1. Long Fruitful collaboration between DESY and Japanese institutes
On High energy physics
Initiated by professor Masatoshi Koshiba since 1973
JADE at PETRA
ZEUS at
HERA 1992-
DASP at DORIS
LHC 2009-
Katsuo Tokushuku
KEK

2. ATLAS Detector: construction and commissioning
Superconducting Central Solenoid (Japanese contribution:100%)
End-cap muon triggering system (TGC) (~50%)
Silicon microstrip tracking system (SCT) (~20%) <- collaboration with DESY
Trigger (Muon/Tau HLT)
Tracking (||<2.5, B(solenoid)=2T) :
-- Si pixels and strips
-- Transition Radiation Detector (e/ separation)
Calorimetry (||<5) :
-- EM : Pb-LAr
-- HAD: Fe/scintillator (central), Cu/W-LAr (fwd)
Muon Spectrometer (||<2.7) :
air-core toroids with muon chambers
Length : ~ 46 m
Radius : ~ 12 m
Weight : ~ 7000 tons
~ 108 electronic channels
~ 3000 km of cables
2018/11/20

3. ATLAS-KEK (active) members Updates from last year
K. Tokushuku (Leader, HLT)
TGC H. Iwasaki, (M. Ishino left to Kyoto) <- new open position
TGC LVL-1 (+ upgrade) Trigger O. Sasaki + 1 student + 1 student
SCT (+upgrade(pixel/strip))
Y. Unno, S. Terada, Y. Ikegami, Y. Takubo (IBL) + 1student(graduated)
(J. Tojo left to Kyushu) K. Nakamura
HLT K. Nagano(muon), S. Tsuno(tau)
Physics
S. Tsuno,　K. Nakamura ( Tau )
K. Nagano ( W+c , etc.) + 3 students
J. Kanzaki (Top) student (graduated)
Generators
J. Kanzaki (Madgraph on GPU), S. Odaka (gamma gamma; GRACE)
permanent staff only (+ few students)
No post-docs!
-> Close collaboration with JP universities
2018/11/20

4. Trigger related issues

5. Some highlights from KEK-ATLAS muon trigger activities
Better performance if we can get information from small wheel.
-> Phase 0 : Add Small-wheel TGC information in the trigger logic.
-> Phase 1: Use the new small wheel information

6. KEK-ATLAS activities on Muon Trigger Upgrade
Phase 2: R&D studies for Level-1 Muon trigger by using Monitored Drift Tubes (precision chambers)

7. KEK-ATLAS activities on HLT
L1 Tau trigger improvement: with topological trigger -> S. Tsuno
HLT muon: -> K. Nagano.
Re-structuring the LVL2 Muon trigger with more transparent
and modular software framework.
-> easier for the collaboration with several groups (UK, US)

8. Tracker related issues

9. ATLAS detector upgrade plan
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
High-Luminosity LHC
5x1034 cm-2s-1
ultimate design luminosity
1-2x1034 cm-2s-1
toward design luminosity
14TeV -1x1034 cm-2s-1
Phase 1 minor upgrade:
An additional pixel layer
Replacement of Inner Endcap
muon chambers
Phase 2: Major upgrade:
Complete replacement
of the inner trackers
(All-silicon tracker)
R&D activities in Japan
R&D of radiation- tolerant sensors
Development of short strip detector module
R&D of pixel sensors
development of muon and combined triggers.
Good collaboration with DESY and German
institutes is essential

10. Activities on accelerator upgrade
KEK is contributing to the R&D for the two key technologies:
High-field magnet for the IP regions
High-power injector
in close collaboration with CERN and the other labs

11. HL-LHC Luminosity Leveling: various options
Replace the forcusing magnets around ATLAS and CMS.
Luminosity　Leveling: various options
Crab crossing
β* leveling
And upgrades for LHC injectors.

12. LHC Injector RF Amplifiers: Possible KEK conributions
LINAC4 （2018）
PS booster PS
SPS
LHC
ATLAS
RF Amplifiers:
Possible KEK conributions
Magnetic arroys in the RF cavity. (developed at J-PARC)

13. Very fruitful collaboration with CERN
J-PARC　neutrino beamline
LHC magnets
PSB: cavities
J-PARC　RF cavities

14. Large aperture (φ130~150mm) 6 Tesla magnet: saturation, flux leakage
International collaboration has started for the design work of the magnet system
～３００m
D1: KEK
Q1-3:
US-LARP(Nb3Sn) or
CERN(NbTi)
D2: BNL
Q4-6:
CEA/Saclay
JAEA Takasaki
Cryogenic γ-ray
irradiation Facility
Epoxy
(G10) CE
BMI BT 14
Radiation test at J-PARC
Challenges:
Large aperture (φ130~150mm) 6 Tesla magnet: saturation, flux leakage
High radiation dose: selections of rad-hard materials

15. International collaboration has started for the design work of the magnet system
D1: KEK
Q1-3:
US-LARP(Nb3Sn) or
CERN(NbTi)
D2: BNL
Q4-6:
CEA/Saclay
Last year
Latest design

16. Toward the futher LHC upgrade
Nb3Al has better performance then Nb3Sn
at the high stress condition. (But now it turned out that R&D took longer. -> R&D for HE-LHC)
Nb3Al cable produced by NIMS-KEK
collaboration.

17. Summary
In the ATLAS collaborations, KEK is responsible for TGC, Endcap LVL1 muon trigger, SCT and HLT.
For ATLAS upgrade, KEK is working for LVL1 muon trigger upgrade and tracker upgrade.
R&D for the silicon trackers (strips and pixels) are the most important activity in the next several years. In this area, a lot of collaboration between KEK and DESY are possible and plausible.
KEK-CERN collaboration on the LHC accelerator upgrade is in place.