1. 09 September 2010 Erik Huemer (HEPHY Vienna) Upgrade of the CMS Tracker for High Luminosity Operation OEPG Jahrestagung 2010

2. Upgrade of the CMS Tracker for High Luminosity Operation 2Erik Huemer (HEPHY Vienna)09 September 2010 Outline Why and What? Challenges for the CMS Tracker Possible Solutions -Radiation Hard Sensor Materials -Highly Integrated Sensors -Intelligent Track-Trigger Modules Summary

3. Upgrade of the CMS Tracker for High Luminosity Operation sLHC Upgrade: Why and What? Current LHC design specifications: Center-of-mass energy E CM = 14 TeV  Momentum per particle: p = 7 TeV/c Luminosity L = 10 34 cm -2 s -1 E CM is limited by: Luminosity is limited by: 3Erik Huemer (HEPHY Vienna)09 September 2010

4. Upgrade of the CMS Tracker for High Luminosity Operation Increases number of interactions per time! Advantage: –More statistics Disadvantages: –Higher particle background –Higher radiation level –Higher occupancy sLHC: A Luminosity Upgrade 4Erik Huemer (HEPHY Vienna)09 September 2010

5. Upgrade of the CMS Tracker for High Luminosity Operation Tracker needs to provide input to the trigger: Track-Trigger on p t 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 Challenges for the Tracker 5Erik Huemer (HEPHY Vienna)09 September 2010

6. Upgrade of the CMS Tracker for High Luminosity Operation Radiation Hard Sensor Materials 6Erik Huemer (HEPHY Vienna)09 September 2010 Important operating parameters which change with irradiation Full Depletion Voltage (V FD ) 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 the substrate

7. Upgrade of the CMS Tracker for High Luminosity Operation Highly Integrated Sensors 7Erik Huemer (HEPHY Vienna)09 September 2010 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

8. Upgrade of the CMS Tracker for High Luminosity Operation Fast measurement of momentum (P t ) for trigger decision P t 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 P t Module needs integrated “intelligence” for pattern-determination over 2 sensors Intelligent Track-Trigger Modules 8Erik Huemer (HEPHY Vienna)09 September 2010 ~200 μm Upper Sensor Lower Sensor Pass Fail ~100 μm ~1mm

9. Upgrade of the CMS Tracker for High Luminosity Operation 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! Intelligent Track-Trigger Modules 9Erik Huemer (HEPHY Vienna)09 September 2010

10. Upgrade of the CMS Tracker for High Luminosity Operation Summary 10Erik Huemer (HEPHY Vienna)09 September 2010 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

11. Upgrade of the CMS Tracker for High Luminosity Operation 11Erik Huemer (HEPHY Vienna)09 September 2010