Patent ID: 8093554
Filing Date: 2012-01-10
Classification: H01J

Abstract:
1. A mass spectrometer comprising: an electrode arrangement for causing charged particles in a beam to undergo multiple changes of direction; a detection arrangement, arranged to detect a first portion of the charged particle beam that has travelled a first path length through the mass spectrometer, and to provide a first output based upon the intensity of the detected first portion of the charged particle beam, the detection arrangement further arranged to detect a second portion of the charged particle beam that has travelled a second path length through the mass spectrometer, the second path length being greater than the first path length, and to provide a second output based upon the detected second portion of the charged particle beam; and a controller, arranged to adjust the parameters of the charged particle beam, based upon the first output of the detection arrangement, so as to adjust the second output of the detection arrangement.