First Observations of Alfvén Cascades on the Globus-M2 Tokamak and Their Application for Minimal Safety Factor Value Analysis

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 i...

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Bibliographic Details
Published in:Technical physics letters 2020-12, Vol.46 (12), p.1157-1161
Main Authors: 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
Format: Article
Language:English
Subjects:
Beam injection
Cascades
Classical and Continuum Physics
Magnetic fields
Magnetic probes
Neutral beams
Oscillations
Physics
Physics and Astronomy
Reflectometers
Safety factors
Tokamak devices
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Summary: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.
ISSN:1063-7850
1090-6533
DOI:10.1134/S1063785020120032