Kirk Cycle Cryogenic Miniature Refrigerator

A Miniature Adiabatic Demagnetization Refrigerator with a Magnetoresistive Heat Switch

We present the design of a novel, miniature ADR with no moving parts, which could be used to cool detectors for astrophysics research, semiconductor analysis, and mass spectrometry. The miniature ADR relies on the development of a magnetoresistive heat switch. We present measurements of the thermal conductivity of a single-crystal tungsten heat switch at temperatures below 4 K and magnetic fiel...

Fixed-point Based Hierarchical MPC Control Design For a Cryogenic Refrigerator

In this paper, a simple and general hierarchical control framework is proposed and validated through the interconnection of the Joule-Thompson and the Brayton cycle stages of a cryogenic refrigerator. The proposed framework enables to handle the case of destabilizing interconnections through state and/or control signals (which is the case of the cryogenic refrigerator example). Moreover, it off...

Kirk Pak

T H E U C I U N D E R G R A D U A T E R E S E A R C H J O U R N A L F a c u l t y M e n t o r s

Comparison of two models of a Double Inlet Miniature Pulse Tube Refrigerator – Part B : Electrical Analogy

The design of a Double Inlet Pulse Tube Refrigerator is investigated by means of an analogy with an electric circuit. The results obtained with the electric scheme are compared with both those of the thermodynamic model (Part A) and experiments. The basic formulation of equivalent electronic components is discussed and a few improvements are proposed to adjust the theoretical expressions of the...

Design and Calculation an a Miniature High-Pressure Compressor Used in Closed Throttle Refrigerator