A PCI Based Data Acquisition System for Ground Array Detectors with Wireless Synchronization through GPS

Details A PCI Based Data Acquisition System for Ground Array Detectors with Wireless Synchronization through GPS A PCI Based Data Acquisition System for Ground Array Detectors with Wireless Synchronization through GPS

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..947a&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

The synchronization of ground based cosmic ray detectors is a recurring problem. Traditional acquisition systems usually drive signal cables from each station of an array of detectors to a central acquisition system. In the context of ULTRA, a support experiment for the EUSO mission, a distributed wireless acquisition system based on a PCI board with synchronization through GPS was developed. The System is composed by several units, one per station and timetags each event on each station. The time differences between the several stations are computed offline. Each unit includes a low-cost, commercial GPS receiver (GPSboard), a custom PCI board (LIP-PAD) and a Personal Computer. The PCI board performs the fine time-tagging and also acquires the PMT signals of the ground array detector. PMT signals are shaped, amplified and then digitized by a 10 bits flash ADC with a frequency of 100 MHz. A digital trigger unit allows to implement several online trigger conditions. On trigger, event data is stored on an onboard memory. The board control and data readout is performed using the PCI bus. The overall time accuracy has been estimated to be better than 5ns.

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