Patent ID: 9349579
Filing Date: 2016-05-24
CPC Classification: H01J

Claim Text:
1. An ion detector for a mass analyzer in which ions are caused to form ion packets that oscillate with a period, the ion detector comprising: a detection arrangement, comprising: a plurality of detection electrodes configured to detect a plurality of image current signals from ions in the mass analyzer; and a preamplifier, wherein the preamplifier is arranged to provide an output signal based on the plurality of detected image current signals, the output signal having a signal-to-noise ratio; and compensation circuitry, arranged to provide at least one compensation signal, each compensation signal being provided to a respective compensatory part of the detection arrangement and being based on one or more of the plurality of detected image current signals; and wherein there is a capacitance between each of the compensatory parts of the detection arrangement and a respective signal-carrying part of the detection arrangement, affecting the signal-to-noise ratio of the preamplifier output signal.