Patent ID: 9082602
Filing Date: 2015-07-14
Classification: H01J

Abstract:
1. A mass analyser for use in a mass spectrometer, the mass analyser having: a set of electrodes including electrodes arranged to form at least one electrostatic sector, the set of electrodes being spatially arranged to be capable of providing an electrostatic field in a reference plane suitable for guiding ions along a closed orbit in the reference plane, wherein the set of electrodes extend along a drift path that is locally orthogonal to the reference plane, wherein the drift path curves around a reference axis included in the reference plane, so that, in use, the set of electrodes provide a 3D electrostatic field region; wherein the mass analyser is configured so that, in use, the 3D electrostatic field region provided by the set of electrodes guides ions having different initial coordinates and velocities along a single predetermined 3D reference trajectory that curves around the reference axis.