Adventures of Archibald Higgins. The back hole by Petit J.-P.

By Petit J.-P.

In his most up-to-date event, Archibald Higgins investigates techniques of house and time.

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Qualification of a 4 K Mechanical Cooler for Space Applications,” Cryocoolers 8, R. G. , Plenum Press, New York (1995), pp. 525-536. 30. Bradshaw, T. , “Life Test and Performance Testing of a 4 K Cooler for Space Qualifications,” to be presented at ICCC #10, Monterey, California (26-28 May 1998), paper #73. 31. Johnson, D. , “EMI Performance of the AIRS Cooler and Electronics,” to be presented at ICCC #10, Monterey, California (26-28 May 1998), paper #77. 32. Chan, C. , “IMAS Pulse-Tube Cooler Development and Testing,” to be presented ICCC #10, Monterey, California (26-28 May 1998), paper #104.

CREARE Miniature, Multi-Stage Reverse Brayton Cryocooler— Under BMDO sponsorship, the Air Force Research Laboratory is developing the Miniature, Multi-stage Reverse Brayton Cryocooler (MMRBC) program with Creare, Inc. (Figure 9). 6 Watt at 60 K. Total input power for either cooling requirement is not to exceed 125 Watts and Figure 8. Creare 60 K reverse Brayton . Figure 9. Miniature multi-stage reverse Brayton . 28 GOVERNMENT CRYOCOOLER DEVELOPMENT AND TEST PROGRAMS must demonstrate an operating life in excess of seven years.

The Air Force Research Laboratory is also developing several advanced cryogenic integra- tion technologies that will result in the reduction in current cryogenic system integration penalties and design time. These technologies include the continued development of the Cryogenic Systems Integration Model (CSIM), 60 K and 100 K thermal storage units and heat pipes, cryogenic straps, thermal switches, and development of an Integrated Lightweight Cryogenic Bus (CRYOBUS). INTRODUCTION The use of long-life, active cryocoolers provides a significant improvement to DoD space surveillance and missile tracking missions.

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