P. P. Deichuli, A. A. Ivanov, and N. V. Stupishin
Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences,
pr. akademika Lavrent’eva 11, Novosibirsk, 630090 Russia
Received June 19, 1997; in final form, October 27, 1997
Abstract—Results of measurements of the potential profile along the axis of the expander of a gas-dynamic
trap are presented. The potential at a given point of the expander was measured by means of a local gas target.
The target was produced by a pulsed gas puffing through a glass capillary, whose position along the axis of the
confinement system was varied from shot to shot. Cold ions produced via charge exchange and ionization of
the particles of a gas cloud were accelerated by an ambipolar electric field. Their energy, which was measured
at the end wall by an electrostatic analyzer, corresponded to the potential at the point of charge exchange.
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