The BPT-4000 operating.
Tested at PEPL
In 1998 the Aerojet BPT-4000 4.5-kW Hall thruster was briefly tested at PEPL. It went on to demonstrate both great performance and lifetime for commercial satellite applications. Work at PEPL included early performance evaluation and plume characterization to help space qualify this design.
The H9 Magnetically Shielded Hall Thruster
Hofer, R.R., Cusson, S.E., Lobbia, R.B., and Gallimore, A.D.
Performance of the H9 Magnetically Shielded Hall Thrusters
Cusson, S. E., Hofer, R. R., Lobbia, R. B., Jorns, B. A., and Gallimore, A. D.