Abstract
A test apparatus has been developed for studying the ineffectiveness of thermal regenerators as an essential part of the present new regenerator materials research and development program. Magnetic materials Er3Ni and Er0.5Dy0.5Ni2 are used as regenerator materials to make a comparison with lead between 4 and 35 K. In the apparatus, the helium gas flow through test regenerators can be switched to an alternate cold (or hot) flow in step-function fashion. The flow rate has been changed from 0.98 to 2.46 g/s and the switching time of the flow has been changed from 1 to 5 s. The details of the apparatus are described in the present paper. The ineffectiveness measurements show that the regenerator efficiencies are considerably high for Er3Ni and Er0.5Dy0.5Ni2 and the magnetic materials are more suitable for regenerator materials than lead below 15 K.
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