Search academic texts

Information × Registration Number 0121U110703, R & D request Title Processes associated with superthermal ions in tokamaks and stellarators Head Kolesnychenko Yaroslav І., Доктор фізико-математичних наук Registration Date 22-04-2021 Organization Institute of Nuclear Research of the National Academy of Sciences of Ukraine popup.description1 The aim of the proposed work is development of а theory of fusion plasmas, interpretation of experiments, predictive calculations, search of ways to improve plasma performance in fusion devices. Specific tasks of the work are as follows: (i) To find amplitudes of the electromagnetic field and fraction of the energy lost by superthermal ions in nonlinear stage of instabilities driven by Fast Magnetoacoustic Modes (FMM) with frequencies above the ion gyrofrequency; (ii) To study structure of high-frequency FMM and their destabilization by superthermal ions; (iii) To clarify the influence of the Spatial Channeling (SC) of the energy and momentum of fast ions on the structure of MHD modes and the energy transfer across the magnetic field by these modes; (iv) To understand reasons of sharp changes of the frequency of MHD-activity in plasmas with high fraction of energetic ions in hybrid discharges of tokamaks; (v) To identify mechanism of mitigation of turbulent heat fluxes by fast ions, which was observed in both numerical and real experiments; (vi) To develop a numerical code for calculation of the 4-D evolution of the fast-ion distribution function in the presence of sawtooth perturbations. (vii) To investigate possibility to improve plasma performance in specific fusion devices by employing collective processes. popup.nrat_date 2024-12-09 Close