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High-resolution, fast and radiation-hard silicon tracking station

High-resolution, fast and radiation-hard silicon tracking station. STS working group. CBM collaboration meeting March 2005. To do. Status STS. Conceptual design (CDR) First round of simulations (TSR) ITS with 3 pixel planes SIT with 4 equidistant planes, strip technology through out

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High-resolution, fast and radiation-hard silicon tracking station

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  1. High-resolution, fast and radiation-hard silicon tracking station STS working group CBM collaboration meeting March 2005

  2. To do Status STS • Conceptual design (CDR) • First round of simulations (TSR) • ITS with 3 pixel planes • SIT with 4 equidistant planes, strip technology through out • Design iteration (partly in TSR) • Optimize configuration • Include HitProducers in simulation • Physics performance studies for different physics cases • Final design (TDP 2006?!) • Senors/FE chip, module, support+cooling, readout • Technological feasibility (R&D) • Full performance simulation

  3. Facts after 2nd round of simulations Depends strongly on the physics case. Alternative configurations for different observables possible. Beam pipe of 1 cm Ø First 3 stations (ITS) inside the vacuum! Possibly shielded against good beam vacuum by a foil. Fluence above 1016 Is this the last word ? Pixel Strip Only strip sensors for stations 4 to 7 (SIT) if micro2 strips are used close to the beam!

  4. Challenging tasks of the tracking station (I) • Micro vertex reconstruction (main task of the ITS) • Secondary vertex reconstruction better 50mm (z-coordinate) • Extremely high track density D0→K-p+ Both high resolution and a respectively low material budget are needed.

  5. D0→K-p+ Material budget / plane I. Vassiliev

  6. .. those will form a fake open pair If these are not reconstructed .. Challenging tasks of the tracking station (II) • Background rejection in low mass dielectron spectroscopy • Reconstruction of "incomplete" tracks • Needs probably much more redundancy

  7. P. Koczon d-electrons are a huge concern • Yield in 1st station: 5/gold ion passing the (1%) target • 5000 at frame rates of 10 ms and 109 ions/s !?

  8. Possible configuration (B-TeV inspired) • Outer section of plane 3 outside the vacuum! • Highest granularity not needed there • Allows using thin vacuum window • Detectors can be moved in two halfs. • Remove sensors from beam area during focusing • Only two different module geometries • Optional for MAPS or Hybrids

  9. Hybrid-like Material budget Resolution MAPS-like Radiation hardness Read-out speed Generic designs for simulation

  10. MAPS material budget a first assessment by Michael Deveaux • Stacking of sensors due to inactive read-out area • Design VELO (LHCb) inspired 0.29 %

  11. MAPS R&D • Dense program of chip submission in 2005 • MIMOSA 9 → factor 2 lower signal than expected • MIMOSA 10 → MIMOSTAR1 first prototype for STAR IT • MIMOSA 11 → Various sensor geometries for studying aspects of radiation tolerance • MIMOSA 12 → Multiple charge storage on-pixel, aspects of capacitor performance • MIMOSA 13 → Current readout faster, better noise immunity • Transfer of one test station to Frankfurt • Support R&D efforts starting with MIMOSA11 • Aspects of cryogenic operation

  12. Assessment for GIGATRACKER http://na48.web.cern.ch/NA48/NA48-3/groups/gigatracker/ • NA48: CERN-SPSC-2004-029 (K+→p+nn) • Concept (only small area needs to be covered) • High rate: 40 MHz / cm2 • 100 ps time resolution • Fluence 4.5 1014 cm2 (12 Mrad) • 0.13 mm envisaged x/X0 < 0.6%

  13. STS working packages

  14. Physics benchmarks: • Open charm • i.e. 10.000 D0/run • Low-mass dielectrons • S/B < 1/5 • ? Design optimization Mainframe STS group Tracking groups Algorithms Digitizers MAPS HitProducer (Michael) Design Optimization StripHitProducer(Valeri) Final configuration

  15. Towards a Design Proposal

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