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Theoretical and experimental aspects of high-energy particle fluxes and irradiation formation from dense plasma


MoskvitinА.О., MoskvitinaY.K., GirkaО.І., BabenkoIe.V.

V. N. Karazin Kharkiv National University


Theaimoftheworkisdevelopmentofphysicalmodelsofhigh-energy particle fluxes and irradiation formation from dense plasma.

Physical model of high-energy particle fluxes formation was developed. These particles were assumed to be produced in nuclear fusion reactions in toroidal magnetic gap with non-circular magnetic surfaces cross-section with presence of axisymmetric magnetic field perturbations. Analytical model of magnetic field axisymmetric part and direct drift losses was improved for that magnetic configuration. High-energy particles resonant interaction with ripple magnetic field was investigated taking into account complete orbit. It was shown that the stochastic transport boundary has less contribution in the case of taking into account complete orbit compared to drift approximation.

Hall thruster reversible magnetic focusing system efficiency was increased. Experimental beam current density compression coefficient 95 was obtained. Focused ion beam impurities mass-separation conditions were considered. Light ions (H, He) are well-concentrated in the central part of the beam with Æ 3 mm. Impurity ions form the circle with the diameter ≥6mm in the light ions beam crossover. Light ions fluxes 1.5×1022 m-2s-1and heat flux 5 MW×m-2 with the fluence 7×1026m-2were obtained from Hall thruster. Focused beam charge and current compensation were investigated. Hall thruster with ballistic and reverse magnetic focusing system application for fusion-oriented material research is demonstrated. Developed focused ion source application is investigated for high-precise processing and nonuniformity control of microelectronics thin films.

Formation conditions of the spontaneously directed radiation in the extreme ultraviolet range in the form of short (~ 0.1 µs) power (~ 1 MW) pulses from the dense (n ~ 1016 cм-3) plasma of the multiply ionized tin atoms have been obtained. The directional radiation formation has been observed in dense plasma on the background of fast energy inputting due to formation the double layer of volume charges in the current channel. Based on the original method it has been found that the radiation directivity depends on the form of dense plasma. Based on the stimulated emission theory a physical model of directional radiation formation in dense plasma of pulsed diode has been proposed. Power management methods and radiation directivity have been determined.

It has been theoretically shown that the application of directional radiation sources can significantly increase the efficiency of theEUV radiation source systems for the nanolithography, the high-energy band microscopy, the medicine, the astrophysics, etc.

Young scientists group published 161 scientific papers. 53 papers are from the Scopus base. 39 papers have nonzero impact-factor.