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The quasi-optical segmented mirror for a formation of the target irradiationfield was manufactured and investigated. It was designed for the high power THzbeam of the free electron laser (FEL) using as a target a dust particle cloud,simulating cosmic dust. Numerical calculation of the beam shape and its lowpower laboratory measurements was made in the spectral region 1 - 3 THz of thefirst phase of the Novosibirsk FEL construction. The theoretical calculationsof the diffraction effects reveal a speckle structure of a target spot, whichwas confirmed by the laboratory experiment. The beamformer technology wasadapted for manufacturing and such device could be widely used for aconcentration of powerful terahertz radiation.

The Segmented Beamformer for Electromagnetic Waves of the Terahertz Free Electron Laser