G. Kramberger
University of Hamburg
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Featured researches published by G. Kramberger.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2007
A. Polini; I. Brock; S. Goers; A. Kappes; U. F. Katz; E. Hilger; J. Rautenberg; A. Weber; A. Mastroberardino; E. Tassi; V. Adler; Lat Bauerdick; I. Bloch; T. Haas; U. Klein; U. Koetz; G. Kramberger; E. Lobodzinska; Rainer Mankel; J.S.T. Ng; D. Notz; M.C. Petrucci; B. Surrow; G. Watt; C. Youngman; W. D. Zeuner; C. Coldewey; R. Heller; E. Gallo; T. Carli
Abstract In order to extend the tracking acceptance, to improve the primary and secondary vertex reconstruction and thus enhancing the tagging capabilities for short lived particles, the ZEUS experiment at the HERA Collider at DESY installed a silicon strip vertex detector. The barrel part of the detector is a 63xa0cm long cylinder with silicon sensors arranged around an elliptical beampipe. The forward part consists of four circular shaped disks. In total just over 200k channels are read out using 2.9 m 2 of silicon. In this report a detailed overview of the design and construction of the detector is given and the performance of the completed system is reviewed.
ieee nuclear science symposium | 2003
I. Bloch; E. Borsato; R. Carlin; F. Dal Corso; D. Dannheim; B. Kahle; K. Klimek; U. Kötz; G. Kramberger; A. Longhin; I. Melzer-Pellmann; M. Milite
A radiation monitoring and automatic beam-dump system has been installed in the interaction region of the ZEUS experiment during the last upgrade of the electron/positron-proton collider HERA. It is used to prevent the ZEUS Silicon Microvertex Detector (MVD) from beam-background induced radiation damage during HERA operation. The dose rate measurement is based on the readout of radiation induced signal currents from silicon PIN diodes. A precise temperature measurement allows to correct for temperature induced changes in the offset leakage current of the diodes. The online dose rate measurement is complemented by a system of radiation field effect transistors (RadFETs), which are sensitive to accumulated surface damage from ionizing radiation. The integrated dose is obtained from the change in the threshold voltage of the RadFET devices. In addition, thermo-luminescense dosimeters (TLDs) measuring the integrated dose of photon and neutron irradiation are used to control and calibrate the online dose measurements. The radiation monitoring system has been designed to measure the dose on a time scale from milliseconds up to the lifetime of the experiment of several years. It provides online information on the actual level of background radiation to both the HERA and ZEUS shift crews and triggers an automatic dump of the lepton beam in case of excessively high instantaneous dose rates.
