The Micro Vertex detector is designed under rigorous constraints shaped by the need for high precision vertexing and tracking of particles with small laboratory momenta in the CBM energy regime. A central design objective is the reduction of the material budget to a limit of 0.3 – 0.5 % x/X0 for each station aiming to minimize multiple scattering. To achieve this the detector is placed inside the target vacuum chamber to omit additional material introduced by a vacuum window. The detector must withstand intense radiation caused by 

• high track densities (above 3/mm²),

•  presence of δ electrons present in heavy-ion collisions,

•  elastically scattered protons in proton beam experiments.

This environment makes radiation hardness a critical requirement for the choice of materials as well as for the sensing element (the MIMOSIS sensor). In order to maintain high detection efficiency and suppress fake hits the sensors demand stable sub-zero operation, consequently thermal management poses major technical challenges, addressed by:

• mounting sensors on thin, highly heat-conductive Thermal Pyrolytic Graphite carriers;

• moving active cooling to the periphery to maintain a low material budget.

Additional challenges arise from the magnetic field and vacuum conditions which although not detrimental to the sensors, limit the range of compatible materials and necessitate careful system design.