Compressional Cooling of He-3 to Millidegree Temperatures

被引：17

作者：

Johnson, R. T. ^{[1
]}

Wheatley, J. C. ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 1970年 / 2卷 / 3-4期

关键词：

D O I：

10.1007/BF00652512

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A study of adiabatic compressional cooling of a two-phase mixture of solid and liquid He-3 has been made. Details of the experimental arrangement are given. Using a flexible elastic low temperature He-3 a cell that is compressed by liquid He-4 and precooled by a continuously operating dilution refrigerator, cooling to below 2 m degrees K was obtained from starting temperatures near 20 m degrees K. Frictional heating is remarkably low. Calculations are presented which investigate the fraction of solid formed and which suggest rather long thermal equilibrium times in the solid He-3 a nuclear spin system. Application of the method to the production of bulk polarized He-3 nuclei is discussed.

引用

页码：423 / 448

页数：26

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