Agilent engineers may heat the flight tube with a jacket at installation. This improves the initial pump down times on Agilent TOF and QTOF systems, especially in humid environments. After installation the jacket is removed.
The INVAR material does have a low thermal coefficient of expansion and in addition to that, the flight tubes also insulated by a vacuum sleeve. This acts like a thermos flask and insulates the flight tube from a lot of lab temperature fluctuations. With these two things combined, there is little need to heat the flight tube above ambient temperature for normal operation.
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I wanted to clarify something that you mentioned in the question. The comment about heating to 40oC is that the high voltage power supply electronics are heated to 40oC separate from the flight tube.
That is where the 40oC comes into function on the TOF and QTOF product line.
David A. Weil, Ph.D.
Senior Applications Scientist Agilent Technologies