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Continuous flow apparatus for preparing isotopically pure He-4

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>03/1987
Issue number3
Number of pages8
Pages (from-to)131-138
<mark>Original language</mark>English


A He-4 isotopic purification cryostat has been developed, capable of sustained operation in continuous flow. Starting from a feedstock of helium of the natural isotopic ratio, He-3/He-4 = X3 = 10^-7, it yields a purified product for which X3 < 5 X 10^-13 at a production rate of 3.3 STP m3/h. The isotopically purified He-4 is being used for a variety of applications, including quantum evaporation experiments, studies of ion motion at the He II/vacuum interface, down scattering and containment of ultra-cold neutrons, and investigations of the breakdown of superfluidity in He-4.