학술논문
Cluster counting for E799/E832 at Fermilab
Document Type
Conference
Author
Source
IEEE Conference on Nuclear Science Symposium and Medical Imaging Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE. :338-340 vol.1 1992
Subject
Language
Abstract
A high-speed algorithm for counting the number of geographically contiguous above-threshold hits (clusters) in a CsI array is presented. The algorithm processes an N*N array in O(N) time, using O(N) parallel logic elements with only four inputs each. For the 40*40 (equivalent) array in the E799/E832 experiments at Fermilab, this cluster count information will be made available to the Level 2 trigger in less than 2 mu s. This approach is based on simple pattern recognition of local concavity and convexity in the signals from adjacent blocks in the CsI array. This approach is a two-dimensional analog to the Huffman-Clowes edge-labeling scheme developed for artificial intelligence and scene interpretation. The status of the implementation of this algorithm using Xilinx XC3042 field programmable gate arrays is presented.ETX