Longitudinal Current 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—In experimental studies of the startup plasma in the end system of the AMBAL-M device, it is found
that a longitudinal electron current of ~1 kA flows along the plasma stream during the plasma-source discharge.
The radial profiles of the current density in several cross sections are measured by a movable magnetic probe.
Near the plasma source, the current density profile is annular in shape, which is related to the geometry of the
discharge channel; as the distance from the source increases, the inner part of the plasma stream is gradually
filled with the current.

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