The design and performance of the ZEUS Central Tracking Detector z-by-timing system
/ Authors
D. Bailey, R. C. Carter, B. Foster, N. Harnew, G. Heath, M. Jeffs, T. Khatri, M. Lancaster, J. Lane, I. Mcarthur
and 18 more authors
J. Mcfall, R. Milborrow, C. Morgado, M. Morrissey, J. Nash, G. Nixon, D. A. Phillips, M. Postranecky, S. Quinton, P. Shield, S. Topp-Jorgensen, G. Westlake, D. White, F. F. W. .. U. O. Bristol, R. Laboratory, U. Oxford, University College, London
/ Abstract
Abstract 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.
Journal: Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment