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Heat capacity and thermal relaxation of bulk helium very near the lambda pointIn October 1992 a low temperature experiment was flown on the Space Shuttle in low Earth orbit. The objective of the mission was to measure the heat capacity and thermal conductivity of helium very close to the lambda point with the smearing effect of gravity removed. We report preliminary results from the experiment, and compare them with related measurements performed on the ground. The sample was s sphere of helium 3.5 cm in diameter contained within a copper calorimeter of vey high thermal conductivity. The calorimeter was attached to a pair of high resolution paramagnetic salt thermometers with noise levels in the 10(exp -10) K range and suspended from a high stability thermal isolation system. During the mission we found that the resolution of the thermometers was degraded somewhat due to the impact of charged particles. This effect limited the useful resolution of the measurements to about two nanokelvins from the lambda point. The results reported here are limited to about ten nanokelvins from the transition.
Document ID
19950007794
Document Type
Conference Paper
Authors
Lipa, John A. (Stanford Univ. CA., United States)
Swanson, D. R. (Stanford Univ. CA., United States)
Nissen, J. A. (Stanford Univ. CA., United States)
Chui, T. C. P. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1994
Publication Information
Publication: NASA. Marshall Space Flight Center, Joint Launch + One Year Science Review of USML-1 and USMP-1 with the Microgravity Measurement Group
Subject Category
INORGANIC AND PHYSICAL CHEMISTRY
Funding Number(s)
CONTRACT_GRANT: JPL-957448
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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