Drastic reduction of warm-up rate within a dewar system by helium desorption /

A method is described whereby the time rate of temperature change is drastically reduced within a glass double-dewar system over the interval 4.2 to 77K. The problem of reducing the rate of change is solved successfully by inserting a small amount of activated charcoal in the inner dewar. The explanation of why it succeeds is presented and results are given showing the drastic reduction of warm-up rate for various amounts of charcoal. Some advantages of such a simple scheme are listed. (Author).Solid State Sciences Laboratory Project 5621.Research supported by the Solid State Laboratory, Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, L.G. Hanscom Field, Massachusetts.At head of title: "Research Report."AD0601054 (from http://www.dtic.mil)."January 1964."Includes bibliographical references (page 7).A method is described whereby the time rate of temperature change is drastically reduced within a glass double-dewar system over the interval 4.2 to 77K. The problem of reducing the rate of change is solved successfully by inserting a small amount of activated charcoal in the inner dewar. The explanation of why it succeeds is presented and results are given showing the drastic reduction of warm-up rate for various amounts of charcoal. Some advantages of such a simple scheme are listed. (Author).Mode of access: Internet