The ARGO-YBJ DAQ system

Details The ARGO-YBJ DAQ system The ARGO-YBJ DAQ system

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2887a&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The ARGO-YBJ experiment is presently under construction at the Yangbaijing High Altitude Cosmic Ray Laboratory (4300 m a.s.l), 90 km North to Lhasa (Tibet, People's Republic of China). ARGO will study foundamental issues in cosmic ray and astroparticle physics by detecting small size air showers. The detector covers 74 × 78 m2 with single layer Resistive Plate Counters (RPCs), surrounded by a partially instrumented guard ring. The ARGO Level-1 Data Acquisition System is designed around custom protocols and hardware read-out controllers developed to achieve high data transfer rate and event building capability without software overhead. In this paper we describe the architecture of the system and the hardware developed in the Level 1 environment to acquire the detector's data. 1 The ARGO-YBJ Read-Out system The building blocks of the ARGO detector (ARGO-YBJ Coll. (1996)) are single-gap RPCs, each with 80 read-out strips 6 cm wide and 62 cm long. Each strip is equipped with a front-end amplifier and discriminator mounted on the chamber edge on a Front-End card. The 8-fold modularity of this card defines a logical partition of the chamber called PAD. The detector is clustered in 6 × 2-chamber units with modular read-out and trigger electronics housed in Local Stations. In each Cluster, the 960 pertaining strips are sampled with a time resolution of ˜ 1 ns by digital, multi-hit TDCs. For each PAD, a fast-or signal is also produced. The entire detector comprises 154 Clusters. PADs are the "timing pixel" of the detector and the trigger logic selects the events on the basis of their multiplicity and distribution in time in the Clusters. The trigger signal acts as a common stop for all the digital multi-hit TDCs reading the detector's strips in the Local Stations. In each Cluster, the Local Station assembles a Data Frame containing an incrementing event number, the

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