The diameter of channel 34 of magnet 36 should increase with length, as shown in FIG 1, so as to have {HEAD ~ the radius} of {TAIL ~ the poles} always equal to the off axis displacement of the outermost molecules to be focused 
of
The diameter of channel 34 of magnet 36 should increase with length , as shown in FIG 1 , so as to have { HEAD ~ the radius } of { TAIL ~ the poles } always equal to the off axis displacement of the outermost molecules to be focused
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH