A method for cooling items in a vacuum has two chambers attached to the cooling chamber containing refrigeration condensers and getters and which can be isolated

摘要

The cooling chamber (18) for items (12) has two sealed chambers (20) with valves (21) by which the getters (26) can maintain a vacuum created by a pump (22) through pipes (24,25) as refrigeration units (16) cool the main chamber and valves (21) are open. The getters may be separately regenerated by the heat from the condensers by closing the valves (21) without increasing the main chamber pressure.