This article is cited in 11 papers

The influence of toroidal Alfvén modes on the confinement of fast particles in the Globus-M spherical tokamak

Yu. V. Petrov, N. N. Bakharev, V. K. Gusev, V. B. Minaev, V. A. Kornev, A. D. Melnik, M. I. Patrov, N. V. Sakharov, S. Yu. Tolstyakov, G. S. Kurskiev, F. V. Chernyshov, P. B. Shchegolev

Ioffe Institute, St. Petersburg

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%.

Received: 17.09.2014

 English version: Technical Physics Letters, 2014, 40:12, 1136–1139

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