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A thermal diffusivity measuring system employing a closed cycle helium refrigerator was developed, which also enabled the thermal conductivity measurement under an identical experimental setup. The diffusivity was measured by a discretional heating method and the conductivity was measured by a steady-state heat flow method. The errors and the accuracy in measurements were evaluated by measuring the diffusivities of an austenitic stainless steel standard sample (SRM 1460), a Pyrex glass (Corning #7740) and a high purity copper between 12 to 200K. The diffusivity ranging from 10-3 to 2cm2/s could be determined with an uncertainty of 3%. The results agreed with the reported values within 10%.

Low Temperature Thermal Diffusivity and Conductivity Measurements under an Identical Experimental Setup.