Silicon Tracking System (STS)

Schmidt

STS coordinator:
Hans Rudolf Schmidt

hans-rudolf.schmidt(at)uni-tuebingen.de

Technical Design Report link

STS

Task:

Main detector in the CBM experiment for charged particle measurement including momentum determination.

Detector features:

  • pile-up free track point determination in high-rate collision environment:  105 - 107/s (A+A), up to 109/s (p+A)
  • physics aperture: 2.5° ≤  Θ ≤ 25°, 0.3 m ≤ z ≤ 1.0 m
  • 8 tracking stations, volume 2 m3, area 4 m2
  • 896 detector modules in various lengths
           • 896 double-sided microstrip sensors        
           • radiation tolerance: up to 1014 n cm-2 (1 MeV equivalent)       
           • ~ 1.8 million read-out channels       
           • ~ 16 000 r/o ASICs “STS-XYTER”       
           • ultra-thin r/o cables  (5÷50 cm long)
  • 106 detector ladders with 8 or 10 modules
  • hit spatial resolution of ≈ 25 µm
  • self-triggering front-end electronics
  • time-stamp resolution  ≈ 5 ns
  • power dissipation: ~40 kW  (CO2 cooling)
  • thermal enclosure: sensors at  T = -5° C
  • material : ≈ 0.3 % – 1% X0 per station
  • momentum resolution:  dp/p ≈ 1.8% (p > 1 GeV/c, 1 Tm field)

Integration concept:

STS comcept

Project teams: