G. Fiksel, D. J. Den Hartog, P. Fontana
University of Wisconsin - Madison
Department of Physics
A device for local sampling of plasma radiation is described. The radiation
is observed with two fused silica bundles with the lines of views crossing
at 90°. Each line of view is terminated by a view dump, thus
achieving the locality. The spatial resolution is about 5cm. The device
is arranged in the form of an insertable probe protected from the plasma
by a Boron Nitride enclosure, therefore the radial profiles can be measured.
The plasma velocity is deduced by the red and blue Doppler shifts of the
corresponding radiation spectra. All three components of the velocity -
radial, poloidal, and toroidal can be measured. The range of the probe
applications includes the studies of fluctuation driven transport, the
RFP dynamo, and ion viscosity. Initial velocity measurements in MST using
the He II 468.6 nm line are presented.
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