In one embodiment, target material is brought into {HEAD ~ range} of {TAIL ~ the internal high gradient region} by gravity 
of
In one embodiment , target material is brought into { HEAD ~ range } of { TAIL ~ the internal high gradient region } by gravity
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH