Status of the vertex detector program of the CBM experiment at FAIR

TL;DR

The paper reviews the current status of the vertex detector development for the CBM experiment at FAIR, focusing on sensor technology, station prototyping, and detector control systems.

Contribution

It provides an update on sensor development, station prototyping, and the integration of the vertex detector for the CBM experiment at FAIR.

Findings

Development of highly granular Monolithic Active Pixel Sensors.

Prototyping of detector stations with specified spatial and temporal resolutions.

Progress in detector slow control and integration.

Abstract

The Compressed Baryonic Matter Experiment (CBM) is one of the core experiments of the future FAIR facility (Darmstadt/Germany). The fixed-target experiment will explore the phase diagram of strongly interacting matter in the regime of high net baryon densities with numerous rare probes. The Micro Vertex Detector (MVD) will determine the secondary decay vertex of open charm particles with $\sim 50~\rm \mu m$ precision, contribute to the background rejection in dielectron spectroscopy, and help to reconstruct neutral decay products of strange particles by means of missing mass identification. The MVD comprises four stations with 0.3 and $0.5\%~x/X_0$, which are placed between $5$ and $20~\rm cm$ downstream the target and inside vacuum. It will host highly-granular, next-generation Monolithic Active Pixel Sensors, with a spatial precision of $5\rm~\mu m$, a time resolution of $5 ~\rm \mu s$, and a peak rate capability of $\sim 700~\rm kHz/mm^2$. Moreover, a tolerance to $3\cdot10^{13}~\rm n_{eq}/cm^{2}$ and $\gtrsim 3~\rm Mrad$ are required. In this document, we summarize the status of sensor development, station prototyping, and the detector slow control.