In this paper, we present a complete Data Acquisition System (DAQ) together with the readout mechanisms for the J-PET tomography scanner. In general detector readout chain is constructed out of Front-End Electronics (FEE), measurement devices like Time-to-Digital or Analog-to-Digital Converters (TDCs or ADCs), data collectors and storage. We have developed a system capable for maintaining continuous readout of digitized data without preliminary selection. Such operation mode results in up to 8 Gbps data stream, therefore it is required to introduce a dedicated module for online event building and feature extraction. The Central Controller Module, equipped with Xilinx Zynq SoC and 16 optical transceivers serves as such true real time computing facility. Our solution for the continuous data recording (trigger-less) is a novel approach in such detector systems and assures that most of the information is preserved on the storage for further, high-level processing. Signal discrimination applies an unique method of using LVDS buffers located in the FPGA fabric.
@article{arxiv.1602.05251,
title = {Sampling FEE and Trigger-less DAQ for the J-PET Scanner},
author = {G. Korcyl and D. Alfs and T. Bednarski and P. Białas and E. Czerwiński and K. Dulski and A. Gajos and B. Głowacz and B. Jasińska and D. Kamińska and Ł. Kapłon and P. Kowalski and T. Kozik and W. Krzemień and E. Kubicz and M. Mohammed and Sz. Niedźwiecki and M. Pałka and M. Pawlik-Niedźwiecka and L. Raczyński and Z. Rudy and O. Rundel and N. G. Sharma and M. Silarski and A. Słomski and K. Stoła and A. Strzelecki and A. Wieczorek and W. Wiślicki and B. K. Zgardzińska and M. Zieliński and P. Moskal},
journal= {arXiv preprint arXiv:1602.05251},
year = {2019}
}