First level trigger processor for the ZEUS calorimeter

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7247474

Dawson, J W; Talaga, R L; Burr, G W; Laird, R J ^[1]; Smith, W; Lackey, J ^[2]

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1. Argonne National Lab., IL (USA)
2. Wisconsin Univ., Madison, WI (USA). Dept. of Physics

This paper discusses the design of the first level trigger processor for the ZEUS calorimeter. This processor accepts data from the 13,000 photomultipliers of the calorimeter which is topologically divided into 16 regions, and after regional preprocessing, performs logical and numerical operations which cross regional boundaries. Because the crossing period at the HERA collider is 96 ns, it is necessary that first-level trigger decisions be made in pipelined hardware. One microsecond is allowed for the processor to perform the required logical and numerical operations, during which time the data from ten crossings would be resident in the processor while being clocked through the pipelined hardware. The circuitry is implemented in 100K ECL, Advanced CMOS discrete devices, and programmable gate arrays, and operates in a VME environment. All tables and registers are written/read from VME, and all diagnostic codes are executed from VME. Preprocessed data flows into the processor at a rate of 5.2GB/s, and processed data flows from the processor to the Global First-Level Trigger at a rate of 700MB/s. The system allows for subsets of the logic to be configured by software and for various important variables to be histogrammed as they flow through the processor. 2 refs., 3 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7247474
• Report Number(s): ANL-HEP-CP-90-2; CONF-900143--29; ON: DE90007793
• Country of Publication: United States
• Language: English

Related Subjects

440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COMPUTER ARCHITECTURE
DATA PROCESSING
ELECTRONIC CIRCUITS
HERA STORAGE RING
MEASURING INSTRUMENTS
PROCESSING
PULSE CIRCUITS
RADIATION DETECTORS
SHOWER COUNTERS
STORAGE RINGS
TRIGGER CIRCUITS