Plasma Diagnostics Measurements on the Helicon Plasma Experiment (HPX)

The small Helicon Plasma Experiment (HPX) at the Coast Guard Academy Plasma Lab (CGAPL), continues to progress toward utilizing the reputed high densities (10¹³ cm^-3 and higher) at low pressure (.01 T) of helicons, for eventual high temperature and density diagnostic development in future laboratory investigations. HPX has installed an Impedans Langmuir probe and constructed an RF-shielded triple probe experimental diagnostic to compare the plasma's density, temperature, and behavior during experiments. Our 2.5 J YAG laser Thomson Scattering system operates at its first and second harmonic, 532 and 1064 nm respectively. It utilizes a high-performance volume-phase-holographic (VPH) grating spectrometer and a charge-coupled device (CCD) camera with a range of 380-1090 nm with a resolution of 1024x1024 for second harmonic (532 nm) photon emissions. At 1064 nm, a new polychromator has been procured from General Atomics optimized for TS measurements of 5 eV < T_e < 2000 eV over a 109-degree scattering angle. Preliminary observations from the Thomson Scattering, particle, and electromagnetic scattering diagnostics will be reported.