96 kN-sec endurance test of the R-200 low power hall thruster

Abstract The R-200 low power Hall thruster unit completed a 96 kNs endurance test, during which the anode mass flow rate was adjusted to maintain constant of 250 W throughout campaign. test performed at Rafael, while initial performance validation conducted ESTEC. At end exhibited nearly unchanged and did not reach its end-of-life. During characterized 5 times in 100–250 discharge range, ceramic channel profile measured 6 assess erosion rate, thrust continuously tracked multiple day, an ignition after 60 continuous operation impact on capability, sensitivity magnetic field changes checked twice (at 12 65 kNs). Two notable events occurred – cathode keeper breach breach. electrode replaced, position adjusted. following continued operate regularly, with no degradation, even inner pole exposed plasma discharge. generated 13 mN entire Isp decreased from 1,250 s beginning life 1,160 test. Performance degradation less than 10% all operating points range experiment. validated 300 successful cycles. Using geometry data, simple semi-empirical model calibrated predict future breaching allow for improved design. information gathered this campaign used redesign profile. A subsequent design showed expected lifetime over 200 kNs.