A binary link tracker for the BaBar Level 1 trigger system

Citation
A. Berenyi et al., A binary link tracker for the BaBar Level 1 trigger system, IEEE NUCL S, 46(4), 1999, pp. 928-932
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Nuclear Emgineering
Journal title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
ISSN journal
0018-9499 → ACNP
Volume
46
Issue
4
Year of publication
1999
Part
1
Pages
928 - 932
Database
ISI
SICI code
0018-9499(199908)46:4<928:ABLTFT>2.0.ZU;2-V
Abstract
The BABAR detector at PEP-II will operate in a high-luminosity e(+)e(-) col lider environment near the Y(4S) resonance with the primary goal of studyin g CP violation in the B meson system. In this environment, typical physics events of interest involve multiple charged particles. These events are ide ntified by counting these tracks in a fast first level (Level 1) trigger sy stem, by reconstructing the tracks in "real time." For this purpose, a Bina ry Link Tracker Module (BLTM) was designed and fabricated for the BABAR Lev el 1 Drift Chamber trigger system. The BLTM is responsible for linking trac k segments, constructed by the Track Segment Finder Modules (TSFM), into co mplete tracks. A single BLTM module processes a 360 MBytes/s: stream of seg ment hit data, corresponding to information from the entire Drift chamber, and implements a fast and robust algorithm that tolerates high hit occupanc ies as well as local inefficiencies of the Drift Chamber. The algorithms an d the necessary control logic of the BLTM were implemented in Field Program mable Gate Arrays (FPGAs), using the VHDL hardware description language. Th e finished 9U x 400 nun Euro-format board contains roughly 75,000 gates of programmable logic or about 10,000 lines of VHDL code synthesized into five FPGAs.