The Compressed Baryonic Matter (CBM) experiment is one of the scientific pillars of the Facility
for Anti-proton and Ion Research (FAIR), which is presently under construction adjacent to GSI,
Darmstadt. The Silicon Tracking System (STS) is the core detector of the CBM experiment, located
inside the superconducting dipole magnet. The main task of STS is to reconstruct the tracks and
measure the momentum of charged particles. The STS detector comprises of 896 low-mass detector
modules, based on double-sided silicon microstrip sensors, distributed on 8 tracking stations. The
stations are made from mechanical half units onto which 106 carbon fibre support structures, or
ladders, are mounted which hold the modules.
We discuss the steps of module assembly, combining a silicon sensor, ultra-thin micro cables and
self-triggering front-end electronics into the basic functional unit of the STS. A concept tool has
been designed to study the feasibility of the ladder assembly with mechanical precision of better
than 100 μm. The size of the tool has been chosen to mount five modules onto ladders, fitting the
mSTS demonstrator of the mCBM test experiment at SIS18.