Here are some preliminary tests of an anode layer ion source that I am working on.
Anode layer ion sources (http://www.plasmalab.ru/depos_ion.htm
) are simular to hall effect thrusters, except they don't require the neutralizer source.
My source is 1" long, 1.25" OD with a 0.75" molybdenum wire ring as the anode.
It uses an N40 rare earth magnet for the magnetic field.
Some of these sources can produce up to 30mA of ion emission per linear cm of emission area. (http://www.veeco.com/Products/process_equipment/Ion_Sources/Linear_Anode_Layer_Ion_Source/index.aspx?prodGroup=0
In the pictures below this source was being pumped down by a direct drive dual stage pump in good condition and was operated at about 1-2kV from a power supply with 5mA max output. More data will follow.