Strong Focusing Ion Source for Mass Spectrometers

Abstract

An ion source has been developed, using strong‐focus principles, with a view toward obtaining high transmission through sector‐shaped magnetic fields. The lens described, starting with an ion beam 0.375 in. square, produces a line focus 0.60 in. long and 0.025 in. wide, with a half‐angle of divergence beyond the crossover of 0.034 rad.