9700-Hour Durability Test of a Five Centimeter Diameter Ion Thruster

S. NAKANISHI, R. C. FiNKE
1974 Journal of Spacecraft and Rockets  
A modified Hughes SIT-5 thruster has been life-tested at the Lewis Research Center. The final 2700 hours of the test are described with a charted history of thruster operating parameters and off-normal events. Performance and operating characteristics were nearly constant throughout the test except for neutralizer heater power requirements and accelerator drain current. A postshutdown inspection revealed sputter erosion of ion chamber components and component flaking of sputtered metal. Several
more » ... ered metal. Several flakes caused beamlet divergence and anomalous grid erosion, causing the test to be terminated. All sputter erosion sources have been identified and promising sputter resistant components are currently being evaluated.
doi:10.2514/3.62127 fatcat:tb3weukfsfeendiqb5qnbo2atu