Patent ID: 11222777

Abstract:
Disclosed herein is an ion guide for guiding an ion beam along an ion path, said ion guide having a longitudinal axis corresponding to said ion path, said ion guide-comprising a plurality of elongate electrodes arranged around and extending along said longitudinal axis wherein an inner envelope of the plurality of electrodes defines an ion guide volume. Said elongate electrodes are formed by electrode wires, wherein adjacent electrode wires are arranged at an inter-wire distance. The ion guide comprises holding structures for supporting and for straightening the electrode wires by applying a tension or maintaining a tension applied to them. Any portion of said holding structures which is separated from said ion guide volume by less than the local inter-wire distance is made from a material having a resistivity of less than 1012 Ohm·cm, preferably of less than 109 Ohm·cm, or has a sheet resistivity of less than 1014 Ohm, preferably of less than 1010 Ohm on a surface facing said ion guide volume.