1. Long Fruitful collaboration between DESY and Japanese institutes On High energy physics DASP at DORIS 1973- JADE at PETRA 1976- Initiated by professor Masatoshi Koshiba since 1973 ZEUS at HERA 1992- LHC 2009- Katsuo Tokushuku KEK

2. The ATLAS Detector Dimensions ： ~25x25x46m Weight ： 7000 ton ⇒ density 0.31g/cm 3 1/11/20072

3. 2016/6/33 ATLAS Detector: construction and commissioning Length : ~ 46 m Radius : ~ 12 m Weight : ~ 7000 tons ~ 10 8 electronic channels ~ 3000 km of cables 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 Superconducting Central Solenoid (Japanese contribution:100%) Time-to-digital conversion chips for muon drift tubes (100%) End-cap muon triggering system (TGC) (~50%) Silicon microstrip tracking system (SCT) (~20%) and Trigger (Muon/Tau HLT, Muon menu) ! <- collaboration with DESY

4. 2016/6/34 ATLAS-KEK (active) members K. Tokushuku (Leader, HLT) TGC H. Iwasaki, (M. Ishino left to Kyoto) TGC LVL-1 (+ upgrade) Trigger O. Sasaki + 1 student SCT (+upgrade) Y. Unno, S. Terada, Y. Ikegami, Y. Takubo (IBL) + 1 student (J. Tojo left to Kyushu) HLT K. Nagano(muon), S. Tsuno(tau) Physics S. Tsuno ( Tau ) K. Nagano ( W+c, etc.) + 3 students J. Kanzaki (Top) + 1 student Generators J. Kanzaki (Madgraph on GPU), S. Odaka (gamma gamma; GRACE) permanent staff only (+ few students) No post-docs! -> Close collaboration with JP universities

5. Trigger related issues

6. KEK-ATLAS activities on Muon Trigger and High Level Trigger (HLT) (K.Nagano) ATLAS Trigger System consists of three levels: -- Level-1: Synchronized, hardware-based (custom-made electronics) -- Level-2 and Event Filter (before and after event-building), called Higher Level Trigger (HLT) altogether. Software-based, making use of commodity products e.g. PCs KEK-ATLAS has been working on the muon trigger, in particular HLT muon trigger since year 2006, in the following topics: -- Coordination of ATLAS Muon Trigger Group * K.Nagano: 2010.3 〜 2012.2 Deputy convener 2012.3 〜 Convener -- ATLAS Muon Trigger “Menus” * Logic and strategy formulation * Development and maintenance of the logic software -- Level-2 muon-standalone trigger algorithm * Development, commissioning and performance evaluation with the LHC real collision data * Redesigning and upgrading the current software -- Development of the trigger analysis software framework

7. Some highlights from KEK-ATLAS muon trigger activities  Development of trigger analysis framework  Master’s thesis  Widely used in Trigger Community  L2 muon-standalone trigger performance evaluation  Master’s thesis  ATLAS-CONF-2010-095 LHCC meeting May/2010 (O. Igonkina)  Muon Trigger Menus formulation  ATLAS Muon Trigger Coordination 2009 runs (900GeV)  ATLAS-CONF-2010-013 2010 runs (7 TeV)  ATLAS-CONF-2010-095 “Trigger paper” Eur.Phys.J C72 (2012) 1849 2011 runs (7 TeV)  CONF note in preparation Stable, high efficient, and robust (wrt pileup) performance

8. KEK-ATLAS activities on Muon Trigger Upgrade Feasibility study on Level-1 (L1) Muon trigger upgrade -- Understanding of backgrounds in muon system and origin of L1 muon trigger rates -- Feasibility study to establish new cuts R&D studies for Level-1 Muon trigger by using Monitored Drift Tubes (precision chambers)

9. Standard Model H ->  search (S. Tsuno)  Use double hadronic tau trigger.  Nice peak at Z. (well-control of QCD events)  Make use of “boosted event topology”. https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CON FNOTES/ATLAS-CONF-2012-014/  Introduction of new categories in leplep- and lephad-channel, (4 categories in leplep, 7 in lephad-channel)  Inclusion of hadhad-channel (al hadronic). H ->  -> hadhad (all hadronic) channel : Major update from the previous search : Collinear mass in hadhad-channel

10. H->  sensitivity lephad channelhadhad channel The expected sensitivity is almost comparable between lephad- and hadhad-channels. Combined sensitivity is around 3.0xSM at mH=125 GeV. Combined sensitivity with all channels; leplep, lephad and hadhad. hadhad-channel is comparable with lephad-channel.

