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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. Why and What? Challenges for the CMS Tracker Possible Solutions - Radiation Hard Sensor Materials - Highly Integrated Sensors - Intelligent Track-Trigger Modules Summary.

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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 • Why and What? • Challenges for the CMS Tracker • Possible Solutions - Radiation Hard Sensor Materials - Highly Integrated Sensors - Intelligent Track-Trigger Modules • Summary Erik Huemer (HEPHY Vienna)

  3. sLHC Upgrade: Why and What? Current LHC design specifications: • Center-of-mass energy ECM = 14 TeV  Momentum per particle: p = 7 TeV/c • Luminosity L = 1034 cm-2s-1 ECM is limited by: Luminosity is limited by: Erik Huemer (HEPHY Vienna)

  4. sLHC: A Luminosity Upgrade Increases number of interactions per time! • Advantage: • More statistics • Disadvantages: • Higher particle background • Higher radiation level • Higher occupancy Erik Huemer (HEPHY Vienna)

  5. Challenges for the Tracker • Tracker needs to provide input to the trigger: Track-Trigger on pt • Increase of radiation level • Higher granularity to resolve dense packing of tracks All while reducing the material budget! Very challenging as: • MB of current tracker exceeds expectations • Now more channels and intelligent modules • Needs more power  needs more cooling Erik Huemer (HEPHY Vienna)

  6. Radiation Hard Sensor Materials 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 • N or P doped silicon • N or P doped strips • Thickness of thesubstrate Erik Huemer (HEPHY Vienna)

  7. Highly Integrated Sensors • Direct connection between sensor and readout • Now: External pitch-adapter made of glass • Future: Integrated pitch-adapter and • readout-Chip • Less material • Easier to build module • Higher density of readout channels Erik Huemer (HEPHY Vienna)

  8. Intelligent Track-Trigger Modules Pass Fail • Fast measurement of momentum (Pt) for trigger decision • Pt through measurement of track curvature • Track curvature through determination of “dislocation” of the track after some mm • 2 parallel sensors with some mm space • “Stiff” track with little curvature with high momentum only • Strips hit, only little dislocated • High Pt • Module needs integrated “intelligence” for pattern-determination over 2 sensors Upper Sensor ~1mm ~200μm Lower Sensor ~100μm Erik Huemer (HEPHY Vienna)

  9. Intelligent Track-Trigger Modules • Actual data was taken • Results are promising Development analysis framework • Different geometry of sensor • Different read-out logic • Former analysis concept fails • Highly object oriented (C++, ROOT) • Quick exchange of single analysis parts • Proof of concept! Erik Huemer (HEPHY Vienna)

  10. Summary • LHC upgrade crucial for future productivity • Challenges are dealt with • - Radiation hard materials under review • - Integrated sensor prototypes • built, tested, partially analysed • - Intelligent modules for early detection • built , tested, will be analysed Erik Huemer (HEPHY Vienna)

  11. Erik Huemer (HEPHY Vienna)

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