Bachelorarbeiten zu Software
| Thema: | Using YOLO for Latent Space Clustering in GNN-Based Track Finding at Belle II |
| Zusammenfassung: | Graph Neural Networks (GNNs) have proven effective for charged particle track reconstruction at Belle II. A key challenge in these approaches is the efficient clustering of detector hits in latent space to identify track candidates. This project investigates the use of the industry-standard YOLO (You Only Look Once) object detection algorithm as a method for clustering in the latent space produced by a GNN-based tracking pipeline. Instead of conventional bounding boxes, you will explore the use of multi-dimensional ellipsoids to encapsulate clusters in latent space, aiming for a more accurate representation of the underlying distribution of track-related features. The work will involve adapting YOLO-style detection techniques for this purpose, integrating them into the existing tracking framework, and evaluating their performance on simulated Belle II data with respect to track finding and fitting efficiency, and momentum resolution. |
| Sie lernen kennen: | Object detection methods in machine learning, advanced pattern recognition for particle tracking, neural network interpretability and integration techniques |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Lea Reuter |
| Letzte Änderung: | 07.08.2025 |
| Thema: | GNN-Based ROI Finding in the Pixel Detector Using SVD Track Extrapolation at Belle II |
| Zusammenfassung: | Track reconstruction at Belle II begins in the outer detectors, where occupancy is lower and pattern recognition is more efficient. An existing one-shot GNN-based algorithm for track finding in the Silicon Vertex Detector (SVD) provides a first reconstruction of charged particle trajectories. This information can be used to define a Region of Interest (ROI) in the innermost Pixel Detector (PXD), significantly reducing the combinatorial complexity in subsequent reconstruction steps. This project focuses on using SVD tracks reconstructed by the GNN algorithm to define ROIs in the PXD. You will develop and evaluate methods for projecting GNN-reconstructed tracks into the PXD, identifying the spatial volume in which associated hits are expected. The goal is to efficiently isolate relevant PXD hits, suppress background, and provide a clean input for downstream track fitting and vertex reconstruction. Particular emphasis will be placed on performance under high background conditions and integration into the existing Belle II software framework. |
| Sie lernen kennen: | GNN-based track reconstruction, detector geometry and projection techniques, ROI definition under realistic detector conditions, integration of machine learning with classical reconstruction algorithms |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Tristan Brandes |
| Letzte Änderung: | 07.08.2025 |
| Thema: | GNN-Based Track Finding on Remaining Hits After Conventional Reconstruction at Belle II |
| Zusammenfassung: | Conventional tracking algorithms at Belle II are highly optimised for efficiency but may miss tracks in high-occupancy or low-momentum regions, or in events with complex topologies. These missed tracks can have a significant impact on physics analyses, particularly those involving secondary vertices or long-lived particles. This project investigates a hybrid approach in which graph neural network (GNN) based track finding is applied after the standard reconstruction, using the remaining, unassigned hits. You will integrate a GNN tracking pipeline into the Belle II reconstruction framework to operate as a second-stage algorithm. The focus will be on identifying tracks that evade conventional pattern recognition, improving overall reconstruction efficiency. Tasks include defining suitable input data from remaining hits, training and optimising the GNN for this use case, and evaluating performance with respect to track recovery rates and reconstruction quality. |
| Sie lernen kennen: | Hybrid tracking strategies, advanced GNN architectures for particle physics, integration of machine learning with conventional algorithms, reconstruction efficiency optimisation |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Lea Reuter |
| Letzte Änderung: | 07.08.2025 |
| Thema: | Slow Control Software for the AI-Based Calorimeter Trigger CaloClusterNet in Belle II |
