Implementation of direct battery driven discharge in triggerless operation of vacuum arc thrusters

The increasing demand for CubeSat missions with limited budgets and constrained timelines necessitates the development of innovative propulsion systems. This paper focuses on vacuum arc thrusters (VATs) and investigates the implementation of battery-driven discharge for triggerless firing. VATs offer a promising alternative for CubeSat propulsion, generating thrust through the pulsed ejection of plasma in a cathode arc discharge. The study explores the feasibility of direct battery-driven discharge in VATs and demonstrates stable and variable-duration pulses. Experimental testing using high C-rating lithium-ion (Li-ion) batteries showcase the advantages and operational benefits of this approach. The results highlight the potential for variable energy pulses, precise control of thrust impulse bit, and improved performance compared to capacitor-driven systems. Future research directions include optimising pulse duration for enhanced lifetime, plume analysis, and erosion rate investigations. The implementation of VATs with battery-driven discharge presents a promising solution to enhance the performance and reliability of CubeSat propulsion systems while ensuring compliance with space sustainability guidelines.