The planned High Luminosity Large Hadron Collider is being designed to maximise the physics potential of the LHC with 10 years of operation at instantaneous luminosities of 7.5×1034cm−2s−1. A consequence of this increased luminosity is the expected radiation damage requiring the tracking detectors to withstand hadron fluence to over 1×1015 1 MeV neutron equivalent per cm2 in the ATLAS Strips system. Fast readout electronics, deploying 130 nm CMOS front-end electronics are glued on top of a silicon sensor to make a module. The radiation hard n-in-p micro-strip sensors used have been developed by the ATLAS ITk Strip Sensor collaboration and produced by Hamamatsu Photonics. A series of tests were performed at the DESY-II test beam facility to investigate the detailed performance of a strip module with both 2.5 cm and 5 cm length strips before irradiation. The DURANTA telescope was used to obtain a pointing resolution of 2 μm, with an additional pixel layer installed to improve timing resolution to ∼25 ns. Results show that prior to irradiation a wide range of thresholds (0.5–2.0 fC) meet the requirements of a noise occupancy less than 1×10−3 and a hit efficiency greater than 99%.

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Nuclear Inst. and Methods in Physics Research, A
Department of Physics

Blue, A.J. (A. J.), Affolder, A.A. (A. A.), Ai, X. (X.), Allport, P.P. (P. P.), Arling, J.-H. (J. H.), Atkin, R.J. (R. J.), … Zhu, H. (H.). (2018). Test beam evaluation of silicon strip modules for ATLAS phase-II strip tracker upgrade. Nuclear Inst. and Methods in Physics Research, A. doi:10.1016/j.nima.2018.09.041