| Zusammenfassung: | The AI-based calorimeter trigger at Belle II requires precise control over hardware parameters to ensure stable and efficient operation. A robust slow control system is essential for configuring trigger settings, monitoring system health, and responding to environmental changes in real time. In this project, you will develop slow control software in C/C++ to manage and optimize the AI-based calorimeter trigger. This includes implementing configuration interfaces, integrating hardware monitoring tools, and designing automated response mechanisms to maintain stable trigger performance. Your work will directly contribute to the reliable operation of this state-of-the-art trigger system in a high-energy physics experiment. |
| Sie lernen kennen: | FPGA slow control |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Marc Neu |
| Letzte Änderung: | 04.06.2025 |
| Thema: | Data Quality Monitoring for the AI-Based Calorimeter Trigger CaloClusterNet in Belle II |
| Zusammenfassung: | Ensuring high data quality is critical for the AI-based calorimeter trigger at Belle II, as it will play a key role in real-time event selection. A dedicated data quality monitoring system is needed to evaluate trigger performance, detect anomalies, and optimize trigger efficiency under varying conditions. In this project, you will implement data quality monitoring information for the calorimeter trigger to the Belle II data quality monitoring framework MiraBelle. Your work will involve designing monitoring tools, implementing visualization dashboards, and analyzing trigger performance metrics. You will focus on detecting inefficiencies, identifying systematic biases, and ensuring that the AI-based trigger operates at peak performance throughout data-taking periods. |
| Sie lernen kennen: | FPGA slow control |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Isabel Haide |
| Letzte Änderung: | 04.06.2025 |
| Thema: | GNN-Based Track Reconstruction in the Silicon Pixel Detector of Belle II |
| Zusammenfassung: | The Belle II Pixel Detector (PXD), located closest to the interaction point, presents unique challenges due to its small pixels and extreme background conditions. Efficient track reconstruction in this environment is crucial for precise vertex determination in Belle II. This project will extend the CATFinder ) to incorporate information from the high-resolution PXD. You will develop a GNN-based approach that integrates PXD data into the existing tracking framework, optimizing it for the high-occupancy conditions near the beam pipe. Your work will focus on improving robustness against background hits, refining pattern recognition, and enhancing overall tracking efficiency in the inner detectors of Belle II. |
| Sie lernen kennen: | advanced track reconstruction techniques in particle physics, machine learning |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Lea Reuter |
| Letzte Änderung: | 04.06.2025 |
| Thema: | Automated process monitoring with workflow management software towards sustainable computing |
| Zusammenfassung: | In High Energy Physics many calculations are done on complex data. Since every calculation increases energy consumption, it is important to do these as sensible and efficient as possible. While some computing sites already provide data on the power usage of these calculations, it is still difficult to monitor the energy consumption of whole analysis workflows. In this project, an existing workflow management based on the software luigi will be extended to automatically collect data on the energy usage of its tasks. |
| Sie lernen kennen: | workflow management software (luigi), monitoring and accounting of computing resources, databases |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Jonas Eppelt |
| Letzte Änderung: | 04.06.2025 |
| Thema: | Performance optimization for Machine Learning reconstruction algorithms |
| Zusammenfassung: | This thesis project centers on optimizing the performance of Machine Learning (ML) reconstruction algorithms, particularly focusing on Python algorithms and their integration with C++ interfaces for the high-level trigger at Belle I running on a large computing cluster. As a bachelor student, your primary objective will be to streamline the execution of ML reconstruction algorithms on CPUs and GPUs. You will explore techniques such as algorithm parallelization, memory management, and code optimization to achieve optimal performance in both Python and C++ environments. Through rigorous benchmarking and profiling, you will evaluate the impact of your optimizations on the reconstruction speed and resource utilization. By the end of your thesis, you will have contributed to the development of robust and efficient ML reconstruction pipelines, essential for high-level trigger systems in particle physics experiments. |
| Sie lernen kennen: | advanced track reconstruction techniques in particle physics, advanced C++ optimization |
| Referent: | Prof. Dr. Torben Ferber |
| Ansprechpartner: | Dr. Giacomo De Pietro |
| Letzte Änderung: | 04.06.2025 |