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\section{Experimental Setup}  The plasma was created by an inductively coupled RF source operating at a power of 210W with $5.5×10^{−3}$ torr Helium as the working gas. A voltage sweep was put across a langmuir probe 70cm from the RF source 0.1ms into the afterglow and with a rep rate of 5.1Hz. A magnetic field was applied to the device through the use of two sets of four coaxial magnets created using 59.0A and 24.5A currents laid out around the device as shown in figure 1 and resulting in a radially symmetric magnetic field through the device averaging to about 63.5G along the length. Whistler waves were generated in the plasma using a wave form generating antenna, set to 110MHz. To make a duct, a circular disc \textbf{X cm??} 5 cm  in diameter was installed 390mm distance from the source between the source and the whistler wave launch antenna. A antenna [2].This disc is biased to collect electrons and since it will be collecting electrons from the plasma in its area that is where there will be a density cavity [2].A  B-dot probe was used to measure the oscillations in the magnetic field due to the wave over a range of 4.8cm-\textbf{Xcm} from the RF source axially and \textbf{?-15 degrees to 15 degrees?} 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 is in the normal direction with respect to a magnetic field, a change in magnetic field will induce a voltage by faradays law.