Erlangen 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 9: Instrumentation II

HK 9.1: Gruppenbericht

Montag, 16. März 2026, 16:15–16:45, PHIL B 302

Status of the CBM Micro Vertex Detector* — •Franz Matejcek for the CBM-MVD collaboration — Goethe-Universität Frankfurt

The Micro Vertex Detector (MVD) is the first downstream detector of the fixed-target CBM Experiment at the future Facility for Antiproton and Ion Research (FAIR). It enables high-precision tracking of low-momentum particles in direct proximity of the target with the first of four stations being placed only 8 cm downstream the interaction point in the target vacuum. ∼ 300 MIMOSIS (TJ-180 nm) CMOS Monolithic Active Pixel Sensors (MAPS) provide > 99% detection efficiency and a 5–6 µm spatial resolution (5 µs frame time), also after irradiation to 5 Mrad and 1 × 10¹⁴ n_eq/cm² (TID+NIEL), fulfilling the requirements and preparing for final sensor submission. Sensors are wire-bonded to thin flex cables and glued onto both sides of Thermal Pyrolytic Graphite (380 µm) carriers, which provide stiff, low-X₀ support with excellent thermal conductivity. Actively cooled aluminum heat sinks outside the acceptance extract the heat.

In this contribution, we present the detector concept, highlights from the CBM-compatible readout validated in mCBM, and results from the final MIMOSIS prototype under CBM-like conditions. A focus will be the challenges associated with vacuum operation, stringent material budget constraints (0.3–0.5% X₀), and double-sided integration as we progress toward station assembly and readiness for first beam in 2028.

*This work has been supported by BMFTR (05H24RF5), HGS-HIRe, HFHF, GSI and Eurizon.

Keywords: CBM; Vertex Detector; Integration