SDC data acquisition system-requirements and proposed implementation details

Abstract

Summary form only. The trigger systems proposed for the Solenoidal Collaboration Detector (SDC) at the Superconducting Super Collider (SSC) should reduce physics event rates resulting from 63-MHz beam crossings from 10/sup 8/ interactions per second to between 10/sup 3/ and 10/sup 4/ events per second. Estimated event sizes range from one-half to 1 MByte, resulting in typical and maximum data acquisition system required throughput rates of 1 and 10 Gb/s, respectively. Approximately 300 crates and 400 data sources are required to house and transmit event data from the proposed eight front-end and two trigger systems to the data acquisition system's event builder. In order to achieve the very high throughput requirements, new truly parallel techniques using commercial switching networks are proposed for event building and event data flow control. Some estimates of online processing requirements have been as high as 10/sup 6/ VAX-780 equivalents.<>