The DZERO level 3 data acquisition system

Rice University, Houston, Texas, United States
IEEE Transactions on Nuclear Science (Impact Factor: 1.28). 07/2004; 51(3):445 - 450. DOI: 10.1109/TNS.2004.828785
Source: IEEE Xplore


The DZERO experiment began RunII datataking operation at Fermilab in spring 2001. The physics program of the experiment requires the Level 3 data acquisition (DAQ) system system to handle average event sizes of 250 kilobytes at a rate of 1 kHz. The system routes and transfers event fragments of approximately 1-20 kilobytes from 63 VME crate sources to any of approximately 100 processing nodes. It is built upon a Cisco 6509 Ethernet switch, standard PCs, and commodity VME single board computers (SBCs). The system has been in full operation since spring 2002.

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    • "A schematic view the components is shown in Fig. 1 and the operation and data flow is shown in Fig. 2. Fig. 1. The physical network configuration of the L3DAQ system A detailed description of the system can be found in Ref. [1], here we will describe recent updates, the current performance of the system and some future upgrades. "
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    ABSTRACT: The D Level 3 data acquisition system for Run II of the Tevatron has been reliably operating since May 2002. Designed to handle average event sizes of 250 kilobytes at a rate of 1 kHz, the system has been upgraded to be able to process more events, doubling its typical output rate from 50 Hz to 100 Hz, while coping with higher event sizes at the beginning of high luminosity collider stores. The system routes and transfers event fragments from 63 VME crates to any of approximately 320 processing nodes. The addition of more farm nodes, the performance of the components, and the running experience are described here.
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