Time-of-flight mass analysers

A multi-reflection time-of-flight mass analyser comprising:

• a first ion-optical mirror comprising a first electrode, the first electrode having a shift in m/z ratio per Kelvin,
• a second ion-optical mirror comprising a second electrode, the second electrode having a shift in m/z ratio per Kelvin, wherein the second ion-optical mirror is spaced apart from the first ion-optical mirror at a distance defining a portion of an ion-flight path therebetween;
• a connector connected to the first electrode at a first connection point and connected to the second electrode at a second connection point, wherein the connector has a shift in m/z ratio per Kelvin, the connector defining a first length between the first and second connection points at a reference temperature;
• wherein the first length, the positions of the first and second connection points and the material of the connector are selected to compensate for the sum of the shift in m/z ratio per Kelvin in the electrodes of the first and second ion-optical mirrors and
• a vacuum chamber comprising an inner surface thermally coupled to the first electrode, the second electrode, or a combination thereof, wherein the inner surface and the first electrode, the second electrode, or a combination hereof are thermally coupled to the vacuum chamber by one or more flexible thermal conductors.