Patent ID: 8927940
Filing Date: 2015-01-06
Classification: H01J

Abstract:
1. An abridged multipole structure for the transport, selection and trapping of ions along a central axis in a vacuum system, comprising: a first plurality of rectilinear electrode structures each comprising a plurality of electrodes arranged along a line, each structure having a substantially planar face with a first dimension and a second dimension perpendicular to the first dimension and being constructed so that a voltage applied across the second dimension produces an electrical potential at the planar face whose amplitude is a linear function of position along the second dimension; a mechanism that positions the first plurality of rectilinear electrode structures so that, for each electrode structure, the first dimension extends along the central axis and the planar faces of the electrode structures are positioned about the central axis; a source that applies an RF potential across the second dimension of each of the electrode structures to produce a multipole field to focus analyte ions toward the central axis; and a pair of trapping electrodes extending perpendicularly to the central axis and positioned before and after the first plurality of electrode structures along the central axis.