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High-Resolution Silicon Tracking Station: Concept to Final Design

This document outlines the progress of a high-resolution, fast, and radiation-hard silicon tracking station from conceptual design to final configuration. It covers the design iterations, technological feasibility, performance simulations, and challenging tasks of the tracking station. Key topics include sensor technology, material budget, tracking density, and background rejection. The text provides insights into potential configurations, module designs, and the importance of redundancy in track reconstruction.

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High-Resolution Silicon Tracking Station: Concept to Final Design

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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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