Toroidal Alfvén Eigenmodes in Globus-M Spherical Tokamak Plasma
- Autores: Gusev V.1, Martynov A.2, Medvedev S.2, Petrov Y.1, Patrov M.1, Tel’nova A.1
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Afiliações:
- Ioffe Physical Technical Institute
- Keldysh Institute of Applied Mathematics
- Edição: Volume 44, Nº 1 (2018)
- Páginas: 67-69
- Seção: Regular Papers
- URL: https://journals.rcsi.science/1063-7850/article/view/207152
- DOI: https://doi.org/10.1134/S1063785018010133
- ID: 207152
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Resumo
Conditions of the excitation of toroidal Alfvén eigenmodes (TAEs) and their inf luence on the confinement of fast particles into the Globus-M spherical tokamak have been studied by KINX code calculations of the magnetohydrodynamic spectra of reconstructed divertor equilibrium configurations with stability margin q0 > 1 on the magnetic axis. The sensitivity of the frequencies of TAE modes with toroidal wavenumber n = 1 to the type of boundary conditions and choice of boundary surface has been studied. It has been established that the frequencies of modes with dominating poloidal harmonics m = 1 and 2 in the gap of continuum are significantly higher than those observed in the spectra of signals measured in the Mirnov coil probes, especially under the assumption of free plasma boundary with allowance for its compressibility. The TAE modes with lower frequencies and higher poloidal wavenumbers localized near the plasma boundary may be responsible for the oscillations observed in the experiment. However, these modes are characterized by the interaction with continuum and, probably, exhibit related damping.
Sobre autores
V. Gusev
Ioffe Physical Technical Institute
Email: yu.petrov@mail.ioffe.ru
Rússia, St. Petersburg, 194021
A. Martynov
Keldysh Institute of Applied Mathematics
Email: yu.petrov@mail.ioffe.ru
Rússia, Moscow, 125047
S. Medvedev
Keldysh Institute of Applied Mathematics
Email: yu.petrov@mail.ioffe.ru
Rússia, Moscow, 125047
Yu. Petrov
Ioffe Physical Technical Institute
Autor responsável pela correspondência
Email: yu.petrov@mail.ioffe.ru
Rússia, St. Petersburg, 194021
M. Patrov
Ioffe Physical Technical Institute
Email: yu.petrov@mail.ioffe.ru
Rússia, St. Petersburg, 194021
A. Tel’nova
Ioffe Physical Technical Institute
Email: yu.petrov@mail.ioffe.ru
Rússia, St. Petersburg, 194021