title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð°Ð»ÑÑÐ²ÐµÐ½Ð¾Ð²ÑÐºÐ¸Ñ Ð¼Ð¾Ð´ Ð½Ð° ÑÐ¾ÐºÐ°Ð¼Ð°ÐºÐµ ÐÐ»Ð¾Ð±ÑÑ-Ð2 Ð¼ÐµÑÐ¾Ð´Ð¾Ð¼ Ð´Ð¾Ð¿Ð¿Ð»ÐµÑÐ¾Ð²ÑÐºÐ¾Ð³Ð¾ Ð¾Ð±ÑÐ°ÑÐ½Ð¾Ð³Ð¾ ÑÐ°ÑÑÐµÑÐ½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: The study of Alfven modes on the Globus-M2 tokamak using Doppler backscattering
Creators: name: ÐÐ¾Ð½Ð¾Ð¼Ð°ÑÐµÐ½ÐºÐ¾, ÐÐ½Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÑÐ¾ÐºÐ°Ð¼Ð°Ðº
Ð°Ð»ÑÑÐ²ÐµÐ½Ð¾Ð²ÑÐºÐ°Ñ Ð¼Ð¾Ð´Ð°
Ð°Ð»ÑÑÐ²ÐµÐ½Ð¾Ð²ÑÐºÐ¸Ð¹ ÐºÐ°ÑÐºÐ°Ð´
Ð´Ð¾Ð¿Ð¿Ð»ÐµÑÐ¾Ð²ÑÐºÐ¾Ðµ Ð¾Ð±ÑÐ°ÑÐ½Ð¾Ðµ ÑÐ°ÑÑÐµÑÐ½Ð¸Ðµ
tokamak
Alfven mode
Alfven cascade
Doppler backscattering

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description: The aim of this work was to investigate Alfven modes on the spherical Globus-M2 tokamak using multichannel Doppler backscattering. The Doppler backscattering diagnostics set-up with probing frequencies ranging from 20 to 75 GHz was successfully installed, tested and used in experiments. Spectral processing software was developed for the analysis of DBS signals. The localization of Toroidal Alfven Eigenmodes (TAE) was determined, allowing for the selection of an adequate theoretical model describing the Alfven continuum. Information was obtained on the localization of TAE with increasing plasma current and toroidal magnetic field values. With the increased magnetic field and during NBI, TAEs with frequency satellites caused by the Doppler shift in frequency due to toroidal plasma rotation were detected and investigated. An estimate was made for the velocity of this rotation. Information was obtained about Alfven cascades that occurred when a magnetic field shear was temporarily formed in the plasma. The measurement of cascades is aimed at determining the localization of the minimum safety factor q. In general, the resulting data will be used to improve the theory of Alfven mode development. It is also possible to estimate the loss of fast ions during NBI due to the formation of Alfven modes.