Timestamp Reliability of the Schenberg Gravitational Wave Detector Data Acquisition System

The Schenberg gravitational wave (GW) detector has been under development for the past few years. A scientific run is planned for the near future. The main technique used to confirm a GW is the search for time coincident events between multiple detectors. Therefore, a reliable timestamp is essential for events found in data from each detector. In the particular case of the Schenberg detector, we are planning a low latency analysis, which requires that no data sample be lost during either data acquisition (DAQ) or transmission, and that time correction be done online. The aim is to provide reliable data where each sample carries its own timestamp information. GW event candidates are pointed out after a dedicated analysis and their time of occurrence are determined by these samples. We present here the DAQ solution developed for the Schenberg detector. It is easy to implement this solution using equipment commonly found in most laboratories. No specific equipment using precision time protocol or other protocol was needed to synchronize the sampling. In addition, no transmission time is needed to be explicitly known. The timing precision is limited only by the chosen sampling frequency, which fulfills the data analysis needs.