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We have been testing di-methyl ether (DME) as liquid propellant for a coaxial type pulsed plasma thruster(PPT). Liquid-PPTs can set arbitrary amount of ejected propellant at arbitrary timing, avoiding “particulate-emission” and “late-time ablation,” whereas solid propellant PPTs cannot. In addition to this advantage, DME-PPT can be free from feeding pressurant with the help of DME’s expedient vapor pressure, and desirable operation has been shown with it so far. This time we conducted a study to investigate the effect of capacitance on the thrust performance with our prototyped DME-PPT. The result showed that impulse bits increased monotonically with capacitor-stored energy E. In higher range of E, impulse bits Ibit only in the case with capacitance C=3 μF is lower than with those the other Cs. The maximum Ibit and specific impulse Isp were 102 μNs and 575 s respectively at E=13 J and a mass shot ∆m=18.4 μg in the range conducted in this study.

Effect of Capacitance on the Performance of a Di-methyl Ether Pulsed Plasma Thruster