Abstract
We have designed modules and a service structure of silicon microstrip detectors as a part of the ATLAS inner tracker for the SLHC project on the basis of a modular and replaceable concept. Six modules have been completed with common components and by similar procedures. Single module tests and four-module combined tests were performed at each site and have been compared for crosschecking. Details of the module design and electrical performance are presented. A half-module was irradiated up to 5 × 1014 1-MeV neq/cm2 using 24-GeV protons at the CERN PS. Its electrical performance was investigated before and after irradiation. The design of an eight-module structure, which is insertable to and is replaceable from the overall structure, has also been reported.
Highlights
We have designed modules and a service structure of silicon microstrip detectors as a part of the ATLAS inner tracker for the SLHC project on the basis of a modular and replaceable concept
Four aluminium nitride (AlN) ceramic-facing plates are attached along the two sides of the substrate, which are the piers of the hybrids and have precision holes for module mounting
Proton irradiation was performed at CERN PS in November 2009; 24-GeV protons were irradiated over a half-module, which was set on a motorized scanning table (x, y, θ )
Summary
Proton irradiation was performed at CERN PS in November 2009; 24-GeV protons were irradiated over a half-module, which was set on a motorized scanning table (x, y, θ ). The module was inclined to the beam axis to minimize the scan area to approximately 10 cm. The sensor was biased at 100V, and the chips were powered and clocked during irradiation. The temperature of the module was maintained at -25C◦. The hybrid temperature was approximately +3 C◦. The measured fluence and its error were found to be 5 × 1014 1-MeV neq/cm and ±7%, respectively. No decrease in gain was observed after irradiation. No significant degradation in terms of ENC or NO was observed after irradiation. NO values before and after irradiation of two different modules were compared.) The measurement of charge collection efficiency using the binary readout ABCN chips is still under investigation
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