skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A massively parallel track-finding system for the LEVEL 2 trigger in the CLAS detector at CEBAF

Conference · · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)
OSTI ID:6595278
; ;  [1];  [2]
  1. Christopher Newport Univ., Newport News, VA (United States)
  2. Continuous Electron Beam Accelerator Facility, Newport News, VA (United States)

The track segment finding subsystem of the LEVEL 2 trigger in the CLAS detector has been designed and prototyped. Track segments will be found in the 35,076 wires of the drift chambers using a massively parallel array of 768 Xilinx XC-4005 FPGA's. These FPGA's are located on daughter cards attached to the front-end boards distributed around the detector. Each chip is responsible for finding tracks passing through a 4 x 6 slice of an axial superlayer, and reports two segment found bits, one for each pair of cells. The algorithm used finds segments even when one or two layers or cells along the track is missing (this number is programmable), while being highly resistant to false segments arising from noise hits. Adjacent chips share data to find tracks crossing cell and board boundaries. For maximum speed, fully combinatorial logic is used inside each chip, with the result that all segments in the detector are found within 150 ns. Segment collection boards gather track segments from each axial superlayer and pass them via a high speed link to the segment linking subsystem in an additional 400 ns for typical events. The Xilinx chips are ram-based and therefore reprogrammable, allowing for future upgrades and algorithm enhancements.

DOE Contract Number:
AC05-84ER40150
OSTI ID:
6595278
Report Number(s):
CONF-930640-; CODEN: IETNAE
Journal Information:
IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Vol. 41:1Pt1; Conference: RT '93: 8th IEEE conference on real-time computer applications in nuclear, particle and plasma physics, Vancouver (Canada), 8-11 Jun 1993; ISSN 0018-9499
Country of Publication:
United States
Language:
English