years]
Negotiations on international sharing [2019 fall–]
ICFA/LCB
@SLAC 20-Feb-2020
19-Jun-2020 Statement
by Japan Statement
by Japan
Transition
Phase Preparation Phase Construction7Phase
2021 2022 2023 2026
May 2019 – Oct 2019 2020Feb
Discussion Group with European partners:
[JP/DE: Jul 2019–] [JP/DE/FR/UK: Feb 2020–]
Good enough design for the final approval of construction, resolution of remaining technical issues SCJ Master Plan
Jan 2020
Input from US
International
Development Team
Aug 2020 – 2022 (2 years)
Collaboration of research labs Prepare for Pre-lab
and Accelerator/
Detector/Physics
Basic idea of international sharing of human and material resources
Processes and Approximate Timelines Towards Realization of ILC
Establish a preliminary list of the ILC Pre-lab tasks and deliverables (through WG2) and national/regional laboratories which might be interested in contributing to those;
Establish Pre-lab resources needs for the regional activities and central office (a few % of ILC cost);
Prepare a preliminary proposal for the ILC Pre-lab organization and governance:
Finalise all the inputs needed to set-up the Pre-lab;
International Development Team (IDT) Goals for 2021-2022
https://linearcollider.org/
arXiv: 2106.00602
IDT - WG1: Approximate Timeline of the ILC Realisation
ILC Pre-laboratory (~4 years)
- Complete all the technical preparation necessary to start the ILC project (infrastructure, environmental impact and accelerator facility) :
- Prepare scenarios for the regional contributions to and organisation for the ILC;
ILC laboratory
- Construction and commissioning of the ILC (~9-10 years);
- Followed by the operationof the ILC;
- Managing the scientific programme of the ILC;
ILC IDT (~2 years):
- Prepare the work and deliverables of the ILC Pre-laboratory and work out, with national and regional laboratories, a scenario for their contributions;
- Prepare a proposal for the organisation and governance of the ILC Pre-
laboratory;
Positive “signs” from the host country (Japan) government and agreements by the national/regional laboratories for providing
their contributions
Positive « outcomes « of the inter-governmental negotiations for the responsibility and cost sharing among the host (Japan) and partner countries
Set up four WG1 subgroups:
i. Pre-Lab organization
ii. Preferred legal base for the Pre-Lab iii. Necessary condition to start the Pre-Lab iv. Process to start the Pre-Lab
IDT – WG2: Technical Preparation Document
IDT-WG2 summarized the technical preparation as Work Packages (WPs) for the Pre-Lab stage in the Technical preparation Document
ILC - WG3: Physics and Detectors Timeline
Oct. 25-29, 2021: ILC Workshop on Potential Experiments (ILCX2021)
2022-2023: The IDT calls for EoIs, to be presented in a workshop after Pre-lab start
2022-2023: Potential start of the Pre-lab. EoI presentations in dedicated workshop. The process of moving from EoI presentations towards LoI documents is community driven.
Initial dedicated ILC R&D funds will be needed.
2023: LoI submissions and presentations. The ILCXAC will initiate its evaluation of the LoIs. R&D continues.
2024: ILCXAC recommendations of initial ILC experiments to proceed towards TPs.
R&D towards the TPs.
2025: TP submissions and presentations. Continuation of R&D and recommendations by the ILCXAC based on the submit-ted TPs.
2026-27: Approval of the experiments, based on the TP and ILCXAC recommendations, by a committee set up by the ILC Laboratory. Recommendations to proceed towards
Technical Design (TDR) Reports. Funding requests for construction are being prepared.
2027: The ILC laboratory allows construction to start and construction funding spending for experiments or experimental subsystems based on TDRs approvals.