CBM position with respect to Russian war on Ukraine

  • As sign of solidarity with Ukraine and Ukrainian people and to protest against the cruel Russian aggression, the violation of human rights and international law, CBM supports the drastic sanctions imposed by EU and western countries.
  • As part of the sanctions, all scientific exchanges with Russian institutions have been suspended, our colleagues from Russian institutions are prohibited to co-work with us at this moment.
  • The science case of CBM @ SIS100 is unaffected by the political situation and is unique world-wide.
  • The completion of FAIR and CBM without further Russian contribution is currently being evaluated, a delay of ‘start of operation’ of the facility is anticipated.
  • To mitigate the serious consequences of further delays, a staged implementation of the CBM experiment with the option for first physics measurements in 2026 utilizing beams of the SIS18 accelerator is considered.

Dear CBM colleagues,

in order to document our efforts towards the realization of the CBM experiment, we plan to publish a CBM Progress Report 2021. Like in the past, the contributions might have a length of 1-2 pages, and should be send to the corresponding reviewers (list see below). Please use the usual template, and submit your contribution until March 31, 2022. A short summary on each subproject in the beginning of the chapter written by the reviewer is welcomed. Our goal is to publish the report end of March.

Reviewers: C. Blume, S. Chattopadhyay, J. de Cuveland, I. Deppner, D. Emschermann, V. Friese, J. Heuser, C. Höhne, M. Kis, C. Müntz, I. Selyuzhenkov, P. Senger, C. Sturm, A. Toia

Silicon Tracking System (STS)


STS coordinator:
Hans Rudolf Schmidt



STS technical coordinator:
Johann Heuser


Technical Design Report link



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: