J A Turner et al 1962 J. Sci. Instrum. 39 26 doi:10.1088/0950-7671/39/1/316
J A Turner, R M Pickard and G R Hoffman
Show affiliationsA conventional vacuum system has been modified to enable an ultra-high vacuum to be obtained in a large volume. A liquid nitrogen trap, situated part way up a tall glass vacuum vessel, isolates the working space from the rest of the system. Thus, the trap and the working space being seal free may be baked at 425° C. The rest of the system uses demountable indium metal seals and is exhausted by a 9 in. oil diffusion pump with a refrigerated chevron baffle. Baking the vacuum vessel enables a pressure of 1.5 × 10-8 torr to be obtained rapidly. With liquid nitrogen circulating and titanium getters fired, an ultimate of 1.5 × 10-9 torr is readily achieved.
Issue 1 (January 1962)
Received 11 July 1961
J A Turner et al 1962 J. Sci. Instrum. 39 26
M Fraser 1962 J. Sci. Instrum. 39 227
K R May 1945 J. Sci. Instrum. 22 187
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