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Relevance of the work is caused by the need to develop new approaches to analysis and interpretation of model and experimental parameter distributions of low-temperature plasma of thermionic diode and to establish criteria (functionals) which allow obtaining quantitative estimates at model verification computer simulation. The main aim of the study: description and justification of the concept (algorithm) for processing experimental and calculation non-measurable parameter distributions of low-temperature plasma and design of functionals, which allow obtaining quantitative estimates of model verification. The methods used in the study: experimental data approximation and extrapolation in electrode sheath of a interelectrode gap, where it is impossible to carry out measurements; construction of phase portraits for model and experimental distributions of plasma parameters. The results: The author has stated and analyzed the concept of constructing and studying phase portraits of experimental and model parameters of low-temperature cesium plasma in thermionic diode on the planes plasma density - ion current density, electron temperature - electron energy density etc. Based on the analysis of the phase portraits of the plasma parameters the functionals were proposed. They allow estimating deviation in current-carry plasma state from thermodynamic equilibrium state. The behavior of this functional for plasma density and electron temperature was analyzed for model distributions of plasma parameters. The paper demonstrates the possibility to state and to test hypotheses on mechanisms of physical processes in plasma based on the analysis of plasma parameter phase portraits.