Patent ID: 6617578
Filing Date: 2003-09-09
Classification: H01J

Abstract:
An ion guide assembly comprising(a) 2N rods equidistantly spaced from a central axis and (b) at least one support collar for supporting said rods and for electrically connecting N alternate said rods, whereby each adjacent pair of rods are electrically unconnected, said collar comprising an insulating ring having first and second axially displaced grooves formed on the outer azimuthal periphery thereof, each said groove intercepting N radially directed holes therethrough, said radially directed holes each aligned with a rod conformal surface portion on the inner azimuthal periphery for locating corresponding said alternate rods, whereby said N holes of said first groove are azimuthally shifted by &pgr;/N with respect to the N holes of said second groove, and (c) an electrical conductor disposed in each said groove to contact a corresponding said rod through a respective said radially directed hole.