Wendelstein 7-AS was the first modular stellarator device to test some basic elements of
stellarator optimization: a reduced Shafranov shift and improved stability properties resulted …

The differences and similarities between the internal transport barriers (ITBs) of tokamak and
helical plasmas are reviewed. By comparing the characteristics of the ITBs in tokamak and …

The optimized superconducting stellarator device Wendelstein 7-X (with major radius, minor
radius, and plasma volume) restarted operation after the assembly of a graphite heat shield …

After completing the main construction phase of Wendelstein 7-X (W7-X) and successfully
commissioning the device, first plasma operation started at the end of 2015. Integral …

The two leading concepts for confining high-temperature fusion plasmas are the tokamak
and the stellarator. Tokamaks are rotationally symmetric and use a large plasma current to …

The optimized, superconducting stellarator Wendelstein 7-X went into operation and
delivered first measurement data after 15 years of construction and one year commissioning …

Numerical results for the three mono-energetic transport coefficients required for a complete
neoclassical description of stellarator plasmas have been benchmarked within an …

Neoclassical transport processes are important to the understanding of plasma confinement
physics in doubly periodic magnetized toroidal plasmas, especially, after the impact of the …

In this work, we examine the validity of several common simplifying assumptions used in
numerical neoclassical calculations for nonaxisymmetric plasmas, both by using a new …

The transport of heavy impurities has been investigated at the Wendelstein 7-X stellarator
during core electron root confinement (CERC) experiments. Iron atoms were injected via the …