Inverse diffraction problem for the non-stationary layered plasma formations and their characterization by pulsed THz-wave beam

Summary form only given. The resonance phenomena in electromagnetic wave diffraction are studied for the objects´ characterization (i.e., to define in time domain an collisional damping, electron number density, including space distribution, etc. within different plasmas). Initially, the diffraction of etalon wave onto template object is theoretically researched and this way the relationships between incident field, diffractive fields and object´s parameters are established with assumption that last parameters are known. Secondarily, above-mentioned relationships are depictured in quasi-analytical representation - by the simplification of strong analytical solution, which gotten on first step, - and we establish the functional dependence between probing/scattering fields and template object´s parameters as variables. Finally, quasi-analytical representation is resolved to answer the question: which parameters of the studying object could provide exactly such dissipative fields that observed? The answers are found by the field extremum points´ analysis for such practical cases as thin dissipative plasma layer between two half-spaces; thick plasma layer in a rectangular wave guide; circular plasma cylinder within plate-parallel wave guide; plasma sphere of an arbitrary radius. Generalization of these solutions for the multi-layered formations, which have the same symmetry, is also represented. Non-stationary regime is considered as well. Theoretical results have been obtained for use in experimental characterization scheme in accordance with exploitation of the electron beam driven modulator incorporated with THz wave radiating structure, which is been developing at AccelBeam Photonics. Correlation between theoretically considered requirements and parameters of the installation for modulated T-waves´ producing is discussed.