DCT trigger for a detection of very inclined showers in the Pierre Auger surface detector Engineering Array in the new High-Resolution Front-End based on the Cyclone V FPGA

Abstract

Abstract-The paper presents the first results from the trigger based on the Discrete Cosine Transform (DCT) operating in the new Front-End Boards with Cyclone V FPGA deployed in 8 test surface detectors in the Pierre Auger Engineering Array.The patterns of the Analog-to-Digial Converter (ADC) traces generated by very inclined showers were obtained from the Auger database and from the CORSIKA simulation package supported next by OffLine reconstruction Auger platform which gives a predicted digitized signal profiles. Simulations for many variants of the initial angle of shower, initialization depth in the atmosphere, type of particle and its initial energy gave a boundary of the DCT coefficients used next for the on-line pattern recognition in the FPGA.Preliminary results have proven a right approach. We registered several showers triggered by the DCT for 120 MSps and 160 MSps.