Operation and performance of the ATLAS semiconductor tracker

Aad, G and Abbott, B and Abdallah, J and Khalek, SA and Abdinov, O and Aben, R and Abi, B and Abolins, M and AbouZeid, OS and Abramowicz, H and Abreu, H and Abreu, R and Abulaitia, Y and Acharya, BS and Adamczyk, L and Adams, DL and Adelman, J and Adomeit, S and Adye, T and Agatonovic-Jovin, T and Aguilar-Saavedra, JA and Agustoni, M and Ahlen, SP and Ahmad, A and Ahmadov, F and Aielli, G and UNSPECIFIED and UNSPECIFIED (2014) Operation and performance of the ATLAS semiconductor tracker. JOURNAL OF INSTRUMENTATION, 9. ISSN 1748-0221

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Abstract

The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74±0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, δ-ray production and energy loss presented. The alignment of the detector is found to be stable at the few-micron level over long periods of time. Radiation damage measurements, which include the evolution of detector leak- age currents, are found to be consistent with predictions and are used in the verification of radiation background simulations.

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