arXiv subjects

Giorgia Bonomelli

Publications and source records attributed to Giorgia Bonomelli.

3 recordsLinked to original sources

arXiv2026

Comprehensive Design Validation of serially powered CMS Phase-2 Pixel Modules

After the Large Hadron Collider (LHC) upgrade into High Luminosity LHC (HL-LHC), the instantaneous luminosity is expected to reach values up to 7.5x10^34cm^2/s, causing a harsher radiation environment as well as a significant increase in data rate. The current CMS Tracker detector would not be able to operate under these conditions and it will be replaced by an upgraded version known as Phase-2. In view of the detector upgrade and as part of the design validation process, a Quality Control (QC) test flow has been developed to characterize the first pixel modules prototypes and evaluate their performance. The results of this procedure were the starting point for small design adjustments, especially for the the High Density Interconnect or HDI, the flexible low mass PCB that distributes power and signals to the module and controls the readout through a high speed data transmission channel. This talk includes qualification tests performed on the CMS Phase-2 design to ensure that all the pixel module components satisfy the upgrade specifications, for example in terms of power consumption and leakage current stability. Additionally, stress tests were conducted to probe the limits of the design, demonstrating the robustness and endurance of the module layout. Due to the differing material properties of the HDI copper layers and the silicon sensor and readout chip, temperature gradients induce different thermal expansion and contraction, resulting in mechanical stress on the bump-bond interface. For this reason, among the destructive measurements, dedicated thermal stress tests were carried out to evaluate the bump-bond strength and durability for different bump bonding techniques.

physics.ins-det↗

arXiv2025

Performance and Design Validation of CMS Phase-2 Pixel Modules

In view of the High Luminosity LHC, the current CMS tracking detector will have to be replaced during Long Shutdown 3 to cope with the higher radiation environment and to withstand an increased data rate. To prepare for the so-called CMS Phase-2 upgrade, multiple studies were carried out to characterize the pixel module design and its performance with a particular focus on the Quality Control (QC) and Assurance. For this purpose, different aspects were put together to establish a module full-performance test procedure, and novel techniques became part of the module design validation process for the full-size readout chip (CROCv1). Based on the results collected on CROCv1 prototype modules and according to the module selection criteria the community agreed on, some changes were introduced in the module design to improve the performance. This resulted in multiple prototype versions, including the production of the definitive chip (CROCv2). This study presents the quality control test flow performed, both for the dual and quad-chip module designs, on a big sample of CROCv1 prototypes and on several Kick-off and CROCv2 pre-production modules. In particular, the validation process includes measurements of the readout chip powering, sensor IV bias and open bump bonds identification. Thermal stress tests in extended temperature ranges were performed only on a subset of pixel modules to ensure the integrity of the sensor and to provide quick feedback on the quality of the bump bond connectivity after harsh temperature cycles.

physics.ins-det↗

arXiv2021

Rivet, RivetHZTool and HERA -- A validation effort for coding HERA measurements for Rivet

During the DESY summer student program 2021, young scientists from more than 13 different countries worked together, connecting from remote, to provide computer codes within the Rivet framework for 19 HERA measurements. Most of these measurements were originally available within the HZTool package, but no longer accessible for modern analysis packages such as Rivet. The temporary RivetHZTool interface was used to validate most of the new Rivet plugins.

hep-ph↗