First-level trigger processor for the ZEUS calorimeter

Journal Article · Sat Dec 01 04:00:00 EST 1990 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/TNS.1990.574214· OSTI ID:5687714

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

---

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

The design of the first-level trigger processor for the Zeus calorimeter is discussed. 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 that 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 emitter-coupled logic (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 5.2 Gbyte/s, and processed data flows from the processor to the global first-level trigger at a rate of 70 Mbyte/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.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5687714
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA) Vol. 37:6; ISSN 0018-9499; ISSN IETNA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DESIGN
DIAGNOSTIC TECHNIQUES
ELECTRONIC CIRCUITS
HERA STORAGE RING
LOGIC CIRCUITS
MEASURING INSTRUMENTS
PHOTOMULTIPLIERS
PHOTOTUBES
PULSE CIRCUITS
RADIATION DETECTORS
SHOWER COUNTERS
STORAGE RINGS
TRIGGER CIRCUITS