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Abstract
A complex of measures that utilize gas-dynamics effects for passive protection of optical elements, which are positioned deep in the diagnostic channels in the region of the ITER divertor, is considered. The proposed control methods are considered using an example of protection of optical elements for diagnostics of Thomson scattering at the ITER-tokamak divertor. To suppress the diffusive propagation of impurities, it is proposed to use the sorption properties of the walls of the diagnostic channels via an increase in their area. The presented experimental results are compared to the results of numerical calculations that confirm the efficiency of the proposed method. To suppress the convective propagation of impurities, it is proposed to use additional walls of the channel with a geometry that determines separation and deflection of flows and diaphragms for hydraulic deceleration of gas flows.
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