Magnetic-Field Fluctuations in the Startup Plasma
of the AMBAL-M Device

T. D. Akhmetov, V. I. Davydenko, A. A. Kabantsev, V. B. Reva,
V. G. Sokolov, and S. Yu. Taskaev

Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences,
pr. akademika Lavrent’eva 11, Novosibirsk, 630090 Russia

Received September 22, 1997

Abstract— Fluctuations of the azimuthal and radial magnetic field in the startup plasma of the end system of
the AMBAL-M tandem mirror system are measured by magnetic probes. An analysis of the spectra and radial
profiles of the magnetic-field and density fluctuations shows that there is a correlation between these quantities,
which can be explained in terms of the Kelvin–Helmholtz instability in a plasma stream flowing out of the gas-
discharge source. The characteristic parameters of the stream inhomogeneities are estimated. The radial profile
of the particle flux is determined from simultaneous measurements of the plasma density and radial magnetic
field. The diffusion coefficient related to magnetic-field fluctuations is estimated.

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