The present experimental work investigates plasma turbulence in the edge region of magnetized high-temperature plasmas. A main topic is the turbulent dynamics parallel to the magnetic field, where hitherto only a small data basis existed, especially for very long scale lengths in the order of ten of meters. A second point of special interest is the...

Using the 'virtual casing' principle the parallel MFBE2001 code computes the magnetic field of three-dimensional ideal MHD equilibria in a form suitable for tracing field lines and guiding centres. This report gives a detailed description of theory, numerical methods and use of MFBE2001. Examples for tokamak, currentless stellarator and quasi-axisy...

The work investigates the Alfven instabilities that can be driven by circulating energetic ions in optimized stellarators of Wendelstein line. A general expression for the growth rate of the instabilities is obtained and analyzed. It is shown that the absence of the axial symmetry makes it possible that various types of Alfven eigenmodes will be de...

The Helias reactor is a scaled-up version of the Wendelstein 7-X experiment. A straightforward extrapolation of Wendelstein 7-X leads to HSR5/22, which has 5 field periods and a major radius of 22 m. HSR4/18 is a more compact Helias reactor with 4 field periods and 18 m major radius. Stability limit and energy confinement times are nearly the same ...

In the following chapter, an overview and references on the physics and geometry of helical advanced stellarators is given. On the basis of this configuration, the influence of magnetic field geometry is then discussed in a basic model of drift-Alfven wave turbulence which contains the necessary physics that applies to the plasma edge. By means of ...