Search academic texts

Information × Registration Number 0223U002034, (0120U101160) , R & D reports Title Phenomena associated with energetic ions in tokamaks and stellarators popup.stage_title Моделювання та прогнозні обчислення явищ з енергійними йонами. Написання підсумкового звіту Head Kolesnychenko Yaroslav I., Доктор фізико-математичних наук Registration Date 07-02-2023 Organization Institute of Nuclear Research of the National Academy of Sciences of Ukraine popup.description1 The study of phenomena associated with energetic (suprathermal) ions in the plasma of tokamaks and stellarators popup.description2 .It is shown that the spatial channeling of energy and momentum can affect the properties of Alfvén eigenmodes, and not only the balance of energy and plasma rotation. In particular, it can create modes with a radially dependent phase, that is, waves with a radially curved front. This suggests that spatial channeling is responsible for the named phenomenon known from experiments on the DIII-D and NSTX tokamaks and which has not had a satisfactory explanation. New properties of energy distributions of ions formed during pulse injection of neutral atom beams have been revealed. In particular, it was found that the distributions can take the form of solitons moving in the velocity space. These injected ions excite high-frequency fast magnetoacoustic modes, which are responsible for ion cyclotron emission not only from the periphery of the plasma, but also from its near-axial region. These results were published in the leading specialist journal Nuclear Fusion. Product Description popup.authors Burdo Oleh S. Lepyavko Bohdan S. Lutsenko Vadym V. Marchenko Viktor S. Reznyk Sviatoslav M. Rudenko Tymofii S. Tykhyy Anton V. Tyshchenko Marharyta H. Yakovenko Yurii V. popup.nrat_date 2023-02-07 Close