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Michael Morag edited Experimental Setup.tex
about 10 years ago
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\section{Experimental Setup}
The plasma was created by an inductively coupled RF source operating at a power of 210 W with 5.5×10\textsuperscript{−3} torr Helium as the working gas. A voltage sweep was put across a langmuir probe 70 cm from the RF source 0.1 ms into the afterglow and with a rep rate of 5.1
(\textbf{M?}) Hz. (\textbf{M?})Hz. A magnetic field was applied to the device through the use of two sets of four coaxial magnets created using
59.0A 59.0 A and
24.5A 24.5 A currents laid out around the device and resulting in a radially symmetric magnetic field through the device averaging to about
63.5G 63.5 Gauss along the length. Whistler waves were generated in the plasma using a wave form generating antenna, set to
110MHz. 110 MHz. To make a duct, a copper circular plate 5 cm in diameter was installed
390mm 39.0 cm (\textbf{That's almost half a meter. Maybe 3.9 cm?}) distance from the source between the source and the whistler wave launch antenna.
This The disc is biased to collect electrons. The plasma in turn will try to retain
quasi neutrality quasi-neutrality by parting the ions. This creates a density profile and "ducts" the
wave. [2].A wave[2]. A B-dot probe was used to measure the change in the magnetic field due to the wave over an axial range of 4.8 cm - 44.8 cm from the RF source and -45\textsuperscript{o} to 45\textsuperscript{o} radially. The B-dot probe used in this experiment consists of 6 faces of a wire of one loop in a cube orientation. When the loop of wire detects a change in magnetic flux, there will be an induced voltage by faradays law.