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SINGLE IMPULSE MEASUREMENT OF A COAXIAL PULSED PLASMA THRUSTER

Abstract Since pulsed plasma thrusters generate a very small impulse, so one cannot measure its magnitude easily. Recently, micro-thrusters were paid attention, and researches about a method of small impulse measurement have been increasing. It is important for thrusters operating pulsed mode to measure every impulse bit. In this study, we designed a torsion-type thrust stand which enables to measure a single shot impulse of our newly designed a coaxial pulsed plasma thruster. Our torsion type thrust stands are suspended from the chamber ceiling by a pair of wires or a C-section pipe for its rotation axis. We also analyzed the motion of the thrust stand to achieve the reasonable S-N ratio. Furthermore, we measured for comparison the impulse bit of our coaxial PPT using the target pendulum which is the conventional method of a small impulse measurement.