Laser-aided edge diagnostics

The objective of laser-aided edge diagnostics is closely connected with plasma wall interaction processes. Thus at first a short description of the plasma regions near first wall, limiter or divertor nad the most important quantities and processes to be evaluated there is given. A very important technique to measure electron densities and temperatures in the edge is Thomson scattering. Collective scattering represents a useful method to quantify fluctuations of electron density and their relation to particle and energy transport. To detect neutral particles and energy transport. To detect neutral particles and ions after their release from the wall and during recycling phases laser induced fluorescence (LIF) is a well established technique. Future applications of laser diagnostics as two-photon scattering and coherent anti-Strokes Raman scattering (CARS) are discussed.