Mass spectrometer

A method of assembling a mass spectrometer, the method comprising:

• providing an ion optics device housing having one or more external electrical connectors provided thereon, wherein the one or more external electrical connectors provided on the ion optics device housing are provided on one or more interface printed circuit boards (PCBs) provided on the ion optics device housing, and the one or more interface PCBs cover one or more apertures in the ion optics device housing that lead to one or more vacuum chambers in the ion optics device housing, such that the one or more interface PCBs form a part of a wall of the one or more vacuum chambers in the ion optics device housing;
• providing an ion optics device arranged inside the ion optics device housing, the ion optics device comprising one or more electrodes for manipulating ions, the one or more electrodes being electrically connected to the one or more external electrical connectors provided on the ion optics device housing wherein the ion optics device further comprises first and second ion optics printed circuit boards (PCBs), wherein the one or more electrodes are provided between and mounted to the first and second ion optics PCBs;
• providing a voltage supply housing having one or more external electrical connectors provided thereon on the outside of the voltage supply housing;
• and
• providing one or more voltage supplies arranged inside the voltage supply housing, the one or more voltage supplies being in electrical communication with the one or more external electrical connectors provided on the outside of the voltage supply housing;
• wherein the one or more external electrical connectors provided on the voltage supply housing are directly physically and electrically connected to the one or more external electrical connectors provided on the ion optics device housing.