magnetic poles placed at exit part of ion source and a magnetic pole in a center of a discharge channel in a form of {HEAD ~ protrusion} with a magnet or {TAIL ~ electromagnet} placed in a central magnetic pole 
with
magnetic poles placed at exit part of ion source and a magnetic pole in a center of a discharge channel in a form of { HEAD ~ protrusion } with a magnet or { TAIL ~ electromagnet } placed in a central magnetic pole
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH