Abstract
The Compressed Baryonic Matter (CBM) experiment at the Facility for Anti-Proton and Ion Research (FAIR) will explore the phase diagram of strongly interacting matter at highest net baryon densities and moderate temperatures. The CBM physics program will be started with beams delivered by the SIS 100 synchrotron, providing energies from 2 to 11 GeV/nucleon for heavy nuclei, up to 14 GeV/nucleon for light nuclei, and 29 GeV for protons. The highest net baryon densities will be explored with ion beams up to 45 GeV/nucleon energy delivered by SIS 300 in the next stage of FAIR. Collision rates up to 107 per second are required to produce very rare probes with unprecedented statistics in this energy range. Their signatures are complex. These conditions call for detector systems designed to meet the extreme requirements in terms of rate capability, momentum and spatial resolution, and a novel DAQ and trigger concept which is not limited by latency but by throughput. The article discusses the development status of the CBM sub-systems for charged particle tracking, vertex detection, electron/muon identification, hadron/time-of-flight measurement, electromagnetic and zero-degree calorimetry, in terms of prototypes and expected physics performance. The concept and development status of CBM’s central detector, the Silicon Tracking System STS are presented in somewhat more detail.
Highlights
EPJ Web of Conferences data that will be sent to a high speed data acquisition system for on-line event reconstruction in a powerful computing farm
As event classes can only be identified after the full reconstruction of the detector data leading to the events as such, the Compressed Baryonic Matter (CBM) experiment has no hardware detector triggers but builds entirely on software triggers as an output of the on-line event analysis
The detector will consist of monolithic active pixel sensors (MAPS) arranged on four stations in the target vacuum chamber [6]
Summary
EPJ Web of Conferences data that will be sent to a high speed data acquisition system for on-line event reconstruction in a powerful computing farm. The on-line computing will cope with the high collision and data rates through parallelization of the analyses, with suitable algorithms running on many-core processing units. An example of the challenge is CBM’s central detector for the reconstruction of charged particles, the Silicon Tracking System. On-line event reconstruction requires their pile-up free read-out and presentation to a computing system that can process the data at those rates
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