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High speed digital TDC for D0 vertex reconstruction

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2 Author(s)
Gaot, G.S. ; Dept. of Phys., Brown Univ., Providence, RI, USA ; Partridge, R.

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 σt=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

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Nuclear Science, IEEE Transactions on  (Volume:38 ,  Issue: 2 )