14-18 October 2013
Amsterdam, Beurs van Berlage
Europe/Amsterdam timezone

An efficient data protocol for encoding preprocessed clusters of CMOS Monolithic Active Pixel Sensors

14 Oct 2013, 15:00
Grote zaal (Amsterdam, Beurs van Berlage)

Grote zaal

Amsterdam, Beurs van Berlage

Poster presentation Event Processing, Simulation and Analysis Poster presentations


Qiyan Li (Goethe University Frankfurt)


CBM aims to measure open charm particles from 15-40 AGeV/c heavy ion collisions by means of secondary vertex reconstruction. The measurement concept includes the use of a free-running DAQ, real time tracking, primary and secondary vertex reconstruction and a tagging of open charm candidates based on secondary vertex information. The related detector challenge will be adressed with an ultra-light and highly granular Micro Vertex Detector (MVD) based on CMOS Monolithic Active Pixel Sensors (MAPS). Performing the real time vertex reconstruction at collision rates of ~1e5 coll./s will introduce a substantial CPU-load to the computing system (FLES) of CBM. To reduce this load, we consider to perform pre-processing steps like cluster finding already in DAQ-instances upstream the FLES. A successful pre-processing concept should be FPGA-compatible. Moreover, it should provide a lossless encoding of the original information as much as the newly computed information on the cluster position and shape without extending the data volume. To fulfill those requirements, we developped a cluster encoding concept which may encode the above mentioned information in a single 32-bit word. This concept is introduced and its validity is discussed based on data from the recent beam test of the MVD-prototype at CERN-SPS.

Primary author

Qiyan Li (Goethe University Frankfurt)


Joachim Stroth (Goethe-University and GSI) Michael Deveaux (University Frankfurt) Samir Amar-Youcef (Uni Frankfurt)

Presentation materials