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Michael Morag edited Experimental Setup.tex
about 10 years ago
Commit id: 25f9c8a7b8d81194202ddf9abe86aa4e792dcad0
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\section{Experimental Setup}
The plasma was created by an inductively coupled
rf RF source operating at a power of 120W with $4\times 10^{-4}$ torr Argon as the working gas. A voltage sweep was put across a langmuir probe 70cm from the RF source 1.3ms into the afterglow and over a 101 $\mu s$ range. A magnetic field was applied to the device through the use of two sets of four coaxial magnets created through the use of 25.4A and 63.0A currents laid out around the device as shown in \textbf{figure 1} and resulting in a radially symmetric magnetic field through the device as measured in \textbf{table 1}, averaging to about 60G along the length. Whistler waves were generated in the plasma using a wave form generating antenna, set to 40MHz for the experiment with data taken in a plane and set to 9 separate varying frequencies from 40MHz to 120MHz, each 10MHz apart. A B-dot probe using the hall effect was used to measure the oscillations in the magnetic field due to the wave over a range of 70-90cm from the RF source axially and -15 degrees to 15 degrees radially for the set taken in a plane and varying axial lengths for the linear data set such that 10 data points were taken per wavelength of the measured wave.