Multiscale kinetics of material excitation by swift heavy ions

In the talk a theoretical approach describing multiscale kinetics of excitation and relaxation of materials around trajectories of swift heavy ions decelerated in the electronic stopping regime will be presented. A quantitative model describing SHI-induced processes is based on the original Monte-Carlo TREKIS code [1], which uses no fitting parameters for simulating electron kinetics and electron-lattice coupling in SHI tracks. This stage includes modeling of SHI impact, creation and transport of delta-electrons, electron cascades and propagation of secondary electrons, Auger and radiative decays of core holes. It forms initial conditions for further ab-initio simulations, molecular dynamics model [2], as well as for a unique developed model of chemical activation and etching of tracks [3]. Results of successful applications of the multiscale approach to different materials irradiated with SHIs will be demonstrated. Possible non-additive effects resulting from characteristic scales of SHI tracks kinetics on material excitation under high-intensity SHI beams planned at FAIR facility and application of presented multiscale approach to description of these effects will be discussed. [1] N.A. Medvedev, R.A. Rymzhanov, A.E. Volkov, J. Phys. D. Appl. Phys. 48 (2015) 355303. [2] R.A. Rymzhanov, N. Medvedev, A.E. Volkov, J.H. O’Connell, V.A. Skuratov, Nucl. Instruments Methods Phys. Res. Sect. B Beam Interact. with Mater. Atoms. 435 (2018) 121–125. [3] S.A. Gorbunov, A.I. Malakhov, R.A. Rymzhanov, A.E. Volkov, J. Phys. D. Appl. Phys. 50 (2017) 395306.