Chris Spencer edited Experimental Setup.tex  about 10 years ago

Commit id: 14d3918806169cfc54973924932fb2adb94d9c0b

deletions | additions      

       

\section{Experimental Setup}  The plasma was created by an inductively coupled RF source operating at a power of 215 W with Helium as the working gas.A voltage sweep was put across a langmuir probe 70 cm from the RF source 10 ms into the afterglow. A magnetic field was applied to the device through the use of two sets of four coaxial magnets created using 59.0 A and 24.5 A currents laid out around the device and resulting in a radially symmetric magnetic field through the device averaging to 63.5 Gauss along the axis.  Waves were generated in the plasma using a waveform generating antenna, in 5 frequencies ranging from 20Mhz to 120Mhz in 20Mhz steps. Measurements for 20Mhz data run began 5cm away from the closest point the probe is allowed to be to the source to the with 5 measurents taken in the z direction in 2 cm steps.Angular measurements were taken 21 times in 1.3$^\circ$ steps. The same measurements and acquisititons were made in z and in angle except 31 angle measurements were taken for each set of frequencies for the 40-100 Mhz data runs. The 120 Mhz data run was taken 15 cm away from the allowed distacne to the probe but instead 81 z measuremtns were taken at 0.37 steps and 51 angular measurements were take at 1.0$^\circ$ steps.Electric field is measured an electric dipole probe, shown as figure 1 1.