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Upgrade of the CMS Tracker for High Luminosity Operation

Upgrade of the CMS Tracker for High Luminosity Operation. OEPG Jahrestagung 2010. Outline. LHC Upgrade to explore Physics Potential Challenges for the CMS Tracker Required Advances in Technology R&D lines followed by HEPHY Radiation Tolerant Sensors Highly Integrated Sensors

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Upgrade of the CMS Tracker for High Luminosity Operation

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  1. Upgrade of the CMS Tracker for High Luminosity Operation Erik Huemer (HEPHY Vienna) OEPG Jahrestagung 2010

  2. Outline • LHC Upgrade to explore Physics Potential • Challenges for the CMS Tracker • Required Advances in Technology R&D lines followed by HEPHY • Radiation Tolerant Sensors • Highly Integrated Sensors • pt Track-Trigger Modules • Summary Erik Huemer (HEPHY Vienna)

  3. LHC Upgrade toexplorePhysics Potential • Operation until 2020 • Design luminosity: L = 1034 cm-2 s-1 • Continuephysicsprogramm • Increase in luminosity • ADVANTAGE: morestatistics • Also disadvantages 2020 2014 2016 2012 2018 2010 Erik Huemer (HEPHY Vienna)

  4. LHC Upgrade toexplorePhysics Potential • The CMS tracker Erik Huemer (HEPHY Vienna)

  5. LHC Upgrade toexplorePhysics Potential • Track densities at different interaction rates • Disadvantages: • Higher particle background • Higher radiation level • Higher track density 1032 1033 1035 1034 Erik Huemer (HEPHY Vienna)

  6. Challenges for the Tracker • Increase of radiation level • Higher granularity to resolve dense packing of tracks • Tracker needs to provide input to the trigger: • Track-Trigger on pt to enable selection of interesting events • Amount of material in the tracker has to be minimized: • Interactions in the primary vertex • NOT with tracker material Erik Huemer (HEPHY Vienna)

  7. Three R&D Lines • R&D linesfollowedby HEPHY • Radiation Tolerant Sensors • HighlyIntergrated Sensors • pT Track-Trigger Modules Erik Huemer (HEPHY Vienna)

  8. 1. Radiation Tolerant Sensors • Important operating parameters which change with irradiation • Full Depletion Voltage (VFD) • Reverse Bias Current (Dark Current) • Charge Collection Efficiency (CCE) • Silicon bulk materials and manufacturing processes • Float Zone (FZ) or Czochralski (CZ/MCZ) silicon • MCZ n-n sensors • FZ n-n sensors • MCZ n-p sensors • FZ n-p sensors • Thicknessofthesubstrate Erik Huemer (HEPHY Vienna)

  9. 2. Highly Integrated Sensors • Now: External pitch-adapter and readout-chips • Future: Integrated pitch-adapter and on-sensor readout-chip • Reduces material • Higher flexibility • Handles granularity Erik Huemer (HEPHY Vienna)

  10. 3. pt Track-Trigger Modules Pass Fail • Fast measurement of momentum (Pt) for trigger decision • Pt through measurement of track curvature • Track curvature through determination of contact angle on the tracker • 2 parallel sensors with some mm space • “Stiff” track with little curvature with high momentum only • Strips hit, only little dislocated • High Pt Upper Sensor ~1mm ~200μm Lower Sensor ~100μm Upper Sensor Lower Sensor Erik Huemer (HEPHY Vienna)

  11. pt Track-Trigger Modules • Prototype @ CERN • Tested at various angles • Collected 1 TB of data • Development analysis framework • Different geometry • Different read-out logic • Former analysis concepts do not work • Highly object oriented (C++, ROOT) • Quick exchange of single analysis parts Erik Huemer (HEPHY Vienna)

  12. Summary • LHC upgrade crucial for future productivity • CMS tracker has to be rebuilt • Three R&D lines • Radiation hard materials under review • Highly integrated sensors • built, tested, partially analysed • pT track-trigger modules • built , tested, will be analysed with new software Erik Huemer (HEPHY Vienna)

  13. Erik Huemer (HEPHY Vienna)

  14. Backup Slides Erik Huemer (HEPHY Vienna)

  15. Luminosity Numberofbunches Amountofparticles in a bunch Frequencyofbunches Size ofinteractionarea Erik Huemer (HEPHY Vienna)

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