Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Detector systems I

T 12.5: Talk

Monday, March 30, 2020, 17:35–17:50, H-HS XIII

Test Beam Results from ATLAS ITk Strip End-Cap modules — •Arturo Rodriguez Rodriguez, Marc Hauser, Ulrich Parzefall, Frederik Ruehr, Dennis Sperlich, and Liv Wiik-Fuchs — Universität Freiburg - Physikalisches Institut, Hermann-Herder Str. 3a, 79104 Freiburg, Germany

To cope with the occupancy and radiation doses expected at the High-Luminosity LHC accelerator, the ATLAS experiment will replace its Inner Detector with an all-silicon Inner Tracker (ITk), consisting of pixel and strip subsystems. The strip subsystem will be built from modules consisting of n+-in-p silicon strip sensors, and PCB hybrids containing the front-end electronics glued directly to the sensor. A powerboard, including an HV switch, a monitoring and control ASIC, and a DC-DC converter, is also glued to the sensor. In the last year, two prototype strip modules have been tested using beams of high energy electrons produced at the DESY II test beam facility. The modules tested are built from the annular R0 sensor, which will be used in the forward End-Cap region. For the first time, the final production version of the readout electronics, known as ABCstar, has been used. One of the R0 modules has been tested after irradiation to 50% beyond the expected end-of-lifetime fluence. The data allow for thorough tests of the module performance, noise occupancy, detection efficiency, and tracking performance. Moreover, the excellent tracking resolution allows for detailed studies of various strip sensor features. The results give confidence that the ITk strip detector will meet the requirements of the ATLAS experiment.