The growing demand for cheap and sustainable energy constitutes one of the major challenge of our century. Nuclear fusion has the potential to cover the energy needs of the world’s population and can provide a clean, secure and viable option to replace fossil energy sources. Fusion is a virtually unlimited energy source as sufficient fuel (deuterium) is available in our oceans and tritium can be retained from lithium, which is available in our Earth’s crust. A promising route to a nuclear fusion power plant is the use of toroidal magnetic fields in order to confine a high-temperature plasma with fusion-relevant properties, i.e. sufficient particle density and temperature. A large international effort is undertaken to develop the ITER project.
Magnetohydrodynamic (MHD) instabilities are a universal phenomenon in laboratory as well as astrophysical plasmas. An example for such an instability is the edge localized mode (ELM) which occurs at the plasma edge of a fusion plasma and ejects a jet of hot plasma similar to solar flares on the edge of the Sun. ELMs appear during a mode of tokamak operation in which energy is retained more effectively and pressure builds up at the edge of the plasma. This mode of operation is also called high confinement mode (H-mode) and is the operational regime foreseen for the next-step fusion device ITER. ELMs eject particles and energy from the plasma thus leading to a transient degradation of the plasma edge and a deterioration of plasma confinement. The successful realization of fusion relies, therefore, in a thorough understanding of edge stability and ELM control. For future fusion devices, the control or even full suppression of ELMs is mandatory.
The overall objective of this project is to advance in the understanding of ELMs and the impact they have on plasma transport.
