Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1997-07-18
Nucl.Instrum.Meth. A396 (1997) 320-349
Physics
High Energy Physics
High Energy Physics - Experiment
49 pages, 32 figures. Accepted for publication in NIM-A
Scientific paper
10.1016/S0168-9002(97)00790-0
The ZEUS Central Tracking Detector utilizes a time difference measurement to provide a fast determination of the z-coordinate of each hit. The z-by-timing measurement is achieved by using a Time-to-Amplitude Converter which has an intrinsic timing resolution of 36 ps, has pipelined readout, and has a multihit capability of 48 ns. In order to maintain the required sub-nanosecond timing accuracy, the technique incorporates an automated self-calibration system. The readout of the z-by-timing data utilizes a fully customized timing control system which runs synchronously with the HERA beam-crossing clock, and a data acquisition system implemented on a network of Transputers. Three dimensional space-points provided by the z-by-timing system are used as input to all three levels of the ZEUS trigger and for offline track reconstruction. The average z-resolution is determined to be 4.4 cm for multi-track events from positron-proton collisions in the ZEUS detector.
Bailey D. S.
Carter Ralf C.
Foster Brendan
Harnew N.
Heath G. P.
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