Thesis topics

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Stefan Roth

T2K/TPC

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+49 241 80 27296

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  • Are you interested in questions about the origin of our universe, especially the puzzle of what happened with the anti-matter after the big bang?
  • Would you like to work in the field of neutrino physics, an exciting part of modern particle physics, which has recently attracted attention through high-ranking prizes such as the 2015 Physics Nobel Prize?
  • Are you interested in the detector development for the measurement of neutrino interactions or to analyze the recorded data?
  • Would you like to do research as part of an international collaboration of institutes worldwide?
  • Are you fascinated by the opportunity to participate in an experiment with a location in Japan?

Then the T2K experiment would be an ideal place to perform your final thesis. Further informations on the goals and the setup of the T2K experiment can be found here, informations about the T2K group at the RWTH there .

Our working group currently offers bachelor and master theses on the following topics:

Themen für Bachelorarbeiten:

Teilchenidentifikation in den ND280 TPCs
Für die Teilchenidentifikation wird in den TPCs des Nahdetektors des T2K-Experiments der gemessene Energieverlust mit den Erwartungswerten für die verschiedenen Teilchenarten (z.B. Proton, Myon, etc.) verglichen. In dieser Bachelorarbeit soll die bereits existierende Parametrisierung des Energieverlustes mit Daten und Simulationen verglichen und verbessert werden.

Ein Trigger für eine Hochdruck-TPC
Eine Time-Projection-Chamber (TPC), die mit einem Vielfachen des Atmosphärendrucks betrieben wird, wird als sogenannte High-Pressure-TPC (HP-TPC) bezeichnet. Diese sind momentan im Fokus der Neutrino-Community, da sie bei noch ausreichender Wechselwirkungswahrscheinlichkeit eine sehr gute Auflösung des Endzustands der Neutrino-Wechselwirkung erlauben. Für erste Studien wird in unserer Gruppe eine Hochdruck Gas-Monitor-Kammer (HP-GMC) entwickelt und gebaut. Im Zuge der Arbeit soll ein Tigger-System entstehen, welches die Datennahme der Kammer auslöst.

Topics for Master's Theses :

Neutrino-argon cross-section measurements with the T2K TPCs
The T2K near detector employs three large, argon-filled TPCs. These TPCs have been exposed to the intense T2K muon-neutrino beam since the start of the experiment. Due to the low density of the gas, neutrino-argon interactions are comparatively infrequent, but the long exposure to the neutrino beam enables us to do cross section measurements. T2K is doing the world's first measurements in the given neutrino energy range and offers the lowest energy threshold to detect the products of the interaction. These measurements are used to refine the nuclear interaction models, which are an important theoretical input to any neutrino experiment. The goal of these theses is to improve previous measurements and/or develop new differential cross-section measurements.

Measurement of transversal and longitudinal diffusion in the T2K-TPCs
Many existing and future experiments in high energy physics rely on precision tracking using a Time Projection Chamber (TPC). The TPC concept requires that the diffusion of the ionization charge is not too large. Therefore, it is important to understand the diffusion of electron charge clouds in drift chamber gases. For this thesis topic a mini-TPC will be used that is identical to the gas monitoring chambers which were contributed by our group to the near detector of the T2K experiment. Up to now these chambers are used for the measurement of drift velocity and signal gain only. The main goal of this project is the measurement of electron diffusion by modifying this experimental setup.

Programming a FPGA for drift velocity measurements
Our group constrcuted small drift chambers and installed them as gas monitoring chambers at the near detector of the T2K experiment. For the trigger generation a dedicated trigger board using a Field Programmable Gate Array (FPGA) is installed. On the other hand the powerful and flexible FPGA can also be used to perform some measurements using this board. During this thesis, the existing firmware should be expanded towards doing measurements with the FPGA and these measurements should be verified against the existing setup.

Characterization of a preamplifier
In the read-out chain of TPCs, the signal adaptation to the analog-to-digital converter is a key element. The amplifiers used at this position should not change the input form of the signal to allow physical measurements as precise as possible. In this thesis, an existing preamplifier will be characterized for the full range of the expected electrical signals. On the other hand, a newly designed amplifier will be tested for its usability as a preamplifier for TPC signals.

In case of interest or questions please contact us.