STS coordinator: Hans Rudolf Schmidt hans-rudolf.schmidt(at)uni-tuebingen.de

STS technical coordinator: Johann Heuser j.heuser(at)gsi.de

Technical Design Report link

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:

Project teams:

• GSI (Germany)
• Eberhard Karls Universität Tübingen (Germany)
• Goethe Universität (Germany)
• KIT (Germany)
• AGH (Poland)
• JU (Poland)
• WUT (Poland)
• KINR (Ukraine)
• KEK (Japan) - associate member