Author/Authors :
Abt، نويسنده , , I. and Perschke، نويسنده , , T. and Schaller، نويسنده , , S. and Masciocchi، نويسنده , , S. and Bauer، نويسنده , , C. and Brنuer، نويسنده , , M. and Hofmann، نويسنده , , W. and Jagla، نويسنده , , T. and Knِpfle، نويسنده , , K.T. and Pleier، نويسنده , , M.A. and Reeves، نويسنده , , K. and Schmelling، نويسنده , , M. and Schwingenheuer، نويسنده , , B. and Sciacca، نويسنده , , F.، نويسنده ,
Abstract :
The HERA-B Vertex Detector System (VDS) is a Roman Pot system integrated into the proton ring of the HERA accelerator at DESY and serves as an independent part of the tracking system of the HERA-B forward spectrometer. The performance of the VDS meets the design specification. It is based on double-sided silicon micro-strip detectors which are operated as close as 1 cm to the beam and are thus exposed to extremely high and inhomogeneous radiation levels. At the design luminosity the peak irradiation is around 3×1014 minimum ionizing particles per cm2 per year. Test measurements have shown adequate radiation tolerance on the required time scale of 1 year. New long-term studies presented here indicate that on periods longer than 1 year charge collection efficiencies might drop.
Keywords :
HERA-B , Vertex detector , Vertex resolution , Roman pot , Silicon strip detector , Radiation damage
