Verlag des Forschungszentrums Jülich
JUEL-3426
Höthker, Klaus; Bieger, Wolfgang; van Goubergen, Herman
On the determination of the ion drift speed perpendicular to the magnetic field by means of a probe
32 S., 1997
In an attempt to determine the flow speed of ions
perpendicular to the magnetic field the effective area of the
probe pins has to be known. Its value depend on the value of
the electric field in the presheth of the pin and can be
significantly larger than the geometrical area. It is
demonstrated that without considering the effect of the
presheath even the determined direction of the flow can be
wrong. Probe signals obtained by means of the Rotating
Double Cylinder Probe give an indication of the importance of
the presheath effect in a plasma with cross field flow. A new
probe head design is presented which might be suited to
determine the cross field flow speed. First results are
discussed.
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