Thrust measurement experiments and planned Particle-in-Cell simulations for an electrodeless Magnetic Reconnection Thruster (e-MRT)

Advanced thrusters featuring large thrust-to-power, at sufficient specific impulse, and with long lifetime and flexibility in propellant are needed for deep space missions. To address these needs, we are exploring a new electrodeless Magnetic Reconnection Thruster (e-MRT), which will use asymmetric, partially ionized, inductively-driven reconnection outflows for net thrust. As a first step, we have built a diagnostic to measure the thrust density from reconnection outflows on the Magnetic Reconnection Experiment (MRX). The diagnostic consists of a confocal optical sensor to measure the physical displacement of a horizontal flexing arm, which will flex after impact of an outflow. Once calibrated and installed on MRX, experimental scans, varying control knobs such as neutral gas pressure, will be performed. In parallel, we have begun running VPIC simulations of an e-MRT-like geometry. These simulations will investigate the influence of neutral particles on the reconnection dynamics and test symmetry-breaking of outflow via locally strong magnetic pressure. Partial ionization may increase efficiency while maintaining high thrust via neutral-ion coupling. Preliminary results show that magnetic pressure provided by an additional coil can break outflow symmetry.