%0 Journal Article
%T Strip sensor performance in prototype modules built for ATLAS ITk
%A Helling, C. et al
%A Bernabeu, J.
%A Lacasta, C.
%A Solaz, C.
%J Nuclear Instruments & Methods in Physics Research A
%D 2020
%V 978
%I Elsevier
%@ 0168-9002
%G English
%F Helling_etal2020
%O WOS:000560076700015
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4505), last updated on Fri, 04 Sep 2020 14:06:02 +0000
%X ATLAS experiment is preparing an upgrade of its detector for High-Luminosity LHC (HL-LHC) operation. The upgrade involves installation of the new all-silicon Inner Tracker (ITk). In the context of the ITk preparations, more than 80 strip modules were built with prototype barrel sensors. They were tested with electrical readout on a per-channel basis. In general, an excellent performance was observed, consistent with previous ASIC-level and sensor-level tests. However, the lessons learned included two phenomena important for the future phases of the project. First was the need to store and test the modules in a dry environment due to humidity sensitivity of the sensors. The second was an observation of high noise regions for 2 modules. The high noise regions were tested further in several ways, including monitoring the performance as a function of time and bias voltage. Additionally, direct sensor-level tests were performed on the affected channels. The inter-strip resistance and bias resistance tests showed low values, indicating a temporary loss of the inter-strip isolation. A subsequent recovery of the noise performance was observed. We present the test details, an analysis of how the inter-strip isolation affects the module noise, and the relationship with sensor-level quality control tests.
%K Silicon strip sensors
%K Strip module
%K Inter-strip isolation
%K Readout noise
%R 10.1016/j.nima.2020.164402
%U https://doi.org/10.1016/j.nima.2020.164402
%P 164402-6pp