We report basic characteristics of a cold supersonic
argon arc-jet plasma accelerated along open-field-line. The arc
jet is generated by arc discharge, and ejected through an anodenozzle
into a rarefied gas wind tunnel with a uniform longitudinal
magnetic field. The plasma further expands at the end of magnets,
which we refer to as a magnetic-nozzle, where we examine
variation in plasma parameters using a para–perp type Mach
probe and a four-tip type Mach probe. Our experiments show
that plasma potential drops at the magnetic-nozzle area and that
the ion flow velocity increases up to about Mach 3, followed by
deceleration into subsonic transition. To discuss the mechanism
of acceleration and deceleration, we assume a 1-D quasi-neutral
flow, and constructed a model to describe the deceleration
because of friction between ions and neutral particles at the
end of electromagnets, where charged particles are accelerated
but neutrals are not. We find reasonable agreement of the
experimental results with our modeling of the acceleration and
deceleration, although a few issues are left for us to improve.
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