| Popis: |
An ionic liquid electrospray thruster was developed for application in micro-nano satellites or gravitational wave detectors. The thruster employed a porous ceramic emitter with 7 emitter strips located on its emission surface. Without any liquid-supply device, ionic liquid was delivered through porous media to the emitter strips via capillary effect. Multiple emission sites then formed at the tip of each strip. A charged beam of up to 350 μA (with a current density of 540 μA / cm2) was stably produced in the negative mode. However, in the positive mode, a corona was observed which could prevent the thruster from emitting larger current. A time-of-flight (TOF) mass spectrometer with significantly improved signal-to-noise ratio was built, which was used to obtain the mass distribution of the beam. A retarding potential analysis (RPA) was also performed. The test results showed that the thruster worked in the pure-ion regime, and delivered a maximum thrust of 67.1 μN and specific impulses of 3952 s and 3117 s in the positive and negative modes, respectively. |
