Test set-up and results of indigenous prototype 80 K helium purifier of He plant

A Helium refrigerator/liquefier, of refrigeration 1 kW at 4.5 K, being developed at IPR, will have in-built two He purifiers inside the cold box to remove impurities like N2, O2, Ar at ∼80 K and H2 & Ne at ∼20 K. A prototype He purifier adsorber bed for flow rate of 30 g/s has been designed and manufactured indigenously for operation at ∼80 K. To simulate the condition of operation of purifier inside the He plant a test facility has been developed indigenously, in which this prototype purifier will be tested. In this test facility, vacuum chamber is not used and certain insulations have been wrapped over the low temperature components to reduce the external heat load. Test result shows that even at high impurity inlet of 300 PPM (part per million), outlet impurity was 0 PPM. This report will give details of these.