Ruprecht Karls Universität Heidelberg
Bild Institut
Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg

Tel: +49 6221-54 19600
Fax: +49 6221-54 19540
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Stellenangebote - Master Arbeiten

Master Arbeiten

Development of a new pixel detector in High Voltage-MAPS technologyAndré 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.

Ionisation Loss in Monolthic Pixel SensorsAndré Schöning
Charged particles in matter loose energy by ionisation. This process is described by the Bethe-Bloch equation. In the past, this energy loss was experimentally determined by measuring the energy difference between incoming and outgoing particles. High Voltage Monolithic Active Pixel Sensors allow the direct measurement of the energy loss inside the sensor, where the size of active charge collection area is defined by the the bias voltage of the charge collecting diode. In a measurement campaign at the Paul Scherrer Institute (Switzerland) in 2021 several data sets have been collected with different sensors. The goal is to study both, the ionisation loss as well as the charge collection efficiency. The data are key for the understanding and design of the next generation of pixel sensors. Within this master thesis the ionisation loss inside the pixel sensor should be measured and modeled. The results should be used as input for simulations. Requirements: Programming skills (e.g. C++) and interest in particle physics and instrumentation techniques.

Calculating and modelling neutron reflection from quantum potentialsSkyler Degenkolb
The spin- and energy-dependent absorption of neutrons using in-situ quantum-sensing methods will be a key element of next-generation experiments measuring the neutron's structure and properties with high precision. Detailed calculations are needed to supplement experimental data, and will help guide the choice of an optimal detector configuration. Multiple bachelor and master projects are available, focusing on different aspects of the interaction of the neutron wavefunction with magnetic fields and material barriers (e.g., tunneling and barrier penetration).

Calculating and modelling multiphoton absorption in direct frequency-comb spectroscopySkyler Degenkolb
Multiphoton absorption is a single-atom nonlinear process that provides access to additional degrees of freedom in the atom-light interaction. Modelocked pulsed laser fields can be used with exquisite resolution to excite 'challenging' atomic species such as ground-state noble gas atoms, or (in principle) hydrogen or anti-hydrogen. This provides an all-optical means to manipulate or read out internal states, including nuclear spin, for precision measurements. Detailed calculations of the absorption process and the influence of spectral phases are needed to optimize the sensitivity of these new methods, and will inform the use of an ultraviolet laser sytem to be installed at the Physikalisches Institut within the LEPP group.

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