The ZEUS microvertex detector

For the HERA luminosity upgrade in the year 2000, the ZEUS experiment is pr eparing a high-precision vertex detector using single-sided silicon microst rip detectors with capacitive charge division. The readout pitch of the det ectors is 120 mu m with five intermediate strips. The paper reviews the des ign of the microvertex detector consisting of a central part with three dou ble layers and four wheels in the forward region. Results on electrical mea surements before and after irradiation on the detectors and on the test str uctures designed for quality-control measurements are presented. For a numb er of prototype detectors mounted to the prototype readout electronics (HEL IX-128) the pulse height distribution and the position resolution has been measured in a test beam using 6 GeV electrons. The expected position resolu tion of about 7.5 mu m at normal incidence has been achieved. (C) 2000 Else vier Science B.V. All rights reserved.