High speed digital TDC for D0 vertex reconstruction

Author

Gao, G.S. ; Partridge, Richard

Author_Institution

Dept. of Phys., Brown Univ., Providence, RI, USA

Volume

38

Issue

2

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

286

Lastpage

289

Abstract

A high-speed digital TDC (time-to-digital converter) has been built as part of the Level 0 trigger for the Dφ experiment at Fermilab. The digital TDC is used to make a fast determination of the primary vertex position by timing the arrival times of beam jets detected in the Level 0 counters. The vertex position is then used by the Level 1 trigger to determine the proper sin θ weighting factors for calculating transverse energies. Commercial GaAs integrated circuits are used in the digital TDC to obtain a time resolution of σ_t=226 ps. The current design is limited to measuring a maximum time difference of ≈100 ns, but it could be easily extended by cascading additional counter stages

Keywords

analogue-digital conversion; digital circuits; nuclear electronics; physics computing; trigger circuits; D0 vertex reconstruction; Fermilab; GaAs; Level 0 trigger; Level 1 trigger; arrival times; beam jets; counter stages; high-speed digital TDC; integrated circuits; maximum time difference; primary vertex position; sin &thetas; weighting factors; time resolution; time-to-digital converter; transverse energies; Clocks; Energy resolution; Gallium arsenide; Logic testing; Physics; Position measurement; Prototypes; Radiation detectors; Time measurement; Timing;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.289311

Filename

289311