Ions are trapped in {HEAD ~ a potential well} in {TAIL ~ the linear trap} 30 and are bunched at the bottom of the potential well adjacent an exit segment 50 
in
Ions are trapped in { HEAD ~ a potential well } in { TAIL ~ the linear trap } 30 and are bunched at the bottom of the potential well adjacent an exit segment 50
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH