Stellenangebote - Master Arbeiten

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:

• Casimir Kräfte und Quantenreibung
• Nicht-Newtonische Gravitation
• Axion-Suche (Dark Matter Kandidat)
• Geometrische Phasen

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:

• P.D. Maarten DeKieviet (maarten.dekieviet@physik.uni-heidelberg.de)

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!

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.  
 

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
considerable speed-up over CPU-based execution is possible on FPGAs.
We can offer several topics for theses:

1. focusing on performance simulation aspects and model optimizations
2. limiting the input data to e.g. the pixel detector only and studying the performance if the GNN only delivers track seeds or even only hit triplets
3. focusing on model translation and hardware deployment
4. studying the robustness of the models with respect to detector deformations

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.

Modern precision measurements are almost universally based on frequency metrology, in which the measurement duration and management of systematic errors can together produce unrivaled sensitivity. Neutrons and noble gas nuclei have the additional special feature that due to weak coupling to environmental sources of decoherence, measurements of minutes to hours in duration are possible without spoiling the coherence of the desired superposition state. We are developing advanced storage technology for spin-precession measurements, which are based on pulsed NMR with neutrons and two-photon laser spectroscopy with noble gases. A long-term goal is to use measurements with noble gases, in a special magnetically shielded room at Heidelberg, to constrain systematic errors for neutron measurements performed in Grenoble at the Institut Laue-Langevin in the framework of the international PanEDM collaboration.

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