Abstract
Neutral beam injection into the Globus-M spherical tokamak at the early stage of discharge leads to the development of instabilities in a frequency range of 50–200 kHz, which have been identified as toroidal Alfvén eigenmodes (TAEs) [1]. The influence of these modes on the confinement of fast particles has been studied with the aid of a neutral particle analyzer (NPA) and a neutron detector. The isotope effect was studied using hydrogen and deuterium both in the injected beam and in the target plasma. A correlation analysis of signals from magnetic probes showed that the observed modes in most cases contain a single harmonic with toroidal number n = 1. Upon the injection of deuterium into deuterium plasma, the development of TAEs led to a decrease in the neutron flux by 25%, whereas the fluxes of high-energy recharge atoms decreased by 75%. After the injection of hydrogen, a decrease in the flux measured by NPA did not exceed 25%.
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Original Russian Text © Yu.V. Petrov, N.N. Bakharev, V.K. Gusev, V.B. Minaev, V.A. Kornev, A.D. Mel’nik, M.I. Patrov, N.V. Sakharov, S.Yu. Tolstyakov, G.S. Kurskiev, F.V. Chernyshev, P.B. Shchegolev, 2014, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2014, Vol. 40, No. 24, pp. 99–106.
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Petrov, Y.V., Bakharev, N.N., Gusev, V.K. et al. The influence of toroidal Alfvén modes on the confinement of fast particles in the Globus-M spherical tokamak. Tech. Phys. Lett. 40, 1136–1139 (2014). https://doi.org/10.1134/S1063785014120323
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DOI: https://doi.org/10.1134/S1063785014120323