upgrade of the cms tracker for high luminosity operation
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
09 September 2010
Erik Huemer (HEPHY Vienna)
Upgrade of the CMS Tracker for High Luminosity Operation
OEPG Jahrestagung 2010
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
Upgrade of the CMS Tracker for High Luminosity Operation
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:
3Erik Huemer (HEPHY Vienna)09 September 2010
L f nN1N2A
p qBR
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
Upgrade of the CMS Tracker for High Luminosity Operation
• 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
Challenges for the Tracker
5Erik Huemer (HEPHY Vienna)09 September 2010
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 (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 the substrate
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
Upgrade of the CMS Tracker for High Luminosity Operation
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
Intelligent Track-Trigger Modules
8Erik Huemer (HEPHY Vienna)09 September 2010
~200μm
Upper Sensor
Lower Sensor
Pass Fail
~100μm
~1mm
Upgrade of the CMS Tracker for High Luminosity Operation
9Erik Huemer (HEPHY Vienna)
• 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
09 September 2010
Upgrade of the CMS Tracker for High Luminosity Operation
10Erik Huemer (HEPHY Vienna)
Summary
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
Upgrade of the CMS Tracker for High Luminosity Operation
11Erik Huemer (HEPHY Vienna)09 September 2010