Speaker
Description
The Compressed Baryonic Matter (CBM) experiment is an upcoming fixed-target heavy-ion experiment designed to study the Quantum Chromodynamics (QCD) phase diagram at high net baryon densities and moderate temperatures. The Micro Vertex Detector (MVD) is located 5-10 cm downstream of the target and serves as the first detector in the setup. It is designed for precise tracking and vertex reconstruction in the high track density environment close to the interaction point, requiring a low material budget with each layer contributing only 0.3% to 0.5% of the radiation length (x/X₀).
All stations of the MVD will be equipped with CMOS Monolithic Active Pixel Sensors (MAPS), specifically the MIMOSIS sensor, featuring 1024 × 504 pixels with approximately 5 µs time resolution and about 5-6 µm spatial resolution. The MIMOSIS sensors are required to withstand a Total Ionizing Dose (TID) of about 5 MRad and Non-Ionizing Energy Loss (NIEL) fluences up to 7 x 10$^{13}$ n$_{eq}$/cm$^{2}$ per year of CBM operation. Various prototypes have been developed through a joint R&D effort by IPHC Strasbourg, Goethe University Frankfurt and GSI Darmstadt. These prototypes have undergone extensive laboratory testing before and after dedicated beam tests with minimum ionizing particles at several test facilities. Furthermore, comprehensive tests of radiation tolerance and robustness against heavy-ion impacts have been performed.
In this contribution, we summarize the final results of the MIMOSIS prototype R&D phase and present the resulting design highlights for the final CBM MVD sensor.
