| dc.identifier.citation | Ezekiel Staats, A. Affolder, G.A. Beck, A.J. Bevan, Z. Chen, I. Dawson, A. Deshmukh, A. Dowling, D. Duvnjak, V. Fadeyev, P. Federicova, J. Fernandez-Tejero, A. Fournier, N. Gonzalez, C. Jessiman, S. Kachiguin, J. Keller, C.T. Klein, T. Koffas, J. Kroll, J. Kvasnicka, V. Latonova, F. Martinez-Mckinney, M. Mikestikova, P.S. Miyagawa, S. O’Toole, Q. Paddock, L. Poley, E.A. Slavikova, B. Stelzer, P. Tuma, M. Ullan, Y. Unno, C. Westbrook, S.C. Zenz, Identification and recovery of ATLAS18 strip sensors with high surface static charge, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 1064, 2024, 169446, ISSN 0168-9002, https://doi.org/10.1016/j.nima.2024.169446. (https://www.sciencedirect.com/science/article/pii/S0168900224003723) Abstract: The new all-silicon Inner Tracker (ITk) is being constructed by the ATLAS collaboration to track charged particles produced at the High-Luminosity LHC. The outer portion of the ITk detector will include nearly 18,000 highly segmented and radiation hard silicon strip sensors (ATLAS18 design). Throughout the production of 22,000 sensors, the strip sensors are subjected to a comprehensive suite of mechanical and electrical tests as part of the Quality Control (QC) program. In a large fraction of the batches delivered to date, high surface electrostatic charge has been measured on both the sensors and the plastic sheets between which the sensors are packaged for shipping and handling rigidity. Aggregate data from across QC sites indicate a correlation between observed electrical failures and the sensor/plastic sheet charge build up. To mitigate these issues, the QC testing sites introduced recovery techniques involving UV light or flows of ionizing gas. Significant modifications to sensor handling procedures were made to prevent subsequent build up of static charge. This publication details a precise description of the issue, a variety of sensor recovery techniques, and trend analyses of sensors initially failing electrical tests (IV, strip scan, etc.). Keywords: HL-LHC; ATLAS; ITk | en_US |
| dc.description.abstract | The new all-silicon Inner Tracker (ITk) is being constructed by the ATLAS collaboration to track charged particles produced at the High-Luminosity LHC. The outer portion of the ITk detector will include nearly 18,000 highly segmented and radiation hard silicon strip sensors (ATLAS18 design). Throughout the production of 22,000 sensors, the strip sensors are subjected to a comprehensive suite of mechanical and electrical tests as part of the Quality Control (QC) program. In a large fraction of the batches delivered to date, high surface electrostatic charge has been measured on both the sensors and the plastic sheets between which the sensors are packaged for shipping and handling rigidity. Aggregate data from across QC sites indicate a correlation between observed electrical failures and the sensor/plastic sheet charge build up. To mitigate these issues, the QC testing sites introduced recovery techniques involving UV light or flows of ionizing gas. Significant modifications to sensor handling procedures were made to prevent subsequent build up of static charge. This publication details a precise description of the issue, a variety of sensor recovery techniques, and trend analyses of sensors initially failing electrical tests (IV, strip scan, etc.). | en_US |
