PowerPoint プレゼンテーション

56 Pages·2017·6.66 MB·English

by  Yamamoto Akira

International Linear Collider:

- Technical Status and Readiness -
Akira Yamamoto and Shin Michizono
(KEK/LCC)

Presented at IAS Concerence, Hong Kong, 24 Jan., 2017
A. Yamamoto, 170123 1
Outline
• Introduction
• Technical Progress and Status
‒ Nano-beam technology
‒ SRF technology
‒ Civil engineering
• Readiness for the Project
‒ Further effort for the cost reduction and the R&Ds
• Summary
A. Yamamoto, 170123 2
ILC GDE to LCC
1980’ ~ Basic Study
2004 2006 ‘07 ‘08 ‘09 ‘10 ‘11 ‘12 ‘13 ‘14 ‘15 ‘16 ‘17
ILC-GDE LCC
Ref. Design (RDR)
TDR
Technical Design Phase
TDP 2
TDR publication

LHC
126 GeV
Higgs
discovered
Selection of
2013.6.12
SC Technology
2012.12.15
A. Yamamoto, 170123 3
Important Energies in ILC
125 GeV Higgs discovery reinforcing the ILC importance
Integrated Luminosity (ab-1)
K. Kawagoe
2 (modified)
HHZ
Physics confident: H
 Higgs and Top Quark
New Physics beyond SM:
 Learn “everything” about H (125)

 Probe dynamics of EWSB
 Direct or indirect DM searches
1  Evidence for BSM physics
 Hints of a new mass scale
HZ ννH
tt
LEP
ttH
reached

200 300 400 500 600 E (GeV)
cm
A. Yamamoto, 170123 4
ILC Acc. Design Overview (TDR)
Damping Ring
e- Source
e+ Main Liinac
Physics Detectors
Item Parameters
e+ Source
C.M. Energy 500 GeV
e- Main Linac
Key Technologies Length 31 km
Luminosity 1.8 x1034 cm-2s-1
pre-accelerator
few GeV
source Repetition 5 Hz
Nano-beam Technology
KeV
Beam Pulse Period 0.73 ms
damping extraction
ring SRF Accelerating Technology & dump Beam Current 5.8 mA
few GeV 250-500 GeV
few GeV final focus
Beam size (y) at FF 5.9 nm
IP SRF Cavity G. 31.5 MV/m
bunch
main linac
compressor collimation Q Q = 1x10 10
0 0
A. Yamamoto, 170123 5
Nano-beam Technology
pre-accelerator
few GeV
source
KeV
damping extraction
ring & dump
few GeV 250-500 GeV
final focus
few GeV
IP
bunch
main linac
compressor collimation
- Electron and Positron Sources (e-, e+) :
- Damping Ring (DR):
）
- Ring to ML beam transport (RTML :
）：
- Main Linac (ML SCRF Technology
）
- Beam Delivery System (BDS
Nano-beam technology advanced by ATF Collaboration, hosted at KEK.
A. Yamamoto, 170123 6
SRF Technology
pre-accelerator
few GeV
source
KeV
damping extraction
SRF Technology
ring & dump
few GeV 250-500 GeV
final focus
few GeV
IP
bunch
main linac
compressor collimation
- Electron and Positron Sources (e-, e+) :
- Damping Ring (DR):
）
- Ring to ML beam transport (RTML :
）：
- Main Linac (ML SCRF Technology
）
- Beam Delivery System (BDS
A. Yamamoto, 170123 7
Advantage of Superconducting RF
Ultra-high (Q =1010): Luminosity:
0
- small surface resistance  nearly
RF efficiency RF power / beam current
zero power (heat) in cavity walls

Vertical
Long beam pulses (~1 ms) emittance
(tiny beams)
 intra-pulse feedback

Larger aperture
 Luminosity proportional to RF efficiency ILC
  better beam quality w/ larger aperture -  ~160MW @ 500GeV
lower wake-fields

 Capable of efficiently accelerating
 Work necessary on engineering for:

high beam currents
- Cryomodule (thermal insulation)

- Cryogenics
 Low impedance aids preservation of
high beam quality (low emittance)
A. Yamamoto, 170123 8
Outline
Introduction
Technical Progress and Status
‒ Nano-beam technology
‒ SRF technology
‒ Civil engineering
Readiness for the Project
‒ Further effort for the cost reduction and the R&Ds
Summary
A. Yamamoto, 170123 9
Progress in Acc. Technology for the ILC, in ~ 2016
Two Key Technologies matured for the project realization !
：
• Nano-beam Technology
）
KEK-ATF2: FF beam size (v): 41 nm at 1.3 GeV (to go 37nm, equiv. to 6 nm at ILC
：
• SRF Technology
European XFEL: SRF Cavity completion, 100% (800) reaching <G> = ~ 30 MV/m.
‒ Cryomodule (CM), 100% (100) reaching <G> =~28 MV/m
‒ Installation into acc. Tunnel completed, and cool-down just started,
：
Fermilab CM (8 cavity string) reaching ILC gradient: <G> > 31.5MV/m
‒ New Surface process “N2 Infusion” demonstrated for High-Q and High-G
KEK: CM (8-cavity string) reaching : <G> > 31 MV/m
US-Japan: Cost Reduction R&Ds started, reflecting recent technical advances
Issue and Prospect:
• Cost-reduction to start the project with the staging at C.E. 250 GeV, Higgs Factory,
is to be studied, in addition to the cost-reduction R&D efforts

A. Yamamoto, 170123 10