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The measurement of divertor plasma parameters is an important problem for ITER from the point of view of performance evaluation and physics. The activity in the field of developing laser-induced fluorescence diagnostics (LIF-technique) for measuring plasma parameters in the divertor with good spatial and temporal resolution is presented. These parameters include the density and temperature of helium and inert gases (Ne, Ar, Kr), which are injected to distribute energy fluxes over a large surface. The development of Collisional-Radiative Models is intended to help interpret the LIF-technique experimental information, and to devise methods to measure the local parameters of electron components by LIF-methods.Experiments in modelling helium have been performed on the T-10 tokamak and the HELLA devices. Measurements of Ar 1þ ion temperature and density by laser spectroscopy methods have been carried out on the PNX-U machine. The parameters of a prototype laser source are presented.

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