The End-Hall Thruster on display.
Tested at PEPL
NASA LeRC (now GRC)
The 500-W end-Hall thruster, developed at NASA Lewis Research Center (now GRC) was studied at PEPL as an alternative to the closed-drift thruster (CDT) that gained popularity due Russian research showing excellent CDT performance. This thruster does not have a center pole , thus eliminating an entire surface that can be eroded away. However, efficiency was found to be lower than similar CDT devices.
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.