TY  - JOUR
AU  - Helling, C. et al
AU  - Bernabeu, J.
AU  - Lacasta, C.
AU  - Solaz, C.
PY  - 2020
DA  - 2020//
TI  - Strip sensor performance in prototype modules built for ATLAS ITk
T2  - Nucl. Instrum. Methods Phys. Res. A
JO  - Nuclear Instruments & Methods in Physics Research A
SP  - 164402
EP  - 6pp
VL  - 978
PB  - Elsevier
KW  - Silicon strip sensors
KW  - Strip module
KW  - Inter-strip isolation
KW  - Readout noise
AB  - 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.
SN  - 0168-9002
UR  - https://doi.org/10.1016/j.nima.2020.164402
DO  - 10.1016/j.nima.2020.164402
LA  - English
N1  - WOS:000560076700015
ID  - Helling_etal2020
ER  -