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ATLAS Pixel Upgrade

ATLAS Pixel Upgrade. Norwegian CERN Committee review Bergen, 15-16 April 2009 Ole Myren Røhne University of Oslo. Overview and plans. Phase I: long shutdown after 3 years Phase II: major luminosity upgrade SLHC Past and present activites Plans for phase I and phase II.

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ATLAS Pixel Upgrade

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  1. ATLAS Pixel Upgrade Norwegian CERN Committee review Bergen, 15-16 April 2009 Ole MyrenRøhne University of Oslo ATLAS Pixel Upgrade - OMR/UoO

  2. Overview and plans • Phase I: long shutdown after 3 years • Phase II: major luminosity upgrade SLHC • Past and present activites • Plans for phase I and phase II ATLAS Pixel Upgrade - OMR/UoO

  3. LHC machine plans INTEGRATED LUMINOSITY Integrated Luminosity: 2008-17: 650 fb-1 2013-17: 550 fb-1 New injectors + IR upgrade phase 2 Before LHC incident: Add 1 year for a realistic schedule Long Shutdown (8 months) Peak Luminosity: 2017: 3x1034 cm-2s-1 Ultimate: 1x1035 cm-2s-1 SLHC Start-up Early operation Collimation phase 2 Linac4 + IR upgrade phase 1 Roland Garoby: Machine intro (LHCC 2008-07-01) ATLAS Pixel Upgrade - OMR/UoO

  4. Phase I: IBL concept 20.2mm • Original ATLAS plans: replace B-layer after 3 years • Study group recommendation: add Insertable B-layer (IBL) • Smaller radius beam pipe • Next generation electronics: FE-I4 in 0.13 μm CMOS • Pixel size: 50 × 250 μm2 • Sensor alternatives: n-in-n or 3D – or even diamond • Cooling alternatives: C3F8 or CO2 • Stave designs: Monostave or Bistave ~200μm 7.6mm ~19 mm active 16.8mm 8mm active ~2mm 2.8mm FE-I3 74% FE-I4 ~89% Giovanni Darbo (Genova): ATLAS IBL (LHCC 2009-02-16) Bistave Neal Hartman (LBNL) ATLAS Pixel Upgrade - OMR/UoO

  5. Phase I: IBL project organization • Core estimate: 9 MCHF – including beam pipe • Aiming for installation 2013-2014 • IBL project structure being put in place • Draft Technical Design Report (TDR) • Work Breakdown Structure (WBS) defined around deliverables: • Module (sensors, electronics, bump-bonding) • Stave (loading, opto, internal services) • Integration and installation • Off-detector (DAQ, DCS, Point-1 services) ATLAS Pixel Upgrade - OMR/UoO

  6. Phase II: ATLAS upgrade • Main challenges: • 400 collisions/BC • Radiation load at inner radius • Beam, cavern backgrounds • Completely new Inner Detector • Muons and forward calos also need upgrades • Install in 2018 • Core estimate: 250 MCHF • In work:LoI, ready by 2010 • MoU by 2011 ATLAS Pixel Upgrade - OMR/UoO

  7. Phase II: Inner detector Several straw man lay-out studied, common features: • Current TRT volume replaced by large strips • Inner radius SCT needs short strips/long pixels • Outer radius Pixels: 50 × 250 μm2 (IBL) • Inner radius Pixels: Smaller pixels, extremely rad.hard sensors and electronics Possible track trigger: under investigation ATLAS Pixel Upgrade - OMR/UoO

  8. Strategic approach • Contributions to the present ATLAS/SCT serve as the starting point for the Norwegian Upgrade effort • Activities within the Advanced Instrumentation project are already geared toward contributing to an upgrade of the ATLAS Pixel subsystem • Participating in Phase I (IBL) will serve as a learning experience, bridging the gap – in time and technologically • Ultimately, the aim is to make a recognizable contribution to the Pixel upgrade for Phase II. ATLAS Pixel Upgrade - OMR/UoO

  9. Present ATLAS/SCT hardware • Project ran from 1998 – 2005 • Collaboration with Uppsala (SE) • Delivered 1/6 of the SCT barrel modules • Norwegian contribution: • Core: 23 MNOK (1998) • Total: 44 MNOK (incl travel, personnel) • Project resources: • Clean rooms (UoB, UoO) • Electronics and mechanical workshops • Faculty and technical staff • Project personnel (engineers/Ph.D) ATLAS Pixel Upgrade - OMR/UoO

  10. 3D stave prototype(Bolle, Dorholt) • IBL concept calls for a stave design • Large FE-I4 ASIC: 16 × 16 mm2 • 3D tech allows μm-precision active edges • Demonstrator stave: Butted die-size sensor tiles • Recycled Pixel parts: FE-I3 and MCC • DRIE-cut 3D sensors and bump-bonding (Stanford MBC) • Carbon foam stave (LBNL) • Flex-hybrid and End-of-Stave controller (UoO) ATLAS Pixel Upgrade - OMR/UoO

  11. Fast track reconstruction(Strandlie, Gjersdal) • One of the most time consuming aspects of HEP data processing is track reconstruction, a fast track fitting algorithm is therefore crucial if track information is to be used on-line in a high luminosity enviroment like the sLHC. • The Kalman filter is the standard track reconstruction algorithm in HEP. Research done for the CBM experiment has shown that the speed of the Kalman filter can be greatly improved by : • Using an analytical approximation of the magnetic field • Rewriting the algorithm for single precision floats • Vectorizingthealgorithm (SIMD) • Using hardware specialized on parallel and vectorized computations (GPGPU, CELL BroadbandEngine) • These new ideas will be tried out for potential use in sLHC ATLAS (part of PhD project of HåvardGjersdal): • Implement an optimized Kalman filter in the ATLAS reconstruction software • Explore possible applications in a high level trigger.

  12. Financial resources Phase I (2011-2014): • 1.5 MNOK Core • Matching funds for travel, personnel, infrastructure Phase II (2014-2014): In proportion to Norwegian ATLAS authorship • 15 MNOK Core • 30 MNOK Total (travel, project staff, tooling) ATLAS Pixel Upgrade - OMR/UoO

  13. Personnel and infrastructure • Develop existing lab- and clean room facilities • University staff resources: • Senior UoBand UoO faculty • Electronics engineers • Mechanical workshop • Personnel requirements: • EngineerandPh.D student • Post.docandsenior researcher ATLAS Pixel Upgrade - OMR/UoO

  14. National infrastructure for radiation detectors Current NFR infrastructure call: “Advanced scientific equipment” • Joint UoB/UoO application: 10 MNOK ?? • Develop existing facilities for Silicon detector R&D and construction • Clean rooms and lab space • Sensor characterization • Precision mechanics The proposed equipment will be valuable assets for the Norwegian contribution to the ATLAS upgrade ATLAS Pixel Upgrade - OMR/UoO

  15. Conclusions • Well prepared to participate in Phase I and II, both from a technological and scientific point of view • Phase I: starting now • Phase II: needs to be defined by 2011-12 • Critical issues: • Develop local infrastructure • Secure project funding • Retain personnel ATLAS Pixel Upgrade - OMR/UoO

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