Fast Starting Hollow Cathodes for Sounding Rocket-based Tether Experiments
نویسندگان
چکیده
Data are presented on cathode temperature profiles, electron emission profiles under no-flow conditions, and timed starting tests with gas flow. Correlations between the temporal behavior of the noflow emission current and the starting time are made, and a model is presented of the barium/bariumoxide generation and surface diffusion processes that describe the electron emission profile and starting time behavior of a hollow cathode. Future tests for evaluating effects of fast conditioning/starting sequences are described. A stand alone test pallet containing all of the sub-systems required to quickly start and operate a hollow cathode has been built and is described. The test pallet is intended for use on a sounding rocket mission and its sub-systems include gas storage and delivery, power conditioning, transducers and sensors, and an embedded micro-controller.
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