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

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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.

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Funding

The experiments were carried out on the Unique Scientific Facility Spherical Tokamak Globus-M, which is incorporated in the Federal Joint Research Center Material science and characterization in advanced technology (project ID RFMEFI62119X0021). Routine measurements of the basic plasma parameters were performed within the framework of the State task of the Ministry of Science and Higher Education of the Russian Federation. The reflectometry measurements for the spatial localization of Alfvén cascades, magnetic measurements, and safety factor calculation by ASTRA code were financially supported by Russian Science Foundation (grant 17-12-01177 extension).

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Authors and Affiliations

  1. Ioffe Physical Technical Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia

    I. M. Balachenkov, Yu. V. Petrov, V. K. Gusev, N. N. Bakharev, V. V. Bulanin, V. I. Varfolomeev, N. S. Zhil’tsov, E. O. Kiselev, G. S. Kurskiev, V. B. Minaev, M. I. Patrov, N. V. Sakharov, A. Yu. Tel’nova, V. A. Tokarev, N. A. Khromov, P. B. Shchegolev & A. Yu. Yashin

  2. Peter the Great St. Petersburg Polytechnic University, 195251, St. Petersburg, Russia

    I. M. Balachenkov, V. V. Bulanin, N. S. Zhil’tsov, E. O. Kiselev, A. V. Petrov, A. M. Ponomarenko & A. Yu. Yashin

Authors
  1. I. M. Balachenkov
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  2. Yu. V. Petrov
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  3. V. K. Gusev
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  4. N. N. Bakharev
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  5. V. V. Bulanin
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  6. V. I. Varfolomeev
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  7. N. S. Zhil’tsov
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  8. E. O. Kiselev
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  9. G. S. Kurskiev
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  10. V. B. Minaev
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  11. M. I. Patrov
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  12. A. V. Petrov
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  13. A. M. Ponomarenko
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  14. N. V. Sakharov
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  15. A. Yu. Tel’nova
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  16. V. A. Tokarev
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  17. N. A. Khromov
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  18. P. B. Shchegolev
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  19. A. Yu. Yashin
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Corresponding author

Correspondence to I. M. Balachenkov.

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The authors declare that they have no conflict of interest.

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Translated by E. Glushachenkova

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Balachenkov, I.M., Petrov, Y.V., Gusev, V.K. et al. First Observations of Alfvén Cascades on the Globus-M2 Tokamak and Their Application for Minimal Safety Factor Value Analysis. Tech. Phys. Lett. 46, 1157–1161 (2020). https://doi.org/10.1134/S1063785020120032

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