학술논문
First Observations of Alfvén Cascades on the Globus-M2 Tokamak and Their Application for Minimal Safety Factor Value Analysis.
Document Type
Article
Author
Balachenkov, I. M.; Petrov, Yu. V.; Gusev, V. K.; Bakharev, N. N.; Bulanin, V. V.; Varfolomeev, V. I.; Zhil'tsov, N. S.; Kiselev, E. O.; Kurskiev, G. S.; Minaev, V. B.; Patrov, M. I.; Petrov, A. V.; Ponomarenko, A. M.; Sakharov, N. V.; Tel'nova, A. Yu.; Tokarev, V. A.; Khromov, N. A.; Shchegolev, P. B.; Yashin, A. Yu.
Source
Subject
*SAFETY factor in engineering
*FACTOR analysis
*NEUTRAL beams
*MAGNETIC fields
*REFLECTOMETER
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Language
ISSN
1063-7850
Abstract
On the spherical tokamak Globus-M2 in discharges with toroidal magnetic field of 0.7 T by means of magnetic probes and a number of other diagnostics during neutral beam injection at the current ramp up stage, magnetic field oscillations in the range of 100–300 kHz having their frequency increasing in time, had been observed. Eigenmodes with wavenumbers n = 1–3 and m = 2–4 were being registered. These oscillations were identified as Alfvén cascades. By means of multi-channel fluctuation reflectometer, observed eigenmodes were found to be localized near the magnetic shear reversal radius. Application of MHD-spectroscopy technique allowed us to determine safety factor temporal evolution and experimental values are in well agreement with modelling results, provided by ASTRA transport code. [ABSTRACT FROM AUTHOR]