Continuously live image processor for drift chamber track segment triggering

Citation
A. Berenyi et al., Continuously live image processor for drift chamber track segment triggering, IEEE NUCL S, 46(3), 1999, pp. 348-353
Citations number
2
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
3
Year of publication
1999
Part
1
Pages
348 - 353
Database
ISI
SICI code
0018-9499(199906)46:3<348:CLIPFD>2.0.ZU;2-W
Abstract
The first portion of the BABAR experiment Level 1 Drift Chamber Trigger pip eline is the Track Segment Finder (TSF). Using a-novel-method incorporating both occupancy and drift-time information, the TSF system continually sear ches for segments in the supercells of the full 7104-wire Drift Chamber hit image at 3.7 MHz. The TSF was constructed to operate in a potentially high beam-background environment while achieving high segment-finding efficienc y, deadtime-free operation, a spatial resolution of < 0.7 mm and a per-segm ent event time resolution of < 70 ns. The TSF system consists of 24 hardware-identical TSF modules. These,are the most complex modules in the BABAR trigger. On each module, fully parallel segment finding proceeds in 20 pipeline steps. Each module consists of a 9U algorithm board and a 6U interface board. The 9U printed circuit board has 10 layers and contains 0.9 million gates implemented in 25 FPGAs, which we re-synthesized from a total of 50,000 lines of VHDL, The boards were design ed from the top-down with state-of-the-art CAD tools, which included gate-l evel board simulation. This methodology enabled production bf-a flawless bo ard with no intermediate prototypes. It was fully tested with basic test pa tterns and 10(5) simulated physics events.