Continuously live image processor for drift chamber track segment triggering

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/23.775542· OSTI ID:679582

Berenyi, A; Chen, H K; Dao, K ^[1]

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1. Lawrence Berkeley National Lab., CA (United States); and others

The first portion of the BaBar experiment Level 1 Drift Chamber Trigger pipeline is the Track Segment Finder (TSF). Using a novel method incorporating both occupancy and drift-time information, the TSF system continually searches 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 efficiency, deadtime-free operation, a spatial resolution of <0.7 mm and a per-segment 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 were synthesized from a total of 50,000 lines of VHDL. The boards were designed from the top-down with state-of-the-art CAD tools, which included gate-level board simulation. This methodology enabled production of a flawless board with no intermediate prototypes. It was fully tested with basic test patterns and 10{sup 5} simulated physics events.

• Sponsoring Organization: USDOE, Washington, DC (United States); Alexander von Humboldt-Stiftung, Bonn (Germany)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 679582
• Report Number(s): CONF-981110--
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt1 Vol. 46; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
DATA ACQUISITION SYSTEMS
DESIGN
DRIFT CHAMBERS
PEP STORAGE RINGS
READOUT SYSTEMS
TRIGGER CIRCUITS