Design, Construction and Characterization of a Coaxial Plasma Gun for Torsional Magnetic Reconnection Propulsion

One of the most promising emerging technologies for high specific impulse space propulsion is the torsional magnetic reconnection (TSR) thruster. Such a system includes three main features: a spine-fan linear null magnetic topology, an azimuthal field, and a plasma source. This presentation covers the design, construction, and characterization of a coaxial plasma gun (CPG) operating in both snowplow and deflagration modes to serve as the azimuthal field and plasma source in a TSR thruster. A 1600 J capable DC pulse power system and a timed gas puff valve mass insertion system are constructed to operate the CPG. Current analysis and voltage values will be measured with the use of Pearson coils and high-voltage oscilloscope probes throughout the circuit to further elucidate the RLC type behavior of the CPG and pulsed circuitry. ICCD imagery will be taken of the plasma discharge in both pre-fed and gas puff operation. These will be compared with electron temperature and density measurements found with stark broadening optical emission spectroscopy. The measurements taken herein will contribute to a greater understanding of CPG operation necessary to maximize the azimuthal magnetic field. All experiments are conducted in a vacuum chamber operating at both low and high vacuum. The data gained herein will be of crucial importance when attempting to integrate the CPG into the larger null field structure to initiate torsional magnetic reconnection.