|
 This
is 52-85GHz Heterodyne Sweeping ECE Radiometer for plasma
temperature measurements on TCV BR Tokamak (Brazil). This
project took a half year for completion, from developing stage
to ready-to-ship unit. The principal distinctive features
of 52-85GHz Radiometer are highly sensitive receiver and wideband
BWO sweep generator, plus low cost of the equipment.
The
plasma temperature measurement theory is based on a fact that
the intensity of the ECE (Electron Cyclotron Emission) is
proportional to the electron plasma temperature in situations
when the plasma may be considered as the black body for its
own cyclotron radiation. So the magnetized plasma electrons
emit electromagnetic energy at electron cyclotron frequencies
with intensity proportional to the plasma temperature. As
there is toroidal magnetic field gradient in the tokamak plasma,
electrons at different points along the major radius of the
torus radiate at different frequencies. So the radial electron
temperature distribution can be measured by scanning the frequency,
received by the radiometer.
The
shipment set for 52-85GHz Radiometer includes along with oversized
waveguides and accessories a special antenna with spherical
dielectric lens. This antenna was specially designed by ELVA-1
for making precise plasma temperature measurement through
TCV BR Tokamak vacuum window.
Fig.2.
52-85GHz Radiometer antenna
|
