Abstract
Measurements have been made on a simple omegatron mass spectrometer, to show the effect of various parameters on the sensitivity, resonant frequency, resolution and background ion current. Increase of magnetic field has been shown to cause a marked improvement in peak-to- background ratio, and to improve resolution approximately as predicted by the simple theory. The range has been extended to include Hg, the height of Hg peaks having been shown to be proportional to the pressure of Hg vapour present. Using the results it has been possible to make a practical appraisal of the sensitivity of the omegatron as a leak detector. This leads to less optimistic sensitivity values than have been quoted on theoretical grounds.
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