Comparison of the wavenumber sensitivity and the spatial resolution between Langmuir probes and reflectometry in a longitudinally magnetized RF plasma waveguide

Much effort is being done to understand the connection between fluctuations and anomalous transport processes in tokamaks and stellarators. Several diagnostics such as Langmuir Probes, Microwave Reflectometry, Scattering, Heavy Ion Beam Probe (HIBP)..., are used at present, to investigate fluctuations and turbulence in fusion plasmas. However, there are still many open questions in the interpretation of the experimental measurements. In particular, the spatial resolution of the Reflectometry and the wavenumber sensitivity of both Reflectometry and Langmuir Probes are important issues not well understood. (author) 9 refs., 4 figs