Upgrade of the CMS Tracker for High Luminosity Operation
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Transcript of Upgrade of the CMS Tracker for High Luminosity Operation
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09 September 2010
Erik Huemer (HEPHY Vienna)
Upgrade of the CMS Tracker for High Luminosity Operation
OEPG Jahrestagung 2010
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Upgrade of the CMS Tracker for High Luminosity Operation
2Erik Huemer (HEPHY Vienna)09 September 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– pt Track-Trigger Modules
• Summary
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Upgrade of the CMS Tracker for High Luminosity Operation
3Erik Huemer (HEPHY Vienna)
LHC Upgrade to explore Physics Potential
• Operation until 2020– Design luminosity: L = 1034 cm-2 s-1
• Continue physics programm– Increase in luminosity– ADVANTAGE: more statistics– Also disadvantages
09 September 2010
20102012
20142016
20182020
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Upgrade of the CMS Tracker for High Luminosity Operation
4Erik Huemer (HEPHY Vienna)
LHC Upgrade to explore Physics Potential
09 September 2010
• The CMS tracker
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Upgrade of the CMS Tracker for High Luminosity Operation
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• Track densities at different interaction rates
• Disadvantages: – Higher particle background– Higher radiation level– Higher track density
LHC Upgrade to explore Physics Potential
5Erik Huemer (HEPHY Vienna)09 September 2010
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Upgrade of the CMS Tracker for High Luminosity Operation
• 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
Challenges for the Tracker
6Erik Huemer (HEPHY Vienna)09 September 2010
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Upgrade of the CMS Tracker for High Luminosity Operation
7Erik Huemer (HEPHY Vienna)
Three R&D Lines
• R&D lines followed by HEPHY1. Radiation Tolerant Sensors
2. Highly Intergrated Sensors
3. pT Track-Trigger Modules
09 September 2010
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Upgrade of the CMS Tracker for High Luminosity Operation
1. Radiation Tolerant Sensors
8Erik 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- MCZ n-n sensors- FZ n-n sensors- MCZ n-p sensors- FZ n-p sensors- Thickness of the substrate
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Upgrade of the CMS Tracker for High Luminosity Operation
2. Highly Integrated Sensors
9Erik Huemer (HEPHY Vienna)09 September 2010
• Now: External pitch-adapter and readout-chips• Future: Integrated pitch-adapter and on-sensor
readout-chip- Reduces material- Higher flexibility- Handles granularity
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Upgrade of the CMS Tracker for High Luminosity Operation
3. pt Track-Trigger Modules
10Erik Huemer (HEPHY Vienna)09 September 2010
~200μm
Upper Sensor
Lower Sensor
Pass Fail
~100μm
~1mm
• 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
Lower Sensor
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Upgrade of the CMS Tracker for High Luminosity Operation
11Erik Huemer (HEPHY Vienna)
pt Track-Trigger Modules
09 September 2010
• Prototype @ CERN- Tested at various angles- Collected 1 TB of data
• Development analysis framework- Different geometry- Different read-out logicFormer analysis
concepts do not work
- Highly object oriented (C++, ROOT)
Quick exchange of single analysis parts
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Upgrade of the CMS Tracker for High Luminosity Operation
12Erik Huemer (HEPHY Vienna)
Summary
09 September 2010
• 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
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Upgrade of the CMS Tracker for High Luminosity Operation
13Erik Huemer (HEPHY Vienna)09 September 2010
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Upgrade of the CMS Tracker for High Luminosity Operation
14Erik Huemer (HEPHY Vienna)
Backup Slides
09 September 2010
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Upgrade of the CMS Tracker for High Luminosity Operation
15Erik Huemer (HEPHY Vienna)
Luminosity
09 September 2010
L f nN1N2A
Frequency of bunches
Number of bunches Amount of particles in a bunch
Size of interaction area