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Novel approach for density measurements at the edge of a hot plasma device ispresented - Microwave Interferometer in the Limiter Shadow (MILS). Thediagnostic technique is based on measuring the change in phase and power of amicrowave beam passing tangentially through the edge plasma. The wavepropagation involves varying combinations of refraction, phase change andfurther interference of the beam fractions. A 3D model is constructed as asynthetic diagnostic for MILS and allows exploring this broad range of wavepropagation regimes. The diagnostic parameters, such as its dimensions,frequency and configuration of the emitter and receiver antennas, should bebalanced to meet the target range and location of measurements. It can betherefore adjusted for various conditions and here the diagnostic concept isevaluated on a chosen example, which was taken as suitable to cover densitiesof ~10^15-10^19 m^-3 on the edge of the ASDEX Upgrade tokamak. Based on adensity profile with fixed radial shape, appropriate for experimental densityapproximation, a database of syntethic diagnostic measurements is built. Thedeveloped genetic algorithm genMILS of density profile reconstruction using theconstructed database results in quite low numerical error. It is estimated as ~5-15 % for density >10^17 m^-3. Therefore, the new diagnostic technique (withdedicated data processing algorithm) has a large potential in practicalapplications in a wide range of densities, with low numerical error, so thetotal error and the density estimation accuracy is expected to be defined byexperimental uncertainties.

A new technique for tokamak edge density measurement based on microwave interferometer