Virkningsgraden for følgende elektrodeløs plasma-motor på 30%, blev opnået af Professor Kazunori Takahashi fra [[Tohoku University]] i 2022. Plasma-motoren anvender [[ioniseret]] [[argon]].<ref>[https://www.sciencedaily.com/releases/2022/11/221111103033.htm Tohoku University. (2022, November 11). Improving the performance of electrodeless plasma thrusters for space propulsion. ScienceDaily] Citat: "...Whilst mature electric propulsion devices often use xenon gas, which is expensive and difficult to supply in sufficient quantities, the current 30% efficiency was obtained with argon propellant. This indicates that a MN rf plasma thruster would reduce the cost and the resource load from the Earth. "Applying a cusp-type magnetic field inhibited the energy loss that generally occurs to the plasma source wall," Takahashi said. "The breakthrough opens the door to advances in high-power space transportation technology."..."</ref><ref>Open Access: [http://dx.doi.org/10.1038/s41598-022-22789-7 Kazunori Takahashi. Thirty percent conversion efficiency from radiofrequency power to thrust energy in a magnetic nozzle plasma thruster. Scientific Reports, 2022; 12 (1)]</ref>
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