11. Prospect of tau performance Most of “tau”-physics analyses are going to use the combined trigger with “tau”. Offline tau reconstruction will be more and more deeply connected to the tau trigger performance. - desired to have a synchronized algorithm between offline and trigger. - detailed understandings in term of “trigger performance”. Plots show the presence of pi0 in the tau decay will prevent the efficient reconstruction at L1 with isolation requirement. 3-prong + no pi0 3-prong + pi0 Trigger efficiency measurement will be crucial for combined trigger. L1 Constant isolation degraded high pT but also by presence of pi0 in tau decay. ⇒ need better idea

12. Tracker related issues

13. ATLAS detector upgrade plan 2013201420152016201720182019202020212022 High-Luminosity LHC 5x10 34 cm -2 s -1 ultimate design luminosity 1-2x10 34 cm -2 s -1 toward design luminosity 14TeV -1x10 34 cm -2 s -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

14. Beam tests Pixel sensor beamtest at DESY - KEK/HPK planar pixel sensors modules with the EUDET telescope in the T21 beamline at DESY EUDET telescope Pixel modules Strip sensors beamtest (RNCP) Strip-IRAM telescope At RNCP of Osaka Univ., e.g. – 392 MeV protons, ~80 Hz At DESY – 4 GeV/c electron, ~4 KHz Possible cooperation – Beamtests at DESY – EUDET telescope modules

15. Development of Strip Sensors KEK – Major developer of the silicon sensors (strips and pixels) – Novel p-type sensors for HL-LHC – Focusing barrel sensors DESY – Focusing endcap sensors Possible cooperation – Strip sensors development and evaluation – Study with miniature sensors – 95 miniature sensors have been at DESY – Lorentz angle study with BZ3 etc. – Irradiations, beamtests, … P-type strip sensor 6-in. barrel wafer 10 cm x 10 cm barrel sensor

16. Modules, Macro Assemblies KEK (+Univ. Geneve) – High thermal conductivity Cu/Polyimide hybrids Carbon-carbon substrate bridge – Macro assembly Carbon-carbon cooling plates Bus cable SMC (SuperModule Control) hybrid Possible cooperation – Engineering materials available in Japan – SMC hybrid design – Bus cable development Macro assembly with ABCN13 chips ABCN25 Doubleside 80 chips module

17. Universal DAQ module Si-TCP – Technology to realize TCP/IP and UDP communication with FPGA. – IEEE Trans. Nucl. Sci. Vol. 55, No. 3, 2008 – Data transfer rate: 100 Mbps (The latest version: 1 Gbps) – All the libraries for the communication is prepared in Unix-based OS – User can focus on only development of program in User-FPGA SEABAS board – 4 sub-cards dedicated for each test can be attached Possible cooperation – SEABAS board availability – Application for specific DAQ system Strip sensors beamtest

18. Activities on accelerator upgrade

19. Nb 3 Al cable produced by NIMS-KEK collaboration. Nb 3 Al has better performance then Nb 3 Sn at the high stress condition. (But not it turned out that R&D took longer. -> R&D for HE-LHC) Design work for the separation magnet D2 Toward the LHC upgrade (accelerator R&D) Recently the design group for High-Luminosity LHC is formed. KEK is contributing to the R&D for the two key technologies: High-field magnet for the IP regions, Crab cavity, High-power injector in close collaboration with CERN and the other labs

20. JLAB CI/DL KEK BNL SLAC Various designs of crab cavity 5 cavities newly installed in CERN PS-B. New metal alloy (FT3L) developed for J- PARC upgrade is used. Toward the LHC upgrade (accelerator R&D) Recently the design group for High-Luminosity LHC is formed. KEK is contributing to the R&D for the two key technologies: High-field magnet for the IP regions, Crab cavity, High-power injector in close collaboration with CERN and the other labs

21. 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. Collaboration on physics analyses can be done at the personal level. Once there is a common interest, it is worth to try to get a fund (JSPS/DAAD JP-DE fund). KEK-CERN collaboration on the LHC accelerator upgrade is in place.