Plasma Edge Physics

The working group is investigating the physics of the plasma edge region

The group’s activity concentrates on mainly four focal topics:

• Operation and development of diagnostics in the plasma edge region, which is influenced by steep gradients in the edge transport barrier as well as fast temporal changes due to instabilities.
  
  
• Integrated data analysis: in the framework of Bayesian probability theory the data of different diagnostics are jointly analyzed, so that redundant as well as complementary information can be used.
  
  
• Investigation of physical processes at the plasma edge which lead to and influence the edge transport barrier, as well as the processes which determine particle and heat transport.
  
  
• Investigation of turbulence: Turbulence is known to cause significant heat and particle losses in fusion plasmas across core, edge and SOL. To cover these regions, a combination of diagnostics (Doppler reflectometry, Lithium beam and Langmuir probes), is employed. In particular, wavenumber spectra, radial and poloidal correlation lengths and propagation of filaments are central topics of investigation.