Abstract
The omegatron, a radio-frequency mass spectrometer, has been applied to the detection of very small leaks using the helium probe technique. Although intrinsically of similar sensitivity to the conventional magnetic sector mass spectrometer, its effective sensitivity can be very much increased by reducing the speed at which the leak and leak detector combination is pumped, an operation which is not feasible with the usual mass spectrometer. By this means leaks of 10-11 l. mb/s are readily found. The limiting sensitivity appears to lie in the 10-14 l. mb/s region. A simple omegatron constructed for leak detection is described, and precautions to be taken in the use of helium mentioned.
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