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The SLHC and the Challenges of the CMS Upgrade

The SLHC and the Challenges of the CMS Upgrade. William Ferguson First year seminar March 2 nd 2010. Introduction. Increased luminosity at the SLHC will expose detectors to much greater particle fluences Project is working on the necessary upgrade to CMS for the SLHC

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The SLHC and the Challenges of the CMS Upgrade

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  1. The SLHC and the Challenges of the CMS Upgrade William Ferguson First year seminar March 2nd 2010

  2. Introduction Increased luminosity at the SLHC will expose detectors to much greater particle fluences Project is working on the necessary upgrade to CMS for the SLHC Work is needed on tracker and trigger systems in particular 2

  3. Outline • CMS detector • Super Large Hadron Collider • Tracker - Present tracker - Tracker upgrade • Trigger - Present trigger - Trigger upgrade • Research plan

  4. CMS • Compact Muon Solenoid • General purpose detector • Interaction point 5, north side of LHC ring • Aims are to • Study physics at TeV scale • Search for Higgs • New physics beyond SM • Measures particle energies and trajectories

  5. CMS • Composed of concentric cylindrical layers with endcaps either end

  6. SLHC • SLHC – Super Large Hadron Collider • An order of magnitude increase in beam luminosity to ~1035 cm-2s-1 • Principle aim - MORE STATISTICS - should improve accuracy of SM parameters - extend discovery in high mass regions - improve sensitivity to rare processes

  7. SLHC But – there is a downside... • Increasing luminosity also increases • Detector occupancy • Trigger rates • Radiation damage • To benefit, detector performance must remain • Two notable areas for development are - TRACKER - TRIGGER

  8. Tracker • Silicon detector system – measures trajectories • Composed of inner pixel layer, and outer microstrip layer • Endcaps complete the system and provide coverage up to |η| < 2.5 • Analogue signals are transferred to off-detector front end drivers (FEDs) • ADC is done off-detector to reduce electronics and cooling requirements

  9. Tracker Upgrade Large luminosity increase introduces problems • Radiation damage • High fluences of energetic particles damage the silicon lattice • Over occupancy • Higher granularity required → more electronics, more material, more unwanted interactions • Power and cooling systems 9

  10. Trigger • LHC bunch crossing rate is 40 MHz gives 109 interactions per second • Only 102 can be recorded → Trigger needs rejection factor of ~107 • Triggering is done in 2 levels… • Level 1 Trigger (L1T) • Higher Level Trigger (HLT)

  11. Trigger • L1T • Reduces data rate from 109 → 105 Hz • Uses calorimeter and muon system data only • Trigger logic is contained off-detector in ASICs, FPGAs, PLDs • HLT • Reduces data rate from 105 → 102 Hz • Uses data from all sub detectors

  12. Trigger Upgrade • Large luminosity of SLHC • Increases background • Reduces efficiency • L1T must maintain 105 Hz rate • Stricter pT and ET cuts are not acceptable • Put low mass discoveries out of reach • Reduces efficiency • Proposal is to use TRACKER data in the L1T

  13. Trigger Upgrade Issues On detector data reduction required More power required → more material Impossible to read out full tracker data quickly enough - Identify just high pT tracks - Stacked tracking 13

  14. Research plan • Project is study of electronics, detectors and systems for the CMS upgrade - Studies of DAQ systems for new Si strip detector - inc beam tests and data analysis - Testing, analysis and development of new readout ASIC - Module development for trigger and outer tracker - inc simulations and data analysis 14

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