title: Automatic 300-4 K temperature cycling apparatus.
abstract: The apparatus described here automatically cycles small samples between 300 and 4 K by alternately raising and lowering the sample through the neck of a commercial liquid helium storage Dewar. A bellows, which is pressurized by the helium boil-off gas, provides all of the required mechanical motion. By utilizing the cooling available from the boil-off gas, liquid helium helium consumption is limited to 0.03 l/cyc for a 12-g sample. Cycle times can be as short as 5 min.
authors.affiliation: National Bureau of Standards, Electromagnetics Division, Boulder, CO 80302, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Hamilton
mesh_terms: D003080:Cold Temperature; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006371:Helium / Q000737:chemistry*; D012034:Refrigeration / Q000295:instrumentation* / Q000379:methods; D012371:Robotics / Q000295:instrumentation*; D013048:Specimen Handling / Q000295:instrumentation*
chemical_list: D006371:Helium