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Investigations of Alfvén Modes at the Globus-M2 Tokamak Using a V-Band Multifrequency Doppler Reflectometer

Abstract

We present new information on the development of Alfvén modes on the Globus-M2 spherical tokamak. Data have been obtained using a V-band Doppler reflectometer with probing radiation frequencies from 50 to 75 GHz. Аs a multifrequency source of probing radiation, a microwave harmonic synthesizer has been used. As a result of using the new reflectometer, the toroidal Alfvén mode localization in a magnetic field of 0.5 T has been obtained. The spectral components of the Alfvén mode with Doppler frequency shifts caused by toroidal plasma rotation have been registered. In the central regions of the discharge, so-called “Alfvén cascades” have been investigated.

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Funding

This work was supported by the Russian Science Foundation, project no. 17-12-01177-P.

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Correspondence to V. V. Bulanin.

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The authors declare that they have no conflict of interests.

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Translated by G. Dedkov

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Bulanin, V.V., Balachenkov, I.M., Varfolomeev, V.I. et al. Investigations of Alfvén Modes at the Globus-M2 Tokamak Using a V-Band Multifrequency Doppler Reflectometer. Tech. Phys. Lett. 47, 197–200 (2021). https://doi.org/10.1134/S1063785021020206

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Keywords:

  • plasma
  • tokamak
  • Alfén modes
  • Doppler backscattering.