Cox, WesleyHawkins, RhysCharles, ChristineBoswell, Roderick2015-12-070093-3813http://hdl.handle.net/1885/18342An investigation of the ion density produced inside the Chi Kung reactor at 250 W and 0.30 mtorr was performed through Langmuir probe measurements. Three-dimensional interpolation combined these data to produce a 3-D density volume. The resulting image was used to identify three distinct regions of differing density: power deposition, acceleration, and expansion. The ion density over these regions was found to vary from ∼1.3 × 1010 to ∼2.7 × 1011 cm-3.Keywords: Helicons; Ions; Plasma diagnostics; Plasmas; Density measurement; Double layers; Electric propulsion; Electron tubes; Helicon plasmas; Ion beam; Ion beams; Ion densities; Ion density measurements; Langmuir probe measurements; Plasma measurements; Plasma p Density measurement; Electric propulsion; Electron tubes; Ion beam; Ion beams; Ion density measurements; Plasma diagnostics; Plasma measurements; Plasma propulsion; Plasmas; Probes; Propulsion200810.1109/TPS.2008.9244292015-12-07