Data Acquisition System of the Virgo Gravitational

Virgo is an experiment aiming at the detection of grav- itational waves emitted by astrophysical sources. Its detector, based on a 3 km arms interferometer, is a complex setup which requires several digital control loops running up to 10 kHz, an accurate and reliable central timing system and an efficient data acquisi- tion, all of them being distributed over 3 km. We overview here the main hardware and software components developed for the data acquisition system (DAQ) and its current architecture. Then, we briefly discuss its connections with interferometer's controls, espe- cially through the automation of the interferometer's startup pro- cedure. Then, we describe the tools used to monitor the DAQ and the performances we measured with them. Finally, are described also the tools developed for the online detector monitoring, manda- tory complement of the DAQ for the commissioning of the Virgo detector.