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• W53263384 abstract "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. ULTRA[1], a support experiment for the EUSO mission[2], plans to collect the UV light generated by an Extensive Air Shower (EAS) that is reflected on several surfaces (land, water, snow, etc.). ULTRA is composed by a UV telescope to collect the UV light (UVScope) and a conventional ground array of scintilator detectors (ETscope) responsible for the detection of the EAS. For every event in each ETscope station the energy deposited in the scintilator and the arrival time are estimated. Coincidences among different detectors are then found off-line, using the arrival time at each unit. Since the expected single counting rate at sea level is 180 Hz/m2, the contamination by random coincidences is negligible. The estimation of the direction of the primary cosmic ray is based on the measurement of the time differences between the arrival of the shower front at the different stations and the distance between them. The ULTRA requirement of 8 ◦ for the error on the direction estimation is translated in a precision of 10ns" @default.
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• W53263384 date "2003-07-01" @default.
• W53263384 modified "2023-09-26" @default.
• W53263384 title "A PCI Based Data Acquisition System for Ground Array Detectors With Wireless Synchronization Through GPS" @default.
• W53263384 hasPublicationYear "2003" @default.
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