Faculty Advisor

Jasperson, Stephen N.

Faculty Advisor

Lew Yan Voon, Lok C.

Faculty Advisor

Looft, Fred J.

Abstract

This project concerns the design and optimization of a novel multi-stage continuous adiabatic demagnetization refrigerator (CADR) with cooling capability at cryogenic temperatures. The CADR is intended for use in space astronomy missions with large infrared and x-ray detector arrays that require refrigeration down to 50 mK and power dissipation of as much as 10 [mu]W. A desired feature is the ability for the CADR device to reject heat to a mechanical cryocooler, operating in the 6-10 K range. Theoretical concerns involved in CADR operation are discussed. Design and optimization of the thermal busses, salt growth, and the new liquid helium gap heat switch and the new magnetostrictive mechanical heat switch are presented. Computer programs for providing control of the individual components of the CADR were written, and a two-stage CADR prototype was assembled to test experimental performance against theoretical predictions. Results of these tests are reported.

Publisher

Worcester Polytechnic Institute

Date Accepted

January 1999

Major

Physics

Project Type

Major Qualifying Project

Accessibility

Restricted-WPI community only

Advisor Department

Physics

Advisor Department

Electrical and Computer Engineering

Advisor Program

Physics

Advisor Program

Electrical and Computer Engineering

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