Projekt

Tokamak Simulations

Udbyder

Vejleder

Sted

København og omegn

Fusion as a future energy source

Magnetic confinement fusion is a promising candidate for a clean, reliable and sustainable energy source. The idea is to fuse hydrogen isotopes to Helium, a process that releases a large amount of energy. This process has kept our Sun burning for the last four billion years. However, the necessary temperatures to sustain fusion on Earth lie around 100 Million Kelvin. A gas this hot is in the so-called plasma state and is typically highly turbulent. On the Sun, this manifests in the form of solar flares that expel into the surrounding empty space. On Earth, we have to confine the plasma with magnetic fields and material walls. A corresponding flare can therefore hit a plasma facing material component of the wall, which is then subject to similar or even higher heat loads to a spacecraft reentering Earth’s atmosphere. A heat load this high is unacceptable in a fusion power plant. Since the lifetime expectancy of such a plant should be years, it is crucial to understand and ultimately inhibit certain unwanted transport processes in the plasma.

 

The new Danish Tokamak

Our institute recently acquired a so-called tokamak. A tokamak is essentially a toroidally shaped vacuum vessel together with a magnetic field that confines the plasma. It can be viewed as the small scale version of the future fusion power plant and is well-suited for the study of plasma behavior.

 

Plasma description

For the description of low-frequency phenomena in magnetized plasmas, so-called drift-reduced Braginskii (also called drift-fluid) and gyro-fluid models are efficient. Both of these approaches remove the fast time and spatial scales associated with the gyration of charged particles in the magnetic field. Compared to the most accurate kinetic descriptions the reduced dimensionality in fluid models significantly lowers the complexity of the model. Still, purely analytical approaches exist only for the most simplified model equations.

 

Simulations

Due to the complexity of the underlying model equations, we use simulations to gain insight into the physical mechanisms of the plasma. The value of simulations is that they offer a complete determination of all variables involved. Ideally, a simulation is a virtual laboratory.

 

Research plan

The goal of this project is to study the plasma in the new tokamak with the help of numerical simulations. Open research questions are for example the fluctuation levels of the plasma density or the optimization of magnetic field configuration. The work will be in close collaboration with the experimental group in our institute. Ideally, the simulation results will be validated against experimental probe measurements. The simulations will be setup with the help of the Feltor library (https://feltor-dev.github.io).  Feltor is an easy-to-use free software package that we have developed particularly for the use in drift- and gyro-fluid models.

 We offer both bachelor and master theses on this topic.

 






Forudsætninger

Fluid- and Electrodynamics are advantageous

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Kontakt

Virksomhed/organisation

DTU Fysik

Navn

Matthias Wiesenberger

Stilling

Postdoc

Mail

mattwi@fysik.dtu.dk

Vejleder-info

Bachelor i Fysik og Nanoteknologi

Vejleder

Matthias Wiesenberger

Medvejledere

Stefan Kragh Nielsen

ECTS-point

15 - 30

Type

Bachelorprojekt, Kandidatspeciale

Kandidatuddannelsen i Fysik og Nanoteknologi

Vejleder

Matthias Wiesenberger

Medvejledere

Stefan Kragh Nielsen

ECTS-point

15 - 30

Type

Bachelorprojekt, Kandidatspeciale

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

Find os her

Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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