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This article is cited in 2 scientific papers (total in 2 papers)
Toroidal Alfvén eigenmodes in Globus-M spherical tokamak plasma
V. K. Guseva, A. A. Martynovb, S. Yu. Medvedevb, Yu. V. Petrova, M. I. Patrova, A. Yu. Telnovaa a Ioffe Institute, St. Petersburg
b Keldysh Institute of Applied Mathematics of Russian Academy of Sciences, Moscow
Abstract:
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 $q_0>1$ 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.
Received: 11.09.2017
Citation:
V. K. Gusev, A. A. Martynov, S. Yu. Medvedev, Yu. V. Petrov, M. I. Patrov, A. Yu. Telnova, “Toroidal Alfvén eigenmodes in Globus-M spherical tokamak plasma”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 44:2 (2018), 65–71; Tech. Phys. Lett., 44:1 (2018), 67–69
Linking options:
https://www.mathnet.ru/eng/pjtf5909 https://www.mathnet.ru/eng/pjtf/v44/i2/p65
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