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Prof. Dr. Stephan Paul

Photo von Prof. Dr. Stephan Paul.
Phone
+49 89 289-12571
Room
PH: 3263
E-Mail
stephan.paul@tum.de
Links
Homepage
Page in TUMonline
Group
Hadronic Structure and Fundamental Symmetries
Job Title
Professorship on Hadronic Structure and Fundamental Symmetries

Courses and Dates

Title and Module Assignment
ArtSWSLecturer(s)Dates
FPGA Based Detector Signal Processing Assigned to modules:
VO 2 Paul, S.
Assisstants: Huber, S.
Thu, 14:00–16:00, PH 3268
Modern Concepts for Radiation Detection Assigned to modules:
VO 2 Paul, S. Tue, 10:00–12:00, PH 3268
Selected Topics in Flavour Physics Assigned to modules:
HS 2 Paul, S. van Dyk, D.
Assisstants: Greenwald, D.
Fri, 12:00–14:00, PH 3268
and singular or moved dates
Happy Hour for Particle and Nuclear Physics Assigned to modules:
HS 2 Kaiser, N. Paul, S.
Assisstants: Greenwald, D.Grube, B.
Tue, 16:00–18:00, PH 3268
Exercise to FPGA Based Detector Signal Processing Assigned to modules:
UE 2 Gaisbauer, D. Huber, S. Levit, D. Steffen, D.
Responsible/Coordination: Paul, S.
Thu, 16:00–18:00, PH 3268
Introduction to C++ programming Assigned to modules:
UE 2 Paul, S.
Assisstants: Gerassimov, S.
Mon, 10:00–16:00, PH II 227
Modern Concepts for Radiation Detection Assigned to modules:
UE 2
Responsible/Coordination: Paul, S.
dates in groups
Excursion to CERN, Genf/Switzerland 2020 This course is not assigned to a module.
EX 1 Paul, S.
Assisstants: Dreisbach, C.Friedrich, J.Grube, B.
FOPRA Experiment 19: Transmission of Beta Particles Through Matter Assigned to modules:
PR 1 Paul, S.
Assisstants: Hollering, A.
FOPRA Experiment 65: Positron Emission Tomography (PET) Assigned to modules:
PR 1 Paul, S.
Assisstants: Gutsmiedl, E.
Colloquium of the Excellence Cluster ORIGINS Assigned to modules:
KO 2 Paul, S.
Revision Course to Happy Hour for Particle and Nuclear Physics Assigned to modules:
RE 2
Responsible/Coordination: Paul, S.
Scientific Topics in Particle Physics for Students and Staff Members Assigned to modules:
SE 2 Märkisch, B. Paul, S. Thu, 09:30–11:00, PH 3268
Seminar on Physics of strong interaction Assigned to modules:
SE 2 Brambilla, N. Fabbietti, L. Kaiser, N. Paul, S. Mon, 14:00–16:00, PH 3344

Offered Bachelor’s or Master’s Theses Topics

Antiparticle Production at BELLE and BELLE-II

Detection of antiparticle cosmic rays can be a key way to search for exotic sources of antimatter in our universe such as dark matter annihilation. Cosmic-ray antideuterons (an antiproton and antineutron bound together) are particularly good to look for since they are infrequently produced by non-exotic sources. However, the mechanism of their production from antiprotons and antineutrons---called coalescence---is poorly understood. We can study this process in the laboratory using decays of upsilon mesons (bound states of bottom and antibottom quarks) produced at the Belle experiment in Tsukuba, Japan (and in the near future at the Belle II experiment). To do this, we need to measure the momentum spectra of antideuterons and antiprotons produced by decaying upsilons. The task of this thesis work is to analyze existing data from the Belle experiment (and plan for future data from the Belle II experiment) to search for antiprotons and antideuterons in upsilon decays.

Tasks

Learn how an analysis is conducted at a high-energy physics experiment

Compose the analysis using C++ / Python

Check the accuracy of the analysis using simulated data

Prerequisites 

Experience in C++ or Python programming is helpful, but not required.

Contact

Thomas Pöschl, Room PH1 3257, Thomas.poeschl@ph.tum.de

Daniel Greenwald, Room PH1 3275, daniel.greenwald@tum.de

Prof. Stephan Paul, Room PH1 3263, stephan.paul@tum.de

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Stephan Paul
Aufbau eines 4He Gas Reinigers

Outline, calculation and design of a purification cryostat to produce isotopically pure He-4 out of natural helium in a continuous manner based on the superfluid heat flush principle.

The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used.

Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build.

In this thesis a small illustrator shall be build up, and its cool down characteristics shall be measured.

Contact / Supervisor:

Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Stephan Paul
Auslegung, Simulation und Design eines He Gas Reinigers zur Produktion von isotopenreinen He-4 mittels superfluider Wärmeströmung.

The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used.

Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build.

In the first phase a smaller illustrator shall be designed and made to prove feasibility and validate the concept. The above master thesis is part to this first phase.

In a second phase a scaled-up apparatus shall be manufactured for operational use.

Contact / Supervisor:

Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Stephan Paul
Design, Simulation and Development of Spectrometers for Spectral Imaging

At MPE, we are developing camera systems for ground- and satellite-based instruments in wavelength ranges from x-ray to infrared. In the frame of this master thesis, a spectrometer breadboard shall be developed that serves as a generic system in our laboratory. The use case of this spectrometer shall be earth observation. The focus of this master thesis lies in the evaluation of several spectrometer types including their main components like gratings, lenses, slits, etc., the derivation of the analytical correlations between performance and environmental influences (e.g. temperature variations) and the experimental setup of a selected spectrometer so that measurements will verify the design concept.

suitable as
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Stephan Paul
Kryotechnik Anwendungen Bau eines Reinigers für das Befüllen einer Heliumkälteanlage

Für eine Helium Kälteanlage soll ein Reiniger ausgelegt, gebaut und getestet werden.

Das Projektlastenheft wird gemeinsam erarbeitet.

Kontakt: Rainer Stoepler 089/ 28914272 oder 0162 2944773

rstoepler@tum.de

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Stephan Paul
Lebensdauermessung des freien Neutrons Charakterisierung eines Lebensdauerexperimentes für Ultrakalten Neutronen

Der Experimentaufbau wird zu Testzwecken ohne Neutronen betrieben.  Es handelt sich um einen Supraleitenden Magneten der als Speicher für Neutronen dient. Die hierzu notwendige Infrastruktur muss aufgebaut und getestet werden.

Neben der Einarbeitung in das Thema der Kern und Teilchenphysik werden Fähigkeiten zur Team-Arbeit in Forschergruppen und Projektmanagement Fähigkeiten für Naturwissenschaftler weiterentwickelt.

Das Projektlastenheft wird gemeinsam erarbeitet.

Kontakt: Rainer Stoepler 089/ 28914272 oder 0162 2944773

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Stephan Paul
Optimierung der Konverterkristallherstellung für die Produktion von Ultrakalten Neutronen Simulation eine Heliumkälteanlage mittels Matlab-Simscape®

Für eine bestehende Helium Kälteanlage soll ein Simulationsmodell in Matlab® programmiert und getestet werden. Das Simulationsmodell soll zur Regleroptimierung und zur Ausbildung von Anlagenbedienern genutzt werden. Es ist eine Gruppenarbeit von bis zu 2 Studierenden möglich.

Das Thema wird in bewertbare einzelne Arbeitspakete aufgeteilt sein. Neben der Einarbeitung in das Thema der Kern und Teilchenphysik werden Fähigkeiten zur Team-Arbeit in Forschergruppen und Projektmanagement Fähigkeiten für Naturwissenschaftler weiterentwickelt. Die Projektlastenhefte werden gemeinsam erarbeitet

Kontakt: Rainer Stoepler 089/ 28914272 oder 0162 2944773

rstoepler@tum.de

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Stephan Paul
Search for New Particles at the COMPASS Experiment at CERN

In nature, quarks and gluons cannot exist as free particles. They are always confined into hadrons. Unfortunately, the equations of the strong interaction that governs the behavior of quarks and gluons cannot be directly solved at energy scales where hadrons form. Hence theoretical predictions of hadron properties such as their masses and decay modes are very difficult. This is in particular true for hadrons that are made of the three lightest quarks: „up“, „down“, and „strange“. Also on the experimental side much confusion exists on what concerns masses, decay widths, and the assignment of quantum numbers of some observed hadrons, let alone the interpretation of their internal structure.

Our group participates in the COMPASS experiment at CERN, where we study the production of mesons (hadrons with integer spin) in the scattering of a 190 GeV pion beam off a stationary proton target. The produced highly excited mesons have extremely short life times of the order of 10^-24 seconds and can hence be measured only via their decay products. Our group employs and develops mathematically involved statistical analysis tools in order to identify the produced mesons with high sensitivity and to measure their properties with high precision. We have recently found a new meson with surprising properties and also did groundbreaking work on precision measurements of the properties of the pion. This science is directly connected to the understanding of the strong force at large distances and low energies and the search for new forms of matter and therefore addresses one of the last open questions of the Standard Model.

This science project, involves the use of several state-of-the-art technologies:

  • Building of analysis models in close collaboration with theorists
  • Handling of very large data sets (several Petabytes)
  • Elaborate data fitting with more than 1000 parameters
  • Use of large computing clusters (200 cores at E18 + 2000 cores at LRZ/Excellence cluster)
  • Software development to exploit new CPU/GPU technologies


In addition, we operate and maintain a large-scale scientific apparatus, which involves tasks like:

  • Calibration of particle detectors
  • Adaptation of large simulation codes


We offer thesis topics at various levels of difficulty, which cover a wide range of subjects in strong-interaction physics, statistics, and/or computer science. They include for example

  • Data handling and event selection
  • Simulation of high-energy scattering processes and detector response
  • Estimation of model parameters from high-dimensional data
  • Model building and model selection
  • Parallelization of analysis software


You have the opportunity to perform your own science analysis, e.g. searching for new particles and determining their properties. The analysis work can start at different levels within the analysis chain: from the selection of a reaction process itself in order to study the feasibility of a full-fletched analysis up to the final fitting process leading to scientific publications. The topic can be chosen according to personal preference and interest. Thesis projects usually involve travels to CERN.

Experience in programming (C++, Python) is helpful, but not required.

Contact: Boris Grube , room PH1 3574, Tel. 089 289 12588

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
Supervisor: Stephan Paul
Search for New Particles at the COMPASS Experiment at CERN

In nature, quarks and gluons cannot exist as free particles. They are always confined into hadrons. Unfortunately, the equations of the strong interaction that governs the behavior of quarks and gluons cannot be directly solved at energy scales where hadrons form. Hence theoretical predictions of hadron properties such as their masses and decay modes are very difficult. This is in particular true for hadrons that are made of the three lightest quarks: „up“, „down“, and „strange“. Also on the experimental side much confusion exists on what concerns masses, decay widths, and the assignment of quantum numbers of some observed hadrons, let alone the interpretation of their internal structure.

Our group participates in the COMPASS experiment at CERN, where we study the production of mesons (hadrons with integer spin) in the scattering of a 190 GeV pion beam off a stationary proton target. The produced highly excited mesons have extremely short life times of the order of 10^-24 seconds and can hence be measured only via their decay products. Our group employs and develops mathematically involved statistical analysis tools in order to identify the produced mesons with high sensitivity and to measure their properties with high precision. We have recently found a new meson with surprising properties and also did groundbreaking work on precision measurements of the properties of the pion. This science addresses one of the last open questions of the Standard Model of particle physics, which is the understanding of the strong force at large distances and low energies.

We offer thesis topics, which cover a wide range of subjects in strong-interaction physics, statistics, and/or computer science. The thesis work can start at different levels within the analysis chain: from the selection of a reaction process itself up to the final fitting process leading to scientific publications. The topic can be chosen according to personal preference and interest.

Experience in computer programming is helpful, but not required.

Contact: Boris Grube bgrube@tum.de, room PH1 3574, Tel. 089 289 12588

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Stephan Paul
Simualtion eines 4He Gas Reinigers mit COMSOL

Outline, calculation and design of a purification cryostat to produce isotopically pure He-4 out of natural helium in a continuous manner based on the superfluid heat flush principle.

The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used.

Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build.

In this thesis the thermodynamical properties of the purifier shall be simulated with COMSOL.

Contact / Supervisor:

Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Stephan Paul
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