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|Experimentelle und theoretische Tests der Quantenmechanik bei niedrigsten Energien||Maarten DeKieviet|
Das in Heidelberg entwickelte 3He-Atomstrahl-Spinecho-Spektrometer ermöglicht das Vermessen kleinster Energieänderungen (~100 peV) in der Wechselwirkung zwischen Atomen und Felder oder Materie. Das Experiment ist in seiner Form weltweit einzigartig und erforscht derzeit:
Für diese spannenden und grundlegenden physikalischen Fragen können wir Hilfe gebrauchen, sowohl am Experiment, als auch bei der Theorie. Interesse mit zu machen? Dann meldet euch bei:
|New Physics using Geometric Algebra||Maarten DeKieviet|
Instead of having special mathematics for all the different fields of physics, Geometric Algebra (GA) supplies a unified and unifying mathematical language for the whole of physics. It not only allows for a geometric interpretation of the constituent elements, it uncovers hidden connections between the otherwise seemingly unrelated mathematical descriptions. „Why hasn‘t anyone told me that before?“ is a regularly heard, awing reaction of students being exposed to this language for the first time. We are currently searching for discrepancies with and extensions of the regular mathematical approach, both theoretically and experimentally. These are exciting times, come and join us!
|Development of a new pixel detector in High Voltage-MAPS technology||André Schöning|
|Our group is developing new pixel detectors based on the High-Voltage MAPS (monolithic active pixel detector) technology. Monolithic pixel detectors are in many respects superior compared to standard hybrid silicon detectors. High Voltage-MAPS will be used for the new Mu3e experiment are also considered for the LHC-High Luminosity Upgrades. We offer several bachelor and master theses in this area.|
|Muon Physics at PSI||André Schöning|
The Paul Scherrer Institute (PSI, Switzerland) operates the highest intensity proton accelerator (HIPA) in the world. This facility also provides high intensity muons beams where the muons are produced in pion decays. An upgrade of the accelerator is planned for 2026 with the goal to increase the muon beam intensity by almost two orders of magnitude, thus providing 10^10 muons per second. This upgrade will dramatically increase the discvery potential for rare physics processes like mu->eee (Mu3e Phase II) and mu-> e gamma which are also called the "golden" muon decay channels. Simulation and design studies need to be performed to reduce background and optimise the sensitivity.
|Track Reconstruction with Graph Neural Networks for the ATLAS Trigger System||André Schöning,|
Our group explores the feasibility of applying modern machine learning algorithms such as Graph NeuralNetworks (GNN) deployed on FPGAs for online track reconstruction within the ATLAS online server farm for the High-Luminosity LHC (HL-HLC) upgrade. GNNs are a powerful class of geometric deep learning methods for modelling spatial dependencies via message passing over graphs. They are well-suited for track reconstruction tasks by learning on an expressive structured graph representation of hit data. A
|Development of a new pixel detector for 50 MeV photon conversion||André Schöning|
The next generation of experiments searching for the charged lepton flavor violating decay mu -> e gamma will potentially exploit an Active Photon Converter for precise measurement of the energy, position and direction. Active photon converters are believed to be superior over standard calorimeters for photon energies of interest (53 MeV). Our group is developing an active photon converter based on High Voltage Monolithic Active Pixel Sensors (HV-MAPS). The group is developing HV-MAPS since more than 10 years and the task of the thesis is to demonstrate the proof of this new concept. If successful, this work would lead to a new experimental concept for the detection of rare mu -> e gamma decays with unprecedented sensitivity. Such an experiment could be installed at the new High Intensity Muon Beamline at the Paul Scherrer Institute which which starts operation in 2028.
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