Date of Award

12-2008

Degree Name

Master of Arts

Department

Physics

First Advisor

Clement Burns

Second Advisor

Lisa Paulius

Third Advisor

Asghar Kayani

Access Setting

Masters Thesis-Campus Only

Abstract

Low temperature research requires the use of very specialized equipment to achieve temperatures in the milli- or microkelvin range. Dilution refrigeration has become the work horse of the low temperature research and is the standard technique for cooling below 1 Kelvin. However, the most common techniques involving dilution refrigeration require the use a copious amounts of liquid helium to pre-cool the circulating 3He and an inner vacuum can. Although other "dry" dilution refrigerators are available commercially, this paper will try to describe the building of a new design of refrigerator that incorporates a pulse-tube refrigerator, a 3He evaporation cryostat, and a ^e/^He dilution refrigerator. This will be a closed-cycle system, thus minimizing the requirement of cryogen liquids, making the entire system better suited to certain experimental situations.

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