Stability Analysis of Hollow Cathodes
Hollow cathodes are used as the electron source for Hall and ion thrusters, but also exhibit complicated dynamic behavior by themselves. The current carrying nature of the cathode plasma can generate instabilities that are believed to be fundamentally important to the operation of Hall thrusters. Other instabilities in the cathode plume can generate high energy ions causing erosion of the device which may limit the lifetime of a thruster. This project aims to improve our understanding of how instabilities in the hollow cathode may influence thruster performance and lifetime. To accomplish this goal, a combination of high-speed probes and imaging, as well as time-resolved laser diagnostics are used to measure wave properties.
Transition of a cathode from spot mode to plume mode.
An Experimental and Theoretical Study of Hollow Cathode Plume Mode Oscillations
Georgin, M.P., Jorns, B.A., Gallimore, A.D.
Simple Model for Cathode Coupling Voltage Versus Background Pressure in a Hall Thrusters
Cusson, S.E., Jorns, B.A., and Gallimore, A.D.
Passive High-speed Imaging of Ion Acoustic Turbulence in a Hollow Cathode
Georgin, M.P., Byrne, M.P., Ciaston, N.E., Jorns, B.A., and Gallimore, A.D
Low-current Hollow Cathode Evaluation
Domonkos, M.T., Gallimore, A.D., Williams, G.J., and Patterson, M.J.
Laser Induced Fluorescence Characterization of Ion Emitted from Hollow Cathodes
Williams, G.J., Smith, T.B., Domonkos, M.T., Shand, K.J., Gallimore, A.D., and Drake, R.P.