UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:23
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Conference: Bucharest University Faculty of Physics 2011 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Damage and long time performances studies in silicon detectors


Authors:
Sorina Lazanu (1), Ionel Lazanu (2)


Affiliation:
(1) National Institute for Materials Physics, POBox MG-7, Bucharest-Măgurele, Romania

(2) University of Bucharest, Faculty of Physics, POBox MG-11, Bucharest-Măgurele, Romania


E-mail
E-Mail: ionel.lazanu@g.unibuc.ro


Keywords:
detection, silicon, damage, long time performances


Abstract:
Silicon detectors are used extensively in the present generation of experiments in high energy physics and will be yet an important option for the future. These detectors operate in high and complexes fields of radiation background due to high fluences of hadrons and leptons in the interaction vertex and the main obstacle to long-time operation arises from bulk displacement damage in silicon, which produces primary point defects. During annealing processes, the structural modifications of the semiconductor material produces modifications at the device level increasing the leakage current in the detector, decreasing the Signal/Noise ratio, and increasing the effective carrier concentration (and thus the depletion voltage), which ultimately imposes the operational voltage of the device beyond the breakdown voltage. A great problem in these studies is represented by the difficulty to reproduce the realistic conditions in the HEP facilities, and thus most of the investigations are done for simulated conditions. Recently, results on the behavior of silicon detectors after eight and ten years of operation in proton-antiproton interaction conditions at Tevatron were made available and a confrontation between experiment and predictions is possible. In this paper present a detailed analysis of model prediction of radiation damage effects and experimental results performance changes. The dramatic increase of the integrated luminosity in the last two years permits also expectations for extreme conditions of running.