A massively parallel track-finding system for the LEVEL 2 trigger in the CLAS detector at CEBAF
- Christopher Newport Univ., Newport News, VA (United States)
- 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
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43 PARTICLE ACCELERATORS
CEBAF ACCELERATOR
DRIFT CHAMBERS
TRIGGER CIRCUITS
DESIGN
CHERENKOV COUNTERS
DATA ACQUISITION SYSTEMS
MAGNETIC SPECTROMETERS
MICROPROCESSORS
PARTICLE TRACKS
PROGRAMMING
SCINTILLATION COUNTERS
SHOWER COUNTERS
ACCELERATORS
COMPUTERS
ELECTRONIC CIRCUITS
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MULTIWIRE PROPORTIONAL CHAMBERS
PROPORTIONAL COUNTERS
PULSE CIRCUITS
RADIATION DETECTORS
SPECTROMETERS
440104* - Radiation Instrumentation- High Energy Physics Instrumentation
430303 - Particle Accelerators- Experimental Facilities & Equipment