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Analysis of Toroidal Alfven Eigenmode-Induced Fast Ion Losses in Globus-M2 Spherical Tokamak

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Abstract

With an increase of magnetic field up to 0.8 T and plasma current to 400 kA, fast ion losses rate in the discharges with toroidal Alfven eigenmodes decreased in tokamak Globus-M2 comparing with Globus-M tokamak discharges. Taking into account the data on the discharges with increased magnetic field and plasma current, the regression fit of neutral particle analyzer flux drop in energy channel close to neutral beam energy on relative eigenmode magnitude, the value of magnetic field and plasma current was analyzed. The power of flux drop dependence on TAE magnitude was found to be ~0.5 and inverse proportional on the value of product of magnetic field and plasma current, which is highly likely is determined only by plasma current due to weak dependence on magnetic field. The result obtained indicates that fast ion losses in Globus-M2, stimulated by toroidal Alfven eigenmodes are mostly determined by the shift of passing orbits to the plasma edge. With the increase of plasma current and magnetic field, neutron flux drops arising in the moments of toroidal mode bursts have also decreased.

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Funding

Measurements of fast ion losses in Section 2 were provided with financial support of Russian Science Foundation (project 17-12-01177-P). The neutron flux measurements, reviewed in Section 3 was performed with financial support of Ministry of science and higher education of Russian Federation in scope of state task in science 0034-2021-0001. Measurements of basic plasma parameters 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) at the Ioffe Institute.

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  1. Ioffe Institute, 194021, St. Petersburg, Russia

    I. M. Balachenkov, N. N. Bakharev, V. I. Varfolomeev, V. K. Gusev, M. V. Ilyasiva, G. S. Kurskiev, V. B. Minaev, M. I. Patrov, Yu. V. Petrov, N. V. Sakharov, O. M. Skrekel, A. Yu. Telnova, E. M. Khilkevich, A. E. Shevelev & P. B. Shchegolev

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  1. I. M. Balachenkov
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  2. N. N. Bakharev
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Correspondence to I. M. Balachenkov.

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Balachenkov, I.M., Bakharev, N.N., Varfolomeev, V.I. et al. Analysis of Toroidal Alfven Eigenmode-Induced Fast Ion Losses in Globus-M2 Spherical Tokamak. Tech. Phys. 68, 436–442 (2023). https://doi.org/10.1134/S106378422390022X

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