Abstract
Abstract Microwave-driven Coaxial Transmission Line Resonator (μ-CTLR) produces a small-volume high density plasma plume. In the previous study, we discovered that the plasma generated by the μ-CTLR remains stable even at low pressure around tens of mTorr, while consuming minimal power below 10 W [K.T. Kim et al., PSST 31 (2022) 105006]. In this study, we have investigated the capability of the μ-CTLR plasma operating at 900 MHz for micro-propulsion applications. At the argon gas flow rate of 100 SCCM (3 mg/s) and the power of 8 W, the plasma plume attains high gas temperature (> 3000 K), high electron density (> 1020 m-3), and electron temperature of about 2 eV. The estimated thrust is about 4 mN, demonstrating that the μ-CTLR has high thrust desirable for space micro propulsion system, together with the other merits of low power consumption and small size.